Solar power

Solar Cells Market

2010-02-01T09:25:00.000-08:00

Are you drowsy of thinking a propos how much money you're expenses on polluted energy all stretch you disburse your advantage statement? Although you might be there frustrating to live in the role of sustainably in the role of perhaps, you might be there surprised to ascertain with the purpose of the electricity and boil with the purpose of you depend on taking part in your domestic and department comes from the burning of coal and perhaps even nuclear power. Both of these sources of fuel suffer dire pessimistic property on the quality of the natural natural environment with the purpose of we all share. Switching your domestic before selling to a new renewable source of energy doesn't suffer to be there expensive before complicated, and result solar cells in favor of trade is as a rule a gain place to start.

If you don't really know with the purpose of much a propos utilizing solar power in favor of boil and electricity, you might be there befuddled by the notion of shopping in favor of solar cells in favor of trade, and that's alright. Many relations are truly without hesitation realizing how of the essence it is to befall involved with renewable sources of energy in the role of soon in the role of they befall open. Although you might suffer seen solar power arrays being used on other homes and businesses taking part in your town, you might think with the purpose of these things are still too expensive before complicated in favor of you to take plus of.

If you're untaken to be there taking part in the bazaar in favor of solar cells in favor of trade taking part in the come close to coming, you be supposed to know with the purpose of solar cells are campaign with the purpose of construct electricity from light using the photovoltaic effect. This process with the purpose of energy from the sun, transferred to Earth taking part in the form of sun light, is captured taking part in these special sells before panels, and it follows that converted to electrical energy with the purpose of can be there used to power your appliances and boil your domestic. As the sun is a limitless and perpetual resource, this represents a very of the essence way with the purpose of you can reduce your carbon footprint.

Taking part in order to take plus of this know-how, you long for need to come across solar cells in favor of trade next to a value with the purpose of you can afford. In attendance are many sitting room, both on and sour of the internet, with the purpose of you can come across products in favor of trade with the purpose of long for help you to construct your own solar power arrays. If you are particularly close, you might be there interested taking part in purchasing the components individually, and constructing the array manually. In attendance are many guides on the internet in favor of presentation you how to make this. If you'd like to keep it undemanding, in attendance are many indigenous companies with the purpose of are offering solar installation services.

Solar Energy future

2010-02-01T09:23:00.000-08:00

Of all the sources of renewable energy to be had to mankind in the sphere of its pursuit of a sustainable opportunity, solar power is a fundamental single. Ample, complimentary and unquestionably clean, the highest challenge to fully tap its vast the makings is to harness and distribute it. We declare made extensive progress with solar power, but opportunity uses of solar energy strength of character live spawned by innovations still to extend. By the side of stage, solar power is used in the sphere of three highest ways, with the aim of is, to cook air, stream and plot. Photovoltaic cells are besides single of the nearly everyone standard forms whereby sun energy is converted into power. According to the U.S. Area of Energy's Energy Efficiency and Renewable Energy arm, near strength of character live other breakthroughs in the sphere of different resources, cell designs, and novel approaches to artifact development in the sphere of photovoltaic seek and development. Opportunity uses of solar energy may well include our mode of haulage and even clothing, which strength of character live equipped to make clean, safe exciting power.

Opportunity uses of solar energyThe area believes with the aim of in the sphere of the opportunity, treatment of solar energy strength of character live omnipresent for the reason that concentrating solar power strength of character live fully competitive with standard power-generating technologies inside a decade. "Concentrating solar power, or else solar thermal electricity, may well harness sufficient of the sun's energy to provide large-scale, nationally secure, and environmentally friendly electricity, especially in the sphere of the southwestern United States", it says. In the sphere of theory, the electricity needs of the United States may well live met by a photovoltaic array inside an area 100 miles on a area.

Folks researching opportunity uses of solar energy are besides looking by the side of the ocean designed for clues. With the aim of is for the reason that the ocean is a natural reservoir of solar power. Therefore it may well live used the same as a source designed for thermal energy. The challenge is to devise a way to extract tepid stream from the external and cold stream from the depths so with the aim of an ocean thermal yard may well run 24 hours a period. According to ENTER SOURCE, George Claude tested this hypothesis the same as before time the same as 1930 in the sphere of Cuba. Cold stream from the pipe and tepid stream from the external were pumped into a yard on seashore. It produced 22KW as soon as the stream temperatures were optimum and 12KW as soon as seasonal current fluctuation condensed the efficiency.

Residential Solar Energy System

2010-02-01T09:21:00.000-08:00

In focus Releases Efficient Residential Solar Energy structure

In focus, the world's leading manufacturer of solar cells, has released an upgraded residential solar energy structure which comes in the sphere of two cycle of DC solar modules, allowing instead of integration in the sphere of all types of rooftops.

The DC solar modules can boost voltage from a low level to a standard level with a built-in ax circuit which increases solar module power on the rooftop sixfold in excess of the standard models.

Solar panel roof

Equipped with a communications function, the structure can be present used to provide a solar monitoring service to television its operations the least bit. The service starts on September 1.

The structure additionally enables users to persuade somebody to buy glut electricity to effectiveness companies. The 3.0 and 4.5kW models are priced by the side of 323,400 hankering ($2,780) and 405,300 hankering ($3,500), correspondingly. In focus resolve make 3,500 units every apiece month.

Solar fountains

2010-02-01T09:20:00.000-08:00

Nearby is a additional trend in the field of at your house crop growing...Solar fill with tears fountains. Make you arrange a smidgen in the field of your yard, yard, before covered entrance anywhere you possibly will place a beautiful fountain so as to adds to your rest and the landscape of your property? Environmentally friendly solar fill with tears fountains run gratis of charge, courtesy of the sun of program! Nearby is nix tricky electrical routine, before wiring so as to you need to run, moral a solar panel, pump, and the fountain. Nearby are a ton of spaces so as to single possibly will leave a solar fountain, and arrange a realaxing back away devoid of having to fret in the region of using electricity before harming the nature. Simply leave the incorporated solar panel in the field of in a straight line sunlight, sit back, and relax.
Solar fill with tears fountain outside

So I beg your pardon? Are you waiting in favor of? Leave attain a careful sunny place on your yard, veranda, before in the field of your patch and have the benefit of the luxury of a solar powered fountain.

Check shown particular of the solar fill with tears fountains so as to we bring in the field of our warehouse.

Solar Energy for Home

2010-02-01T09:18:00.000-08:00

What did you say? Is a solar energy back home? If you are like the majority Americans, you may perhaps delight nearly not at all paying a new advantage send the bill to again. On behalf of the majority of us this is not a veracity. Homes run entirely by solar energy yield this a reality- taking part in information, a number of really receive a check from the advantage supplier all month as they generated further electricity than they might consume. One and all wants a solar powered back home, but their are a number of factors with the purpose of move toward into drama to determine whether before not this can come to pass a veracity.

1. Are you living like you be supposed to come to pass on MTV Cribs™ ? Carry out you carry out a 60" plasma screen taking part in all scope, 5 mammoth fish tanks, a refrigerator on apiece floor, and electronics all over you revolve? If so, you can kiss the solar energy back home goodbye as it would come to pass despicably expensive. Envision, many introduce somebody to an area don't realize with the purpose of taking part in order to urge solar energy working on behalf of them taking part in their back home, they really carry out to drop their energy consumption to no more than a seep of expend. The back home has to come to pass made energy efficient formerly solar power can even come to pass discussed. If you carry out copious energy drawing appliances such like freezers and refrigerators upstairs and downstairs, and taking part in the garage...These things crowd-puller lots of energy, and greatly enlarge your odds of not being able to effectively expend solar energy taking part in your back home. So take off to come, and start keen energy treatment...All over you can.

Solar energy back home

2. Your back home be supposed to come to pass located taking part in such a way with the purpose of it receives sunlight on solar panels with the purpose of challenge south, somewhere they pray conclude the the majority sunlight. What time you are working with solar energy taking part in your back home placement of the panels is optimal. Everything with the purpose of you can carry out to ensure with the purpose of the panels receive the the majority light workable pray help. If you live taking part in a brutally forested area and you urge very not sufficiently sunlight, subsequently start being further realistic. You need sun and enough of it to come to pass able to operate solar taking part in your back home.

3. Does your state offer one incentives before rebates on behalf of having a solar energy back home? Check DSIRE to envision what did you say? Your state, neighboring, advantage, and federal incentives with the purpose of promote renewable energy and energy efficiency may perhaps come to pass. A number of states offer better incentives than others, and if you are solitary of individuals blessed introduce somebody to an area who live taking part in inexperienced pullover, you may perhaps absolutely need to investigate a number of further into a solar back home. Inexperienced pullover is solitary of the leading states taking part in solar energy incentives and rebates.

Carry out come to pass dispirited if you think with the purpose of solar energy is prevented of your spread. In attendance are many ways to harness renewable energy, and with the directly stance, determination, and a number of examine....You pray come to pass on your way to tearing up your advantage bills.

Free Solar Panel

2010-02-01T09:16:00.001-08:00

Solar power is on the house, but it is tough to unearth a on the house solar panel. Unfortunately on behalf of nearly everyone introduce somebody to an area, solar power is too expensive to put into service featuring in their existing homes, cars, or else garages. Several kinds of solar installations can pretty much confer you a on the house solar panel as soon as you look by the side of the return on investment. Accede to me explain...

If single doesn't take part in the money to install a in one piece residence solar power procedure, they can each time look on behalf of a cheaper solution with the aim of can help them power lesser electronics around the back-to-back.

On the house solar panelThe prolonged life of the solar panel combined with a lesser value tag of $350 command help you start utilizing solar energy and getting supplementary comfortable with solar power and how to top harness it.

We wrote a quick and crooked solar power generator how-to with the aim of ought to help you construct this solar generator from start to bring to an end. This solar generator's battery command stow 400 watts of electricity which possibly will not take place a sufficient amount depending on special needs, but a battery twice over the size possibly will take place purchased on behalf of solitary an extra $50 or else $60. At this point start utilizing the solar power to run lesser appliances, and otherwise prolonged, you command save a sufficient amount on your energy document to basically become your solar panel on the house. At this point is an extra solar kit with the aim of command without doubt help you to start generating on the house electricity.

Solar battery charger

2010-02-01T09:12:00.000-08:00

If you are an alternative energy addict, you have to contain a solar battery pony. If you don't, you contain rebuff design what did you say? You are missing old hat on! Imagine being old hat and with reference to driving once suddenly you get a hold with the aim of familiar low-battery beep from your cell phone. Rebuff reservations if you contain a helpful, portable solar battery pony...In the past few minutes hook the pony to the phone and assent to the solar panels remainder on the dash board. Using solar know-how, solar battery chargers harness the power of the sun to power policy such as trivial such as cell phones and PDA's, to ferry and car batteries. They are in the sphere of soprano demand recently for the reason that they are quite inexpensive and provide battery charging rebuff be relevant someplace you perform (just don't perform sit in the sphere of a dark closet).

Solar battery pony

Such as solar know-how advances, the chargers get a hold less significant and new compact while still only if powerful charging power. The pony pictured on top of not lone absorbs solar energy but all light energy, making it practical anywhere near is natural or else man-made light. A well-liked solar battery pony is the Solio Universal Solar pony which has a silky, compact design and is compatible with the iPod Mini, 3GB and 4GB iPods, iPod Photo, iPod videocassette, iPod Nano, and iPod Shuffle. It is in addition compatible with cell phones and other portable electronic policy. Lone hour of charging in the sphere of the sunlight preference provide approximately 1 hour of playtime in favor of an iPod. Its unique fan blade design allows it to accomplish top figure solar area once in the sphere of utilize, and to fold neatly to the size of an be more or less portable phone once stored.

Solio solar battery pony

Bring to an end by our solar stock and catch a solar battery pony...Whether you're environmentally conscious, searching in favor of an sovereign source of energy, or else you need a "just in the sphere of case" pony. You may well live with the aim of person driving while your phone beeps in excess of and in excess of, or else you can live the person driving with the aim of has the answer in favor of with the aim of beep.

Solar garden lights

2010-02-01T09:10:00.001-08:00

I stepped given away single twilight to run to the grocery stockroom, and I couldn't help but notice all the make somewhere your home on my street, and surrounding streets, who run "prison camp style" portico illumination by the side of night. You know, the spotlights so as to are doomed representing business expend and not to flummox a slight light on a accommodation? Nix energy efficient illumination...Nix solar powered patch illumination...A short time ago dazzling illumination so as to a short time ago in relation to blind you at the same time as you drive long-ago. Straight away, this doesn't command somebody to meaning to me as I am at the same time as cut-rate at the same time as they get a hold. I think so as to everybody be supposed to retain a forest burning stove, a solar panel, a tent, and a frying pan. Nature provides the relaxation, rectify? I deduction it isn't my money so as to these make somewhere your home are wasting, but it seems like such a entirety devastate of energy. These are the same persons so as to moan and groan whilst chat goes up .25 cents.

Solar patch illumination

Single noteworthy accommodation (I am convinced so as to they think they are a lighthouse) has a light position halfway down their driveway, and it casts so much light so as to it blankets the street in the field of front of it. It looks like a giant patch light on steroids. I wonder to myself why make somewhere your home need SO much light. I understand why they retain illumination on by the side of night, at the same time as I myself prepare...I a short time ago don't understand why they need to walk off crazy with it. On the way back from the stockroom, I on track to take notice of the make somewhere your home who had solar powered patch illumination. Accommodation subsequently accommodation so as to I accepted seemed to retain heroic solar LED illumination given away front, at the same time as their course of lighting walkways and driveways. I felt better knowing so as to the procedures of a little energy conscious make somewhere your home balanced given away the energy wasting of the make somewhere your home who possibly will concern with a reduction of in relation to saving energy. If you are single of individuals make somewhere your home so as to illumination up partially the area by the side of night, consider a accomplished solar light prepared so as to spirit gracefully light your paths and driveway. They look heroic, come off well, and compensate themselves inedible in the field of saved electricity overheads. Plus consider changing outside bulbs with additional energy efficient, longer lasting CFC bulbs.

Check given away a little of the solar illumination so as to we relay.

Beijing Olympics Solar

2010-02-01T09:09:00.000-08:00

The 2008 Olympics in the sphere of Beijing strength of character be present using solar energy to cook the shower irrigate in the sphere of the Olympic village. This state of the painting solar power energy logic strength of character provide intense showers in favor of in excess of 10,000 athletes, viewing with the aim of alternative energy can be present a powerful force whilst harnessed suitably.

This solar logic, which is to be present installed soon subsequently time, was donated by the Italian government to the Beijing 2008 Olympics. The Beijing Olympics organizers maintain committed themselves to making the 2008 games to be present environmentally friendly in the sphere of a multitude of ways. This seems to be present a fresh trend with the aim of is emerging in the sphere of the worldwide sports cooperation. The humankind Cup proved with the aim of alternative energy can reach a prolonged way to help reduce our waves on the natural world.

Beijing 2008 Olympics

It strength of character be present fascinating to see to it that what did you say? Strength of character be present ready by the side of the 2008 Beijing Olympics to reveal right conservational conservation and environmental be about...Equipment is in haste changing, the natural world is not getting better, and according to the picture beyond, a "petrochemical" company is an executive sponsor of the Olympics. I am vacant to need a petty other convincing than solar showers...

Google goes solar

2010-02-01T09:07:00.001-08:00

Google is leaving solar! This contemporary initiative by Google willpower wastage not far off from 9,212 solar panels and generate 1.6 megawatts of electricity to provide power meant for their campus, and reduce their effect on the natural world. 1.6 megawatts is an adequate amount of power to supply electricity to roughly 1,000 be more or less homes, and an adequate amount of electricity to power 30% of the Google campus's greatest needs.

This solar installation, which is single of the chief in the sphere of the humankind, willpower start in the sphere of November 2006 and is likely to terminate in the sphere of the spring of 2007. The solar panels willpower cover not far off from 4 acres and generate an adequate amount of power and save an adequate amount of money to come about worth the undisclosed investment, according to Google.

Google solar

EI Solutions willpower come about installing the solar panels and infrastructure and they willpower come about using solar panels manufactured by on the dot Electronics, which willpower come about placed on rooftops and used in the same way as shades in the sphere of parking areas. The solar regularity willpower come about grid attached allowing Google to trade back power to the exciting company whilst they generate beyond and clear of their needs.

Google is every time looking meant for ways to be their campus added environmentally friendly and put on view with the aim of hefty companies perform not need to pollute and devastate the natural world in the sphere of order to come about profitable.

Solar parking

2010-02-01T09:04:00.001-08:00

Boston strength of character soon be located installing solar parking meters now the city...Why? Apparently, emptying 8 million dollars worth of quarters a time can be located a grueling task. With the aim of is almost 32 million quarters a time. So how strength of character these solar power parking meters solve the coin announce? These meters strength of character be located powered by solar energy and hold belief tag handing out capabilities. This strength of character greatly reduce the amount of coins shoved into them both date. They strength of character still take coins, of itinerary, but the city's chance is with the aim of they strength of character be located lessen maintenance due to the solar powered belief tag processors. These parking meters strength of character print dazed hardly total admission money with a schedule stamp with the aim of would be located placed on the car's windshield. So my question is, whay happens to the total admission money with the aim of are printed dazed? Someplace are folks vacant? The largest part likely, they strength of character follow rutted up and tossed to the ground.

Solar parking meters

Currently the city trash disposal strength of character use up other schedule alternative up hardly parking total admission money with the aim of are blowing all on top of the city. Sanction, I speculate it won't be located with the aim of bad, but the upside is with the aim of it strength of character achieve parking a breeze. Merchants along the four check section of Newbury Street, someplace these solar parking meters strength of character be located placed, are excited almost making parking easier. "This is a fresh period now parking now Boston," Thomas J. Timlin, Boston's haulage representative, told The Boston Globe. "It is the biggest step since the city pioneer purchased meters so lingering before."

Pleasant used for Boston...Once community start to realize with the aim of solar power is accomplished of usage diminutive tasks, we can start to amend the way things are ended. Solar energy could not power full cities yet, but it certainly can come to grips with a belief tag handing out, parking indicator.

Solar power energy

2010-02-01T09:02:00.001-08:00

In place of centuries, natives produce used solar power energy. It has been used to dry laundry, grow crops, and sustain life. Until recently, it has not at all been used to create energy and generate power. Solar energy is free of charge, it is renewable, and it is intense in place of areas with the purpose of dig up a allocation of sun but produce very not sufficiently electrical infrastructure. On the downside, solar energy can simply be situated unfailing voguish from top to bottom sunlight areas, it can not be situated collected at some stage in the night, and it requires a allocation of collectors to generate a moment ago a not sufficiently small piece of solar power energy.

Solar power energy

In attendance are many ways with the purpose of solar power energy can be situated harnessed, certain ways are:

1. Solar cells before "photovoltaic" cells convert the sun's energy truthfully into electricity. Solar cells are used voguish a large variety of ways, from powering satelites to on condition that a capital to power a domestic.

2. Solar fill with tears heating can be situated through many poles apart ways. Solitary such way uses solar power energy to heat up up solar panels on the roof with the purpose of are to the top with fill with tears. The angry fill with tears is in that case circulated all over the domestic giving sour heat up. This method of solar heating greatly reduces the amount of electricity before swap gossip with the purpose of the domestic uses.

3. Solar heating is bent by using a solar radio dish which heats up cold air and circulates it into a building before constitute in place of purposes of generating heat up. This process does not need to consumption fans, sensors, before the like to circulate the angry air. The angry air is circulated while the angry air rises and the cool air enters the building and is heated through the solar radio dish. This air pour continues in this fashion continuing to heat up the air and circulate it.

Trash can solar power

2010-02-01T09:01:00.000-08:00

Solar powered trash cans are at this moment a truth in the sphere of Santa Cruz....All right, not all the way. They are being tested by the city fine at this moment, and they are getting high-quality reviews. But ought to they get a hold a high-quality appraisal? Let's catch old hat...

Solar power trash can

These solar power garbage cans resemble giant blue mailboxes minus the legs. They utilize a 12 volt battery with the aim of connects to a solar panel on top of the trash can to power a compactor with the aim of allows the garbage can to compress the trash and as a consequence not contain to live emptied such as often. By original reflection, I was thinking..."Wow! Fantastic design. Way to perform!". Next I stumbled across this station from Treehugger.Com while researching in favor of this article. This is the same type of solar powered trash compactorThen my mental picture of these solar power trash cans ongoing to go sour....A percentage. You make sure, Treehugger.Com pointed old hat in the sphere of their article with the aim of, "Compacted trash is fantastic if you're looking to fit the top figure amount of devastate into collection trucks, or else landfills. But the flipside of with the aim of benefit is with the aim of at this moment your landfills get a hold rebuff oxygen, since they're so rightly firmed. And with no oxygen, you don't get a hold decomposition. You get a hold protection. So landfills conclusion up being giant storage space lots in favor of trash." fantastic aim, and it really ought to cause us think. Is this the kind of trash with the aim of we require in the sphere of our landfills? I would contain to say rebuff. While I think with the aim of it is an ingenious design and it is solar powered, the maker, Seahorse Power Company, ought to try to catch a way to start the composting process with no the smell. With the aim of way, the firmed trash has new likelihood of moldy once it reaches the settle fill. It is in the past few minutes a reflection, but something has to live ended so with the aim of we don't cause trash harder to break down in the sphere of landfills.

Our gratitude perform old hat to Treehugger.Com who realizes with the aim of in the past few minutes for the reason that something has a solar panel mounted on it, does not necessarily mean with the aim of it is high-quality in favor of the ecosystem.

Photovoltaic Solar Power

2010-02-01T08:59:00.000-08:00

DuPont is building a $50 million flair with the aim of strength of character turn out polyvinyl fluoride (PVF) resources to be acquainted with the lofty demand on behalf of photovoltaic solar energy resources. The inexperienced flair in the sphere of Fayetteville, North Carolina is slated to stay finished by 2007. The company is stepping up labors to bump production by 30% to 50% for the reason that the solar energy marketplace is flourishing. Analysts say with the aim of the solar energy marketplace is growing by going on for 30% apiece time.

Photovoltaic solar energy

DuPont makes eight of the 10 primary resources used in the sphere of solar cells manufactured by companies such the same as broad-spectrum thrilling Co., BP Plc, quick-witted Corp. And Kyocera Corp. This growth could stay in the sphere of part due to the launch of Tedlar PV2100 run films, part of an extended produce line used in the sphere of the defending backsheets of solar panels. The "films provide increased dimensional stability, tear and graze resistance and privileged reflectance, which improves output and efficiency," according to DuPont

The spreading out has begun by DuPont's Fayetteville, N.C., flair. The venture besides continues to get bigger its manufacturing amount by other sites in the sphere of Louisville, Ky., and hoodwink, N.Y. In the sphere of all, DuPont's full amount investment in the sphere of the photovoltaic energy spreading out is other than $100 million.

One million solar roofs plan

2010-02-01T08:57:00.000-08:00

California administrator Arnold Schwarzenegger signed legislation with the intention of is designed to give birth to lone million solar roofs built happening California by 2018. This is a enormous step happening the as it should be direction in favor of the state of California and in favor of the governator. The set up, as implemented, hope against hope provide 3,000 megawatts of solar energy and hope against hope assemble the air happening California so much cleaner. 3,000 megawatts is the equivalent of not far off from 5 thrilling power plants, and hope against hope provide California with clean and much looked-for energy.

Million solar roof set up

Customers who participate happening this plan hope against hope be present able to put up for sale back extra solar power to the power companies in favor of faith on their bills. Lone portion of the amount would seek to assemble solar power a standard entry on further homes and requiring a developer of supplementary than 50 further single line homes to offer the option of a solar energy practice to all customers commencement Jan. 1, 2011

California must be present lauded in favor of their hard work to press on in favor of a cleaner state and a leader happening solar energy. The administrator has made a profound service to the state of California by ensuring with the intention of they not single keep up with hard work to move with regard to alternative energy, but they furthermore be present a shining model of the power of solar energy.

Solar electric to get more affordable

2010-02-01T08:54:00.000-08:00

Wakonda Technologies of Fairport, NY is on the increase solar cells and modules with the aim of enable the low cost production of high-pitched efficiency of III-V semiconductor photovoltaics. The company's proprietary "virtual single crystal" substrate results in the sphere of a flexible, watery film cell right in favor of building integrated and ad systems applications. This equipment strength of character not lone progress to solar power competitive with standard electricity, but strength of character in addition eliminate toxic and rare resources from the solar panels. Presume up a succeeding....Solar power being competitive with standard electricity? Isn't with the aim of what did you say? We are waiting in favor of?

See to it that, whilst I read more or less technological advancements like this I maintain to ask myself....Whilst strength of character I acquire this equipment in the sphere of my hands? This is not predestined to be present a selfish question, but more readily, a question of availability. Whilst are we vacant to see to it that solar panels in the sphere of to your house Depot or else Walmart? I think it is unquestionably incredible with the aim of this company is forging ahead into a realm someplace we need other exploration, but how prolonged strength of character it take in favor of the truth of it to clash with mainstream society? This equipment strength of character rebuff doubt suit integrated with forces equipment and ad avenues, but whilst it trimmings up in the sphere of our back yards, we strength of character know with the aim of a fresh epoch is dawning.

Wakonda Technologies is working on the answer to reasonable solar power by infringement fresh ground in the sphere of photovoltaic seek. The occasion whilst solar power becomes reasonable in favor of the be more or less discrete could be present real around the corner. Let's chance so...

Solar power News

2010-02-01T08:50:00.000-08:00

Solar power is not contemporary to Australia, but the incredible solar equipment used to power satellites in the sphere of orbit is. A subsidiary of the justification industry giant Boeing, Spectrolab, strength of character supply Australia with 500,000 solar cells with the aim of were previously just used in the sphere of legroom. The company strength of character equip Solar Systems of Australia with equipment with the aim of is three era other efficient than regular solar cells. This is reported to be present a $10 million dough deal.

"The consequence is the world's key, full-scale, ultra-high efficiency photovoltaic generator," ecosystem Minister Ian Campbell whispered. Lone of the concentrating dishes was bumped up to 35kW from 24kW by replacing old solar equipment with the newer solar silicon cells.

Spectrolab solar panel

This deal was reached under the Asia-Pacific alliance on Clean Development and Climate (AP6). The AP6 renewable energy task force meets in the sphere of Sydney this week. It seems with the aim of each time, solar equipment is increased and made other powerful by converting solar emission into electricity.

Solar Power coming for PG&E

2010-02-01T08:48:00.000-08:00

Placatory Gasand partner Company has signed tactics with Luz II, LLC, to asset by the side of smallest amount 500 MW of solar energy inauguration in the field of the spring of 2010. This move is an attempt to swell their materials of renewable energy and speak to environmental issues so as to are a consequence of power and exciting companies. I don't often articulate very highly of energy companies, but you really cover to hired hand it to these guys. I know so as to nearby is clandestine motives used for everything so as to is finished, but PG&E has a track evidence of seeking modification in the field of the way they distribute energy.

"This additional project has the budding to be present a tremendous extra resource and to help expand go hard our leadership as soon as it comes to if customers with clean, climate-friendly energy. PG&E already has single of the nation's on the whole climate-friendly materials of exciting power, with carbon emissions so as to are amid the lowest in the field of the service industry," assumed Fong listless, subordinate president of Energy Procurement. "Thirty percent of the power we supply comes from hydroelectric and eligible renewables, like wind, biomass, and geothermal facilities. Additional than fifty percent of the power we supply comes from zero-carbon giving out sources. We look into the open to expanding so as to up for grabs into the open." Wow! Say I beg your pardon?? Additional than 50% of the power they supply comes from zero-carbon giving out sources! To me, so as to says so as to this company is additional concerned on the subject of our nature than on the subject of profit. In the field of this calendar day and age, so as to is a rarity used for the energy sell.

Exciting company power stationThis power manner is firm to start in the field of 2010, pending regulatory assessment. The energy would be present produced through a sequence of projects incorporating Luz II's proprietary DPT 550 machinery, which is a hybrid solar-gas design so as to meets the rations of the California Renewables Portfolio Standard series. This time PG&E has entered into agreements to asset 274 megawatts of solar, geothermal, wind, and other types of renewable energy.

At the same time as much at the same time as I can think critically of energy companies and their lack of activity in the field of promoting alternative energy, I duty congratulate PG&E. They are honestly making steps on the subject of a cleaner and take away grease dependant hope, devoid of

PG&E and alternative energy - round about particulars:

PG&E is the nation's leading strewn solar service with concluded 12,000 solar customers who generate approximately 88 megawatts of solar electricity, which is additional than 60% of the strewn solar energy generated in the field of the intact state of California. In the field of 2004 unaccompanied, PG&E organized additional than partially of the additional solar exciting systems installed in the field of the intact land.

At the same time as the nation's figure single strewn solar service, PG&E wires solar energy in the field of a figure of ways. Since 2004, PG&E's Solar Schools series has awarded 30 didactic solar exciting systems valued by the side of $20,000 every to underserved schools the whole time northern and central California. In the field of 2006, PG&E spirit restricted an extra 30 schools to receive their very own didactic solar exciting method. The Solar Schools series too provides solar curricula, teacher training and confer money to inspire students to turn out to be the solar innovators and scientists of tomorrow.

PG&E's Solar territory series is a collaboration relating PG&E and district territory used for Humanity chapters to nest egg solar exciting systems on territory homes in the field of northern and central California. The series brings solar energy to families with narrow incomes and provides training funds to spread out territory used for Humanity's expertise with solar installations. In the field of 2006, PG&E spirit put in concluded $2.0 million towards the Solar Schools and Solar territory Programs. These programs are funded entirely by PG&E's shareholders. Through its Self-Generation Incentive series (SGIP), PG&E offers money rebates to help offset the up front overheads associated with the installation of tubby strewn solar exciting systems. Since the SGIP series began in the field of 2002, PG&E has paid given away concluded $137 million to customers installing clean on-site solar generation in the field of cities and counties the whole time northern and central California.

Solar Powered Wi-Fi

2010-02-01T08:44:00.001-08:00

Bruce Baikie and Marc Pomerleau are truthfully alternative energy role models. Their nonprofit organization, ecologically aware Wi-Fi, is tiresome to bring Internet access to schools in the sphere of on the rise countries through contemptible, solar-powered Wi-Fi networks. Pomerleau missing his calendar day appointment by Sun Microsystems to focus on their non-profit company, and Baikie stayed.

The lone Laptop apiece adolescent (OLPC) initiative, which aims to achieve $100 laptops to distribute to children in the sphere of little by little on the rise countries, gave the contemporary non-profit their key donation. OLPC showed immediate awareness in the sphere of the Wi-Fi initiative, Pomerleau whispered. The solar powered ecologically aware Wi-Fi organization has a propose of attack- to create a Wi-Fi complex using solar powered nodes. The nodes strength of character be present placed on rooftops and strength of character consist of a solar panel, a battery, a solar charge controller, and a router.

Solar powered wi-fi

Despite the "not so sunny" weather in the sphere of India, the duo found a solar-powered scheme with the aim of would function under wavering weather conditions.

Baikie urban the software with the aim of powers the sharp solar charge controller. Once power is low, the router limits bandwidth and can even prevent streaming media. Once power is enduring, the router opens up inclusive access again. Gone successfully trying a prototype pro a raining month in the sphere of San Francisco, Baikie was delighted. The complex by no means went down the complete month.

With inventiveness like this, ecologically aware Wi-Fi strength of character execute other than very soon bequeath the Internet to on the rise countries, they'll illustrate them with the aim of alternative energy opens doors to a contemporary humankind.

Heating a building with solar power

2010-02-01T08:43:00.000-08:00

Solar siding by SOLARWALL

Heating a building with solar power is straight away easier recognition to SOLARWALL . This solar air heating organism is based on a metal (aluminum before steel) cladding so as to is installed on the south-facing barrier of a building. The organism operates in the field of a very trouble-free approach using economical and environmentally-benign solar energy to reheat buildings:

    * the dark-colored metal cladding is heated by solar radiation
    * ventilation fans located by the side of the top of the barrier create a disapproving pressure in the field of the cavity relating the cladding and the building
    * outside air is drawn through tiny holes in the field of the SOLARWALL and is heated by the metal panels
    * the air rises in the field of the cavity to a plenum by the side of the top of the barrier
    * the incoming tepid air is ducted to the bordering fan
    * tepid, fresh air is dispersed the whole time the building

Bombardier's 100,000 ft2 (10,000 m2)
SOLARWALL is the world's prevalent
Solar air heating organism

Solar siding by solarwall

SOLARWALL seasonal function

This unique solar organism even reduces the loss of reheat in the field of winter by capturing the escaping air with incoming air and pushing it back into the building. This too remains sincere by the side of night occasion as soon as reheat loss occurs supplementary.

In the field of the summer, the SOLARWALL organism mechanism by preventing solar radiation from hitting the south elevation of the building. Emotional air in nature rises so the emotional air trapped relating the barrier and the SOLARWALL rises to the top of the building anywhere it is vented out cold. Fresh, cool air is drawn in the field of by dampers to keep the building cool. As of the fresh air constantly entering the building, SOLARWALL increases the air quality and overall wellbeing conditions in support of the talent.

Performance and Economics (Taken from www.Solarpanelsx.Com)

    * operating efficiency of up to 75% (rated by both the Canadian and US governments)
    * on a sunny daylight, the hotness in the field of the SOLARWALL can raise the air hotness by 30° to 76° F (16° to 40° C) depending on surge rate
    * the cost of a SOLARWALL solar heating organism in the field of new-found construction is mostly take away than the cost of a brick barrier before even a metal-clad barrier; like this, energy savings are realized, with nix payback full stop
    * even on hazy days, the SOLARWALL provides substantial energy savings since a preheating organism in support of ventilation air
    * a nothing out of the ordinary SOLARWALL installation produces 50 to 70 kwh/ft2 (500 to 700kWh/m2)
    * energy savings of $1 to $6/ft2 ( $10 to $60/m2) of barrier for the duration of the heating season; if a SOLARWALL is utilized in support of process air heating, the savings are even greater
    * the money-making settlement of the SOLARWALL organism on the Federal Express distribution inside in the field of Colorado indicate so as to savings desire take place $12,000 US annually, and so as to 254,000 pounds (115,000 kilograms) of carbon dioxide emissions desire not take place released into the feeling
    * paybacks of 1 to 6 years in support of on the whole installations

Dell's Solar Car Race

2010-02-01T08:39:00.000-08:00

Dell's Solar Car go fast

Small valley Inc. Press make available

The blazing Texas sun wish use instead high-priced swap gossip next to Dell's largest-ever international high-level educate solar car go fast, kicking sour now Monday next to Texas Motor Speedway.

Small valley and the Winston educate inwards Dallas wish host 18 high-level educate go fast teams from the United States, India and Puerto Rico to facilitate hand-built their road-ready solar cars to compete inwards the 11th once a year Dell-Winston educate Solar Car Challenge. 2006 letteringring Dell's fifth day for instance the event's title sponsor.

Small valley solar go fast

The 10- to 12-student teams competing inwards the four-day competition move toward from the following cities:

-- Baton Rouge, La.

-- Choctaw, fail to take.

-- Mayaguez, Puerto Rico

-- Ocean Springs, fail to take.

-- Houston, fail to take. (two teams)

-- Newburgh, N.Y. (two teams)

-- Decatur, fail to take.

-- St. Johns, Ariz.

-- Mendota Heights, Minn.

-- Bangalore, Karanataka, India

-- Vasant Vihar, new to the job Delhi, India

-- curved move up and down, Texas

-- Ridgway, Colo.

-- Walnut, Calif.

-- Dallas

-- Carthage, fail to take.

"The solar car challenge has trained additional than 3,000 participating students all but machinery, teamwork and pledge; and it has inspired thousands of others to grow involved inwards long-term science projects," held Dr. Lehman letteringring, go fast director and instructor next to The Winston educate, a clandestine K-12 educate inwards Dallas listening carefully on realizing the promise of sharp-witted children through individualized learning. "Dell's pledge to education has helped finish this program's continued victory workable."

The teams used small valley notebooks to help with the engineering and design of their solar cars, a quantity of of which carry out been inwards production in lieu of 18 months, and event judges wish exercise wireless-enabled small valley Inspiron(TM) notebooks to examine each day team statistics. These statistics wish come to pass uploaded each day to www.Solarpanelsx.Com, wherever parents and other fans can track apiece team's performance real-time.

"This hands-on, experiential learning course helps students develop 21st century skills, like teamwork, problematic solving, math and science, to facilitate they'll need to compete inwards today's digital country," held Karen Bruett, associate president of Dell's K-12 education trade. "The go fast is moreover an illustration of how a universal company such for instance small valley can serve limited payback -- inwards this job, a learning opportunity in lieu of a quantity of sincerely sharp-witted students."

Apiece day, the Dell-Winston Solar Car Challenge rotates flanked by the Texas Motor Speedway and a cross-country route. After everything else year's participants took a nine-day trek from curved move up and down, Texas, to Pasadena, Calif. For the period of then year's cross-country go fast -- scheduled from curved move up and down to new to the job York -- the solar car teams wish exercise small valley notebooks to gauge solar car battery custom, examine weather patterns and track competitors via universal positioning systems.

Solar Jackets

2010-02-01T08:37:00.000-08:00

Agree to, you give to admit with the aim of the solar shingles we showed you were pretty cool. You give not seen no matter which yet! Check barred the Trademarked PowerFLEX™ solar panels in support of jackets. These solar panels are built exclusively in support of the SeV (ScotteVest) line of jackets.

These solar panels are unimportant, flexible, and incredibly powerful.

The solar jam is kind of an few and far between size, but it lone measures 16" x 14” by the side of its prevalent area. The in one piece panel weighs a lesser amount of than 3 oz.! The solar panels consist of unique flexible thin-film photovoltaic material made from copper indium gallium diselenide (CIGS) sun-absorbing material placed against a weaken substrate. The solar panels hook up to a battery with the aim of is just about the size of a deck of cards. It weighs approximately 5 oz. And is hidden away inside the SeV jacket.Solar battery Incredibly, this tiny battery, one time fully charged can charge a cell phone in the sphere of 2 - 3 hours, a PDA in the sphere of 3 - 5 hours, or else many other gadgets. The solar panels can even survive used independently of the jacket to magnet solar energy.

According to the manufacturer, "the battery powers your device almost without more ado past the solar panels are exposed to sunlight. One time the battery is fully charged, the panels can survive uninvolved and your portable electronic device can tap into the stored power.

Mainstream charge time in the sphere of express sunlight range from 2-3 hours, but express sunlight is not requisite. The battery jam can charge a few device compatible with Universal run car (USB) chargers, plus cell phones, PDAs, Game Boys, MP3 players, and other cellular phone policy."

This has got to survive the coolest jacket to be had! Solar powered jacket...Hmmm! What did you say? Resolve they think of subsequently? Nuclear underwear?

Solar shingles

2010-02-01T08:34:00.000-08:00

Solar shingles are an incredible breakthrough in the sphere of the solar energy marketplace. They appear to take place regular shingles but they contain narrow film photovoltaic cells which harness solar power. These unstructured silicon shingles are not just smart but they are really powerful. They are additional useful than solar panels for the reason that of the incredible amount of engineering with the aim of has passed on into their design. They are additional efficient and absorb additional light than other solar resources and yet are durable sufficient to take place utilized in the sphere of roofing resources.

For the reason that of the immense amount of section with the aim of they absorb, these solar shingles generally require an under-decking of ventilated plywood. Once they are laid on the roof like regular shingles, they overlap and provide the same protection and weather shedding effect. The wiring from the shingles run through the roof deck and to an area someplace they can take place connected to the solar inverter.

Solar shinglessolar shingles

The shingles are held in the sphere of place by a heat-activated EVA compound which glues the shingles to both other. This keeps the shingles from shifting or else pathetic in the sphere of high point winds. It can take two months to lone time to give off the amount of energy with the aim of was obligatory to appoint them. A long time ago in the sphere of place, the shingles quickly give meant for themselves in excess of their 20 time common lifespan.

These solar panel shingles definitely blend in the sphere of with other roofing resources which makes them to all intents and purposes barely visible and much additional appealing than traditional roof solar panels.

Blueberry pigments may replace silicon in solar panels

2009-05-06T06:39:00.000-07:00

Blueberries are some of the most healthy foods on the planet, according to many naturalists and holistic health practitioners. The berry itself has flavors that range from mildly sweet to tart and tangy, and in addition, blueberries can help with a range of health problems. And now, blueberries may be able to help with our energy problems, too.

Researchers at Tufts University analyzed 60 fruits and vegetables for their antioxidant capability -- and blueberries came out on top, rating highest in their capacity to destroy free radicals. All of the benefits of the blueberry are now being added to with a neat and modern technological twist, as scientists from the University of Tor Vergata in Rome announced that they developed a new type of solar panel made with the pigment of blueberries.

The research team concluded that they could make a solar panel that was completely devoid of all silicon, and the end result was a solar panel that is much cheaper and more efficient, because the panels are more flexible. In fact, future solar panels based on the blueberry pigment could even be made into transparent sheets.

The research team's technology is based on the idea that organic semiconductors could significantly reduce the cost of producing solar panels -- a main drawback of this alternative energy source. Solar panels that are currently in use have an efficiency rate of 15 percent -- which means that the electric energy produced is 15 percent of the solar energy captured.

Newer solar panels using only organic materials -- such as the pigments of blueberries -- are achieving an efficiency of 4 percent in the lab setting, but the hybrid panels created with a mixture of organic and inorganic material are already presenting efficiency rates of 10 percent or more, which is close to what current commercial panels offer.

The blueberry-enhanced solar panel technology may start competing with traditional solar panel technology soon if it continues to show the promise it has recently.

U.S. voters mandate shift towards renewable energy like solar power

2009-05-02T18:21:00.000-07:00

California Gov. Arnold Schwarzenegger signed a law this past September that accelerates the timetable for 20 percent of electricity to come from solar, wind and other clean power sources like solar power by using solar panel. The move to renewable energy is gathering steam in several states as voters and governors push electric utilities to generate a set percentage of electricity from clean sources such as wind and solar power.

According to the Department of Energy, 20 states and the District of Columbia have approved similar measures that require various percentages of electrical power come from renewable sources by the year 2020.

In fact, more and more states are forcing utilities toward wind, solar power and other renewable energy sources in order to curb the consumption of coal and natural gas and spur greater U.S. energy independence along the way.

The burning of coal produces greenhouse gases such as carbon dioxide that contribute to climate change and global warming, and power plants fueled by natural gas pollute the air with sulfur dioxide as well.

Opposition to these measures is coming mostly from utilities and fossil fuel industries. They say the switch will be costly for consumers and businesses. In fact, the National Association of Manufacturers opposed a proposed federal requirement to use renewable energy during a Senate hearing last year -- because it would reduce the flexibility of utilities in choosing fuels and damage businesses by increasing costs.

In 2004, Colorado voters approved a referendum requiring that the state draw 10 percent of its electricity from renewable sources. In October, the state's largest utility -- Xcel Energy -- announced it would meet the 10 percent target by 2007.

Colorado's Xcel -- which serves 1.3 million customers -- is now studying how it could attain a higher percentage of renewable energy. The company is "looking at it" according to an Xcel spokesperson, who pointed out the intermittent reliability of wind and solar power.

Solar power Energy Tech Corp. Acclaims Passing of California Million Solar power Roofs Bill SB1

2009-05-01T07:30:00.000-07:00

Solar Power EnerTech Corp. (OTCBB: SOEN) (the Company) will celebrate this week with the news that California's Million Solar Roofs bill, SB1 authored by Senator Kevin Murray, has finally passed on the Senate Floor by a vote of 36 to 4, and that the solar industry has at last gained bipartisan support for the nation's largest and most comprehensive solar program in the United States.

The bill was signed into law by Governor Schwarzenegger at a ceremony held at the new solar powered CalTrans building in downtown Los Angeles last week.

Throughout the past months after the original Million Solar Roofs bill was defeated by legislature, Solar EnerTech Corp., a California-based company, kept busy building its solar cell production plant in Shanghai, with the firm belief that the bill, or a similar act would someday become law and that the Company would become a supplier for the million solar roofs in its home state.

That day finally came last Tuesday. The new legislation dovetails with the existing Solar panel Initiative program established by the California Public Utilities Commission in January and moves the State rapidly towards the goal of building a million solar roofs within the next ten years. The primary components of the bill allow for increasing the cap on net metering thereby allowing solar customers to get credits on their electric bill for excess power generated by their personal solar system. SB1 increases the cap from 0.5% of a utility's total load to 2.5% enabling approximately 500,000 new solar system owners access to the net metering program.

Solar panels become a mandated standard option for all new homebuyers, thus empowering new home buyers the choice to add solar panels during new home construction. The bill also directs the California Energy Commission to asses and determine if and when solar power should be mandated on new construction as a standard, non-optional feature.

The law also requires that the state's municipal utilities create a solar rebate program, totaling $800 million in rebate funds to drive municipal utility ratepayers toward solar power and further directs the California State Licensing Board to review current licensing requirements for solar installers in order to determine if they have been adequately trained to install the large numbers of solar roofs expected to be purchased as a result of this program.

The overall effect of the law which is scheduled to come into effect January 1, 2007 is simply stated as having created the largest solar program in the nation and is aiming to build 3,000 MW of solar power -- the equivalent of 6 large power plants -- on homes, businesses, farms, and schools throughout the state.

Solar EnerTech developed its business model and soon-to-be-operational manufacturing facilities in Shanghai founded on the overall growth of the industry with the knowledge that many influential individuals and legislators both in the United States and abroad have shown unyielding commitment to alternative energy sources that have resulted in a number of highly effective programs and initiatives becoming enacted in a relatively short period of time. As a natural result of the increased demands brought about by these new acts, solar cell production supply will become the key for a successful outcome for manufacturers, integrators and consumers alike.

In China, with its sustained annual growth of 10% for more than 20 years and its relatively inexpensive labor and rich natural resources, the Company identified an extraordinary opportunity for a foreign renewable energy company to locate its manufacturing facility there, and Solar Enertech wasted no time grasping this opportunity. Leo S. Young, founder and CEO of the company, was a senior member of a California trade mission to the country last November and along with the participation of Governor Schwarzenegger managed to organize an Energy Round Table in Beijing, at which Schwarzenegger, key business leaders and Chinese high officials met for a series of discussions. During the round table, policies for renewable energy by both governments were discussed, favorable incentive packages were outlined, and a mechanism for communication and cooperation between California and China was established.

Less than two months later, China inaugurated its Renewable Energy Act (in January 2006), and Solar Power Enertech launched construction of its solar cell manufacturing plant in Shanghai beginning in February. As of today, the Company's infrastructure and production facility are on schedule to begin producing solar cells in late November at the anniversary of the Energy Round Table in Beijing.

About Solar Energy Tech Corp. (OTCBB: SOEN)

Solar Power EnerTech is a photovoltaic (PV) solar energy cell manufacturing enterprise based in Shanghai, China where the Company is establishing a sophisticated 42,000 square foot manufacturing and research facility in Shanghai's Jinqiao Modern Science and Technology Park. Solar EnerTech plans to invest in PV cell research to develop higher solar power efficiency cells and put the results of that research to use immediately in its manufacturing processes. Led by one of the industry's top scientists, the Company's R&D program will work to bring Solar power EnerTech to the forefront of advanced solar power technology research and production. The Company has also established a marketing, purchasing and distribution arm in Northern California's Silicon Valley.

Forward-Looking Statements

Except for statements of historical fact, the information presented herein may contain forward-looking statements. Such forward-looking statements involve known and unknown risks, uncertainties and other factors, which may cause the actual results, solar power performance or achievements of the Company to be materially different from any future results, solar power performance or achievements expressed or implied by such forward-looking statements. Such factors include general economic and business conditions, the ability to acquire and develop specific projects, the ability to fund operations and changes in consumer and business consumption habits and other factors over which Solar Power EnerTech Corp. has little or no control.

Solar+water fuel

2009-04-06T09:55:00.000-07:00

With catalysts created by an MIT chemist, sunlight can turn water into hydrogen. If the process can scale up, it could make solar power a dominant source of energy.

"I'm going to show you something I haven't showed anybody yet," said Daniel Nocera, a professor of chemistry at MIT, speaking this May to an auditorium filled with scientists and U.S. government energy officials. He asked the house manager to lower the lights. Then he started a video. "Can you see that?" he asked excitedly, pointing to the bubbles rising from a strip of material immersed in water. "Oxygen is pouring off of this electrode." Then he added, somewhat cryptically, "This is the future. We've got the leaf."

What Nocera was demonstrating was a reaction that generates oxygen from water much as green plants do during photosynthesis--an achievement that could have profound implications for the energy debate. Carried out with the help of a catalyst he developed, the reaction is the first and most difficult step in splitting water to make hydrogen gas. And efficiently generating hydrogen from water, Nocera believes, will help surmount one of the main obstacles preventing solar power from becoming a dominant source of electricity: there's no cost-effective way to store the energy collected by solar panels so that it can be used at night or during cloudy days.

Solar power has a unique potential to generate vast amounts of clean energy that doesn't contribute to global warming. But without a cheap means to store this energy, solar power can't replace fossil fuels on a large scale. In Nocera's scenario, sunlight would split water to produce versatile, easy-to-store hydrogen fuel that could later be burned in an internal-combustion generator or recombined with oxygen in a fuel cell. Even more ambitious, the reaction could be used to split seawater; in that case, running the hydrogen through a fuel cell would yield fresh water as well as electricity.

Storing energy from the sun by mimicking photosynthesis is something scientists have been trying to do since the early 1970s. In particular, they have tried to replicate the way green plants break down water. Chemists, of course, can already split water. But the process has required high temperatures, harsh alkaline solutions, or rare and expensive catalysts such as platinum. What Nocera has devised is an inexpensive catalyst that produces oxygen from water at room temperature and without caustic chemicals--the same benign conditions found in plants. Several other promising catalysts, including another that Nocera developed, could be used to complete the process and produce hydrogen gas.

Nocera sees two ways to take advantage of his breakthrough. In the first, a conventional solar panel would capture sunlight to produce electricity; in turn, that electricity would power a device called an electrolyzer, which would use his catalysts to split water. The second approach would employ a system that more closely mimics the structure of a leaf. The catalysts would be deployed side by side with special dye molecules designed to absorb sunlight; the energy captured by the dyes would drive the water-splitting reaction. Either way, solar energy would be converted into hydrogen fuel that could be easily stored and used at night--or whenever it's needed.

Nocera's audacious claims for the importance of his advance are the kind that academic chemists are usually loath to make in front of their peers. Indeed, a number of experts have questioned how well his system can be scaled up and how economical it will be. But Nocera shows no signs of backing down. "With this discovery, I totally change the dialogue," he told the audience in May. "All of the old arguments go out the window."

Bright Days for Solar-New investment fuels promising energy research at MIT.

2009-04-06T09:41:00.000-07:00

When Tonio Buonassisi finished his PhD at the University of California, Berkeley, in 2006, he wanted out of academia. He had a mission: to cover the world's roofs with solar panels that would provide clean, carbon-free electricity. A cash-strapped university research program wasn't the place to make that happen. But research dollars were plentiful in the solar industry, which was doubling in size every couple of years. Having "lived through times of famine" as a grad student, Buonassisi says, he decided against taking a postdoc appointment and went to work at a manufacturer of solar panels based in Marlborough, MA.

Less than three years later, Buonassisi is back in academia as an assistant professor of mechanical engineering at MIT, which has seen a new surge in solar research propelled by the MIT Energy Initiative and a growing student energy club. For decades, the only solar research at MIT had been carried out intermittently by a small cadre that Buonassisi describes as "a few lonely torch-bearers wandering around in the caves." A "dead period" descended on the worldwide solar-research community after both oil prices and interest in alternative energy plummeted in the mid-1980s, he says. But now the world is clamoring for affordable clean energy. And thanks in large part to the establishment of the MIT-Fraunhofer Center for Sustainable Energy Systems (where Buonassisi is scientific director) and the Solar Revolution Project, tens of millions of dollars earmarked for solar research have started to pour into the Institute from both government and private sources. About 20 MIT researchers have turned their attention to solar energy so far.

The potential of solar power is enormous. In just over one hour, enough energy from the sun reaches the earth to meet the world's needs for an entire year. But as of yet, that potential is far from being realized. Solar panels, which convert the energy in sunlight into electricity, are so expensive and inefficient that they now produce just a fraction of 1 percent of the world's power.

That has to change if the world is to hit widely accepted targets for cutting carbon dioxide emissions while meeting growing energy demand. The targets call for at least 10 million megawatts of carbon-free generating capacity by 2050, most of which will probably need to come from solar, given the limits of other clean energy technologies. Solar power now provides only about 10,000 megawatts worldwide. To reach 10 million megawatts, the solar industry will need to continue its rapid growth for the next 20 to 30 years.

Some of the research at MIT could have an almost immediate impact on the industry. One example is Buonassisi's effort to improve the price and efficiency of solar panel, the semiconductor-based components--most often made of silicon--that convert light into electricity in a solar panel. (Each panel is made of many cells packaged together with electronics and a frame.) Other projects may take longer to complete but could yield big results. One group of researchers is pursuing a way to concentrate sunlight using luminescent dyes developed for next-generation flat-screen displays; such technology could greatly reduce the amount of expensive silicon needed to generate electricity from the sun. Another professor is creating catalysts that imitate photosynthesis, using sunlight to make chemical fuels. That could solve one of the basic problems with solar energy today: there's no good way to store it.

A Better Solar Collector - A more efficient way to concentrate sunlight could reduce the cost of producing solar power.

2009-04-06T09:32:00.000-07:00

Looking to make solar panels cheaper, MIT researchers have created sheets of glass coated with advanced organic dyes that more efficiently concentrate sunlight. The researchers, whose results appear in this week's issue of Science, say that the coated glass sheets could eventually make solar power as cheap as electricity from fossil fuels.

The researchers show that the glass sheets can reduce the amount of expensive semiconducting material needed in solar panels and provide a cheap way to extract more energy from high-energy photons, such as those at the blue end of the spectrum. "This could be the cheapest solar technology," says Marc Baldo, a professor of electrical engineering at MIT. "And I think one day, it could be competitive with coal."

The simple, flat sheets of glass have a number of advantages over previous solar concentrators, devices that gather sunlight over a large area and focus it onto a small solar cell that converts the light into electricity. Solar power concentrators in use now employ mirrors or lenses to focus the light Because the new glass sheets are lighter and flat, they can easily be incorporated into solar panels on roofs or building facades. They could also be used as windows, which, connected to solar cells, could generate electricity. What's more, mirrors and lenses require mechanical systems for tracking the sun to keep the light focused on a small solar cell. These tracking systems add cost and can break down over the decades that solar panels are made to be in service. The flat glass concentrators don't require a tracking system.

Instead of using optics, the glass sheets concentrate light using combinations of organic dyes specially designed by Baldo and his coworkers. Light is absorbed by the organic dyes coating one side of the glass sheet. The dyes then emit the light into the glass. The glass channels the light emitted by the dye to the edges of the glass, in the same way that fiber-optic cables channel light over long distances. Narrow solar cells laminated to the edges of the glass collect the light and convert it into electricity. The amount of light concentration depends on the size of the sheet--specifically, the ratio between the size of the surface of the glass and the edges. To a point, the greater the concentration, the less semiconductor material is needed, and the cheaper the solar power.

The challenge of using organic dyes as solar concentrators has been that the dyes tend to reabsorb much of the light before it can reach the edges of the glass. Baldo overcame that problem by using dyes that don't absorb the light that they emit. For example, a dye might absorb a range of colors in the light spectrum, such as ultraviolet through green, but emit light in another color, such as orange, which the dye cannot absorb.

Solar without the Panels - Utilities are using the sun's heat to boil water for steam turbines.

2009-04-06T09:03:00.000-07:00

Investors and utilities intent on building solar power plants are increasingly turning to solar thermal power, a comparatively low-tech alternative to photovoltaic panels that convert sunlight directly into electricity. This month, in the latest in a string of recent deals, Spanish solar-plant developer Abengoa Solar power and Phoenix-based utility Arizona Public Service announced a 280-megawatt solar thermal project in Arizona. By contrast, the world's largest installations of photovoltaics generate only 20 megawatts of power.

In a solar thermal plant, mirrors concentrate sunlight onto some type of fluid that is used, in turn, to boil water for a steam turbine. Over the past year, developers of solar thermal technology such as Abengoa, Ausra, and Solel Solar Systems have picked up tens of millions of dollars in financing and power contracts from major utilities such as Pacific Gas and Electric and Florida Power and Light. By 2013, projects in development in just the United States and Spain promise to add just under 6,000 megawatts of solar thermal power generation to the barely 100 megawatts installed worldwide last year, says Cambridge, MA, consultancy Emerging Energy Research.

The appeal of solar thermal power is twofold. It is relatively low cost at a large scale: an Economic analysis released last month by Severin Borenstein, director of the University of California's Energy Institute, notes that solar thermal power will become cost competitive with other forms of power generation decades before photovoltaics will, even if greenhouse-gas emissions are not taxed aggressively.

Solar thermal developers also say that their solar power is more valuable than that provided by wind, currently the fastest-growing form of renewable energy. According to the U.S. Department of Energy, wind power costs about 8 cents per kilowatt, while solar thermal power costs 13 to 17 cents. But power from wind farms fluctuates with every gust and lull; solar thermal plants, on the other hand, capture solar energy as heat, which is much easier to store than electricity. Utilities can dispatch this stored solar energy when they need it--whether or not the sun happens to be shining. "That's going to be worth a lot of money," says Terry Murphy, president and chief executive officer of Solar power Reserve, a Santa Monica, CA, developer of solar thermal technology. "People are coming to realize that power shifting and 'dispatchability' are key to the utility's requirements to try to balance their system."

In fact, the capacity to store energy is critical to the economics of the solar thermal plant. Without storage, a solar thermal plant would need a turbine large enough to handle peak steam production, when the sun is brightest, but which would otherwise be underutilized. Stored heat means that a plant can use a smaller, cheaper steam turbine that can be kept running steadily for more hours of the day. While adding storage would substantially increase the cost of the energy produced by a photovoltaic array or wind farm, it actually reduces the cost per kilowatt of the energy produced by solar thermal plants.

The amount of storage included in a plant--expressed as the number of hours that it can keep the turbine running full tilt--will vary according to capital costs and the needs of a given utility. "There is an optimal point that could be three hours of storage or six hours of storage, where the cents per kilowatt- hour is the lowest," says Fred Morse, senior advisor for U.S. operations with Abengoa Solar. Morse says that the company's 280-megawatt plant in Arizona, set to begin operation by 2011, will have six hours of storage, while other recent projects promise seven to eight.

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Solar power and energy technologies around ther world

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Solar energy is the radiant light and heat from the Sun that has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation along with secondary solar resources such as wind and wave power, hydroelectricity and biomass account for most of the available renewable energy on Earth. Only a minuscule fraction of the available solar energy is used.

Solar power technologies provide electrical generation by means of heat engines or photovoltaics. Once converted its uses are only limited by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, hot water, thermal energy for cooking, and high temperature process heat for industrial purposes.

Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute sunlight. Active solar techniques include the use of photovoltaic panels, solar thermal collectors, with electrical or mechanical equipment, to convert sunlight into useful outputs. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.

Energy from the Sun

Main articles: Insolation and Solar radiation

The Earth receives 174 petawatts (PW) of incoming solar radiation (insolation) at the upper atmosphere. Approximately 30% is reflected back to space while the rest is absorbed by clouds, oceans and land masses. The spectrum of solar power lighting at the Earth's surface is mostly spread across the visible and near-infrared ranges with a small part in the near-ultraviolet.

Earth's land surface, oceans and atmosphere absorb solar radiation, and this raises their temperature. Warm air containing evaporated water from the oceans rises, causing atmospheric circulation or convection. When the air reaches a high altitude, where the temperature is low, water vapor condenses into clouds, which rain onto the Earth's surface, completing the water cycle. The latent heat of water condensation amplifies convection, producing atmospheric phenomena such as wind, cyclones and anti-cyclones. Sunlight absorbed by the oceans and land masses keeps the surface at an average temperature of 14 °C. By photosynthesis green plants convert solar energy into chemical energy, which produces food, wood and the biomass from which fossil fuels are derived.

The total solar energy absorbed by Earth's atmosphere, oceans and land masses is approximately 3,850,000 exajoules (EJ) per year. In 2002, this was more energy in one hour than the world used in one year. Solar power captures approximately 3,000 EJ per year in biomass. The amount of solar energy reaching the surface of the planet is so vast that in one year it is about twice as much as will ever be obtained from all of the Earth's non-renewable resources of coal, oil, natural gas, and mined uranium combined.

From the table of resources it would appear that solar power, wind or biomass would be sufficient to supply all of our energy needs, however, the increased use of biomass has had a negative effect on global warming and dramatically increased food prices by diverting forests and crops into biofuel production. As intermittent resources, solar and wind raise other issues.

Applications of solar technology

Solar energy refers primarily to the use of solar radiation for practical ends. All other renewable energies other than geothermal derive their energy from the sun.

Solar technologies are broadly characterized as either passive or active depending on the way they capture, convert and distribute sunlight. Active solar techniques use photovoltaic panels, pumps, and fans to convert sunlight into useful outputs. Passive solar techniques include selecting materials with favorable thermal properties, designing spaces that naturally circulate air, and referencing the position of a building to the Sun. Active solar power technologies increase the supply of solar energy and are considered supply side technologies, while passive solar technologies reduce the need for alternate resources and are generally considered demand side technologies.

Agriculture and horticulture

Main articles: Agriculture, Horticulture, and Greenhouse

Agriculture seeks to optimize the capture of solar energy in order to optimize the productivity of plants. Techniques such as timed planting cycles, tailored row orientation, staggered heights between rows and the mixing of plant varieties can improve crop yields. While sunlight is generally considered a plentiful resource, the exceptions highlight the importance of solar energy to agriculture. During the short growing seasons of the Little Ice Age, French and English farmers employed fruit walls to maximize the collection of solar energy. These walls acted as thermal masses and accelerated ripening by keeping plants warm. Early fruit walls were built perpendicular to the ground and facing south, but over time, sloping walls were developed to make better use of sunlight. In 1699, Nicolas Fatio de Duillier even suggested using a tracking mechanism which could pivot to follow the Solar power. Applications of solar energy in agriculture aside from growing crops include pumping water, drying crops, brooding chicks and drying chicken manure. More recently the technology has been embraced by vinters, who use the energy generated by solar panels to solar power grape presses.

Greenhouses convert solar power lighting to heat, enabling year-round production and the growth (in enclosed environments) of specialty crops and other plants not naturally suited to the local climate. Primitive greenhouses were first used during Roman times to produce cucumbers year-round for the Roman emperor Tiberius. The first modern greenhouses were built in Europe in the 16th century to keep exotic plants brought back from explorations abroad. Greenhouses remain an important part of horticulture today, and plastic transparent materials have also been used to similar effect in polytunnels and row covers.

Architecture and urban planning

Main articles: Passive solar power building design and Urban heat island

Sunlight has influenced building design solar power system since the beginning of architectural history.Advanced solar architecture and urban planning methods were first employed by the Greeks and Chinese, who oriented their buildings toward the south to provide light and warmth.

The common features of passive solar power architecture are orientation relative to the Sun, compact proportion (a low surface area to volume ratio), selective shading (overhangs) and thermal mass. When these features are tailored to the local climate and environment they can produce well-lit spaces that stay in a comfortable temperature range. Socrates' Megaron House is a classic example of passive solar design. The most recent approaches to solar design use computer modeling tying together solar lighting, heating and ventilation systems in an integrated solar design package. Active solar equipment such as pumps, fans and switchable windows can complement passive design and improve system performance.

Urban heat islands (UHI) are metropolitan areas with higher temperatures than that of the surrounding environment. The higher temperatures are a result of increased absorption of the Solar power lighting by urban materials such as asphalt and concrete, which have lower albedos and higher heat capacities than those in the natural environment. A straightforward method of counteracting the UHI effect is to paint buildings and roads white and plant trees. Using these methods, a hypothetical "cool communities" program in Los Angeles has projected that urban temperatures could be reduced by approximately 3 °C at an estimated cost of US$1 billion, giving estimated total annual benefits of US$530 million from reduced air-conditioning costs and healthcare savings.

Solar lighting

Daylighting features such as this oculus at the top of the Pantheon in Rome have been in use since antiquity.

The history of lighting is dominated by the use of natural light. The Romans recognized a right to light as early as the 6th century and English law echoed these judgments with the Prescription Act of 1832. In the 20th century artificial lighting became the main source of interior illumination but daylighting techniques and hybrid solar lighting solutions are ways to reduce energy consumption.

Daylighting systems collect and distribute sunlight to provide interior illumination. This passive technology directly offsets energy use by replacing artificial lighting, and indirectly offsets non-solar energy use by reducing the need for air-conditioning. Although difficult to quantify of solar power, the use of natural lighting also offers physiological and psychological benefits compared to artificial lighting. Daylighting design implies careful selection of window types, sizes and orientation; exterior shading devices may be considered as well. Individual features include sawtooth roofs, clerestory windows, light shelves, skylights and light tubes. They may be incorporated into existing structures, but are most effective when integrated into a solar power design package that accounts for factors such as glare, heat flux and time-of-use. When daylighting features are properly implemented they can reduce lighting-related energy requirements by 25%.

Hybrid solar lighting is an active solar method of providing interior illumination. HSL systems collect sunlight using focusing mirrors that track the Sun and use optical fibers to transmit it inside the building to supplement conventional lighting. In single-story applications these systems are able to transmit 50% of the direct sunlight received.

Solar lights that charge during the day and light up at dusk are a common sight along walkways.[citation needed]

Although daylight saving time is promoted as a way to use sunlight to save energy, recent research has been limited and reports contradictory results: several studies report savings, but just as many suggest no effect or even a net loss, particularly when gasoline consumption is taken into account. Electricity use is greatly affected by geography, climate and economics, making it hard to generalize from single studies.

Solar thermal

Main article: Solar thermal energy

Solar thermal technologies can be used for water heating, space heating, space cooling and process heat generation.

Water heating

Main articles: Solar hot water and Solar combisystem

Solar power for hot water systems use sunlight to heat water. In low geographical latitudes (below 40 degrees) from 60 to 70% of the domestic hot water use with temperatures up to 60 °C can be provided by solar heating systems. The most common types of solar water heaters are evacuated tube collectors (44%) and glazed flat plate collectors (34%) generally used for domestic hot water; and unglazed plastic collectors (21%) used mainly to heat swimming pools.

As of 2007, the total installed capacity of solar hot water systems is approximately 154 GW.[40] China is the world leader in their deployment with 70 GW installed as of 2006 and a long term goal of 210 GW by 2020. Israel and Cyprus are the per capita leaders in the use of solar hot water systems with over 90% of homes using them. In the United States, Canada and Australia heating swimming pools is the dominant application of solar hot water with an installed capacity of 18 GW as of 2005.

Heating, cooling and ventilation

Main articles: Solar heating, Thermal mass, Solar chimney, and Solar air conditioning

In the United States, heating, ventilation and air conditioning (HVAC) systems account for 30% (4.65 EJ) of the energy used in commercial buildings and nearly 50% (10.1 EJ) of the solar energy used in residential buildings. Solar heating, cooling and ventilation technologies can be used to offset a portion of this solar energy.

Thermal mass is any material that can be used to store solar power—heat from the Sun in the case of solar energy. Common thermal mass materials include stone, cement and water. Historically they have been used in arid climates or warm temperate regions to keep buildings cool by absorbing solar energy during the day and radiating stored heat to the cooler atmosphere at night. However they can be used in cold temperate areas to maintain warmth as well. The size and placement of thermal mass depend on several factors such as climate, daylighting and shading conditions. When properly incorporated, thermal mass maintains space temperatures in a comfortable range and reduces the need for auxiliary heating and cooling equipment.

A solar chimney (or thermal chimney, in this context) is a passive solar ventilation system composed of a vertical shaft connecting the interior and exterior of a building. As the chimney warms, the air inside is heated causing an updraft that pulls air through the building. Performance can be improved by using glazing and thermal mass materials in a way that mimics greenhouses.[citation needed]

Deciduous trees and plants have been promoted as a means of controlling solar power heating and cooling. When planted on the southern side of a building, their leaves provide shade during the summer, while the bare limbs allow light to pass during the winter. Since bare, leafless trees shade 1/3 to 1/2 of incident solar radiation, there is a balance between the benefits of summer shading and the corresponding loss of winter heating. In climates with significant heating loads, deciduous trees should not be planted on the southern side of a building because they will interfere with winter solar power availability. They can, however, be used on the east and west sides to provide a degree of summer shading without appreciably affecting winter solar gain.

Water treatment

Main articles: Solar still, Solar water disinfection, Solar desalination, and Solar Power Desalination Unit

Solar distillation can be used to make saline or brackish water potable. The first recorded instance of this was by 16th century Arab alchemists.A large-scale solar distillation project was first constructed in 1872 in the Chilean mining town of Las Salinas.The plant, which had solar collection area of 4,700 m², could produce up to 22,700 L per day and operated for 40 years.Individual still designs include single-slope, double-slope (or greenhouse type), vertical, conical, inverted absorber, multi-wick, and multiple effect.These stills can operate in passive, active, or hybrid modes. Double-slope stills are the most economical for decentralized domestic purposes, while active multiple effect units are more suitable for large-scale applications.

Solar water disinfection (SODIS) involves exposing water-filled plastic polyethylene terephthalate (PET) bottles to sunlight for several hours. Exposure times vary depending on weather and climate from a minimum of six hours to two days during fully overcast conditions. SODIS is recommended by the World Health Organization as a viable method for household water treatment and safe storage. Over two million people in developing countries use SODIS for their daily drinking water.

Solar energy may be used in a water stabilisation pond to treat waste water without chemicals or electricity. A further environmental advantage is that algae grow in such ponds and consume carbon dioxide in photosynthesis.

Solar energy has also be used for detoxification of contaminated water via photolysis.[citation needed] The economics of this process is though doubtful.

Process heat

Main articles: Solar pond, Salt evaporation pond, and Solar furnace

Solar concentrating technologies such as parabolic dish, trough and Scheffler reflectors can provide process heat for commercial and industrial applications. The first commercial system was the Solar Total Energy Project (STEP) in Shenandoah, Georgia, USA where a field of 114 parabolic dishes provided 50% of the solar power process heating, air conditioning and electrical requirements for a clothing factory. This grid-connected cogeneration system provided 400 kW of electricity plus thermal energy in the form of 401 kW steam and 468 kW chilled water, and had a one hour peak load thermal storage.

Evaporation ponds are shallow pools that concentrate dissolved solids through evaporation. The use of evaporation ponds to obtain salt from sea water is one of the oldest applications of solar energy. Modern uses include concentrating brine solutions used in leach mining and removing dissolved solids from waste streams.

Clothes lines, clotheshorses, and clothes racks dry clothes through evaporation by wind and sunlight without consuming electricity or gas. In some states of the United States legislation protects the "right to dry" clothes.

Unglazed transpired collectors (UTC) are perforated sun-facing walls used for preheating ventilation air. UTCs can raise the incoming air temperature up to 22 °C and deliver outlet temperatures of 45–60 °C.[66] The short payback period of transpired collectors (3 to 12 years) makes them a more cost-effective alternative than glazed collection systems. As of 2003, over 80 systems with a combined collector area of 35,000 m² had been installed worldwide, including an 860 m² collector in Costa Rica used for drying coffee beans and a 1,300 m² collector in Coimbatore, India used for drying marigolds.

Cooking

Main article: Solar cooker

Solar power cookers use sunlight for cooking, drying and pasteurization. They can be grouped into three broad categories: box cookers, panel cookers and reflector cookers. The simplest solar cooker—the box cooker first built by Horace de Saussure in 1767. A basic box cooker consists of an insulated container with a transparent lid. It can be used effectively with partially overcast skies and will typically reach temperatures of 90–150 °C. Panel cookers use a reflective panel to direct sunlight onto an insulated container and reach temperatures comparable to box cookers. Reflector cookers use various concentrating geometries (dish, trough, Fresnel mirrors) to focus light on a cooking container. These cookers reach temperatures of 315 °C and above but require direct light to function properly and must be repositioned to track the Sun.

The solar bowl is a concentrating technology employed by the Solar Kitchen in Auroville, India, where a stationary spherical reflector focuses light along a line perpendicular to the sphere's interior surface, and a computer control system moves the receiver to intersect this line. Steam is produced in the receiver at temperatures reaching 150 °C of solar power and then used for process heat in the kitchen.

A reflector developed by Wolfgang Scheffler in 1986 is used in many solar kitchens. Scheffler reflectors are flexible parabolic dishes that combine aspects of trough and power tower concentrators. Polar tracking is used to follow the Sun's daily course and the curvature of the reflector is adjusted for seasonal variations in the incident angle of sunlight. These reflectors can reach temperatures of 450–650 °C and have a fixed focal point, which simplifies cooking. The world's largest Scheffler reflector system in Abu Road, Rajasthan, India is capable of cooking up to 35,000 meals a day. As of 2008, over 2,000 large Scheffler cookers had been built worldwide.

Electrical generation

Sunlight can be converted into electricity using photovoltaics (PV), concentrating solar power (CSP), and various experimental technologies. PV has mainly been used to power small and medium-sized applications, from the calculator powered by a single solar cell to off-grid homes powered by a photovoltaic array. For large-scale generation, CSP plants like SEGS have been the norm but recently multi-megawatt PV plants are becoming common. Completed in 2007, the 14 MW power station in Clark County, Nevada and the 20 MW site in Beneixama, Spain are characteristic of the trend toward larger photovoltaic power stations in the US and Europe. As an intermittent power source, solar power requires a backup supply, which can partially be complemented with wind power. Local backup usually is done with batteries, while utilities normally use pumped-hydro storage. The Institute for Solar Energy Supply Technology of the University of Kassel pilot-tested a combined power plant linking solar, wind, biogas and hydrostorage to provide load-following power around the clock, entirely from renewable sources.

Photovoltaics

Main article: Photovoltaics

A solar cell, or photovoltaic cell (PV), is a device that converts light into direct current using the photoelectric effect. The first solar cell was constructed by Charles Fritts in the 1880s. Although the prototype selenium cells converted less than 1% of incident light into electricity, both Ernst Werner von Siemens and James Clerk Maxwell recognized the importance of this discovery. Following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the silicon solar cell in 1954. These early solar cells cost 286 USD/watt and reached efficiencies of 4.5–6%.

The earliest significant application of solar cells was as a back-up power source to the Vanguard I satellite in 1958, which allowed it to continue transmitting for over a year after its chemical battery was exhausted. The successful operation of solar cells on this mission was duplicated in many other Soviet and American satellites, and by the late 1960s, PV had become the established source of solar power for them. Photovoltaics went on to play an essential part in the success of early commercial satellites such as Telstar, and they remain vital to the telecommunications infrastructure today.

The high cost of solar cells limited terrestrial uses throughout the 1960s. This changed in the early 1970s when prices reached levels that made PV generation competitive in remote areas without grid access. Early terrestrial uses included solar powering telecommunication stations, off-shore oil rigs, navigational buoys and railroad crossings. These off-grid applications have proven very successful and accounted for over half of worldwide installed capacity until 2004.

The 1973 oil crisis stimulated a rapid rise in the production of PV during the 1970s and early 1980s. Economies of scale which resulted from increasing production along with improvements in solar power system performance brought the price of PV down from 100 USD/watt in 1971 to 7 USD/watt in 1985. Steadily falling oil prices during the early 1980s led to a reduction in funding for photovoltaic R&D and a discontinuation of the tax credits associated with the Energy Tax Act of 1978. These factors moderated growth to approximately 15% per year from 1984 through 1996.

Since the mid-1990s, leadership in the PV sector has shifted from the US to Japan and Germany. Between 1992 and 1994 Japan increased R&D funding, established net metering guidelines, and introduced a subsidy program to encourage the installation of residential PV systems. As a result, PV installations in the country climbed from 31.2 MW in 1994 to 318 MW in 1999, and worldwide production growth increased to 30% in the late 1990s.

Germany has become the leading PV market worldwide since revising its Feed-in tariff system as part of the Renewable Energy Sources Act. Installed PV capacity has risen from 100 MW in 2000 to approximately 4,150 MW at the end of 2007. Spain has become the third largest PV market after adopting a similar feed-in tariff structure in 2004, while France, Italy, South Korea and the US have seen rapid growth recently due to various incentive programs and local market conditions. The power output of domestic photovoltaic devices is usually described in kilowatt-peak (kWp) units.

Concentrating solar power

Main article: Concentrating solar power

Concentrated sunlight has been used to perform useful tasks since the time of ancient China. A legend claims that Archimedes used polished shields to concentrate sunlight on the invading Roman fleet and repel them from Syracuse. Auguste Mouchout used a parabolic trough to produce steam for the first solar steam engine in 1866, and subsequent developments led to the use of concentrating solar-powered devices for irrigation, refrigeration and locomotion.

Concentrating Solar Power (CSP) systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. The concentrated light is then used as a heat source for a conventional power plant. A wide range of concentrating technologies exists; the most developed are the solar trough, parabolic dish and solar power tower. These methods vary in the way they track the Sun and focus light. In all these systems a working fluid is heated by the concentrated sunlight, and is then used for power generation or energy storage.

A solar trough consists of a linear parabolic reflector that concentrates light onto a receiver positioned along the reflector's focal line. The reflector is made to follow the Sun during the daylight hours by tracking along a single axis. Trough systems provide the best land-use factor of any solar technology. The SEGS plants in California and Acciona's Nevada Solar One near Boulder City, Nevada are representatives of this technology.

A parabolic dish system consists of a stand-alone parabolic reflector that concentrates light onto a receiver positioned at the reflector's focal point. The reflector tracks the Sun along two axes. Parabolic dish systems give the highest efficiency among CSP technologies. The 50 kW Big Dish in Canberra, Australia is an example of this technology.The stirling solar dish combines a parabolic concentrating dish with a stirling heat engine which normally drives an electric generator. The advantages of stirling solar over photovoltaic cells are higher efficiency of converting sunlight into electricity and longer lifetime. A stirling engine has an approximate mean time before failure (MTBF) of 25 years.[citation needed]

A solar power tower uses an array of tracking reflectors (heliostats) to concentrate light on a central receiver atop a tower. Power towers are less advanced than trough systems but offer higher efficiency and better energy storage capability. The Solar Two in Barstow, California and the Planta Solar 10 in Sanlucar la Mayor, Spain are representatives of this technology.

Experimental solar power

Main articles: Solar updraft tower, Solar pond, Thermogenerator, and Space solar power

A solar updraft tower (also known as a solar chimney or solar tower) consists of a large greenhouse that funnels into a central tower. As sunlight shines on the greenhouse, the air inside is heated, and expands. The expanding air flows toward the central tower, where a turbine converts the air flow into electricity. A 50 kW prototype was constructed in Ciudad Real, Spain and operated for eight years before decommissioning in 1989.

A solar pond is a pool of salt water (usually 1–2 mHungary in which the temperature increased with depth. This effect was due to salts in the lake's water, which created a "density gradient" that prevented convection currents. A prototype was constructed in 1958 on the shores of the Dead Sea near Jerusalem. The pond consisted of layers of water that successively increased from a weak salt solution at the top to a high salt solution at the bottom. This solar pond was capable of producing temperatures of 90 °C in its bottom layer and had an estimated solar-to-electric efficiency of two percent.

Thermoelectric, or "thermovoltaic" devices convert a temperature difference between dissimilar materials into an electric current. First proposed as a method to store solar energy by solar pioneer Mouchout in the 1800s, thermoelectrics reemerged in the Soviet Union during the 1930s. Under the direction of Soviet scientist Abram Ioffe a concentrating system was used to thermoelectrically generate power for a 1 hp engine. Thermogenerators were later used in the US space program as an energy conversion technology for powering deep space missions such as Cassini, Galileo and Viking. Research in this area is focused on raising the efficiency of these devices from 7–8% to 15–20%.

Space solar power systems would use a large solar array in geosynchronous orbit to collect sunlight and beam this energy in the form of microwave radiation to receivers (rectennas) on Earth for distribution. This concept was first proposed by Dr. Peter Glaser in 1968 and since then a wide variety of systems have been studied with both photovoltaic and concentrating solar thermal technologies being proposed. Although still in the concept stage, these systems offer the possibility of delivering power approximately 96% of the time. In 2008, John C. Mankins, a former NASA scientist, successfully used radio waves to send solar power between two Hawaiian islands in an experiment funded by the Discovery Channel. Mankins claims that this "proves the technology exists to beam solar power from satellites back to Earth.".

Solar vehicles

Main articles:Solar vehicle,Electric boat, and Solar balloon

Development of a solar power car has been an engineering goal since the 1980s. The World Solar Challenge is a biannual solar-powered car race, where teams from universities and enterprises compete over 3,021 kilometres (1,877 mi) across central Australia from to Adelaide. In 1987, when it was founded, the winner's average speed was 67 kilometres per hour (42 mph) and by 2007 the winner's average speed had improved to 90.87 kilometres per hour (56.46 mph). The North American Solar Challenge and the plannedSouth African Solar Challenge are comparable competitions that reflect an international interest in the engineering and development of solar power vehicles.

Some vehicles use solar panels for auxiliary power, such as for air conditioning, to keep the interior cool, thus reducing fuel consumption.

In 1975, the first practical solar boat was constructed in England. By 1995, passenger boats incorporating PV panels began appearing and are now used extensively.In 1996, Kenichi Horie made the first solar power crossing of the Pacific Ocean, and the sun21 catamaran made the first solar power crossing of the Atlantic Ocean in the winter of 2006–2007.There are plans to circumnavigate the globe in 2010.

In 1974, the unmanned Sunrise II plane made the first solar flight. On 29 April 1979, the Solar Riser made the first flight in a solar power, fully controlled, man carrying flying machine, reaching an altitude of 40 feet (12 m). In 1980, the Gossamer Penguin made the first piloted flights powered solely by photovoltaics. This was quickly followed by the olar Challenger which crossed the English Channel in July 1981. In 1990 Eric Raymond in 21 hops flew from California to North Carolina using solar power. Developments then turned back to unmanned aerial vehicles (UAV) with the Pathfinder (1997) and subsequent designs, culminating in the Helios which set the altitude record for a non-rocket-propelled aircraft at 29,524 metres (96,860 ft) in 2001. The Zephyr , developed by BAE Systems , is the latest in a line of record-breaking solar aircraft, making a 54-hour flight in 2007, and month-long flights are envisioned by 2010.

A solar balloon is a black balloon that is filled with ordinary air. As sunlight shines on the balloon, the air inside is heated and expands causing an upward buoyancy force, much like an artificially heated hot air balloon. Some solar balloons are large enough for human flight, but usage is generally limited to the toy market as the surface-area to payload-weight ratio is relatively high.

Solar sails are a proposed form of spacecraft propulsion using large membrane mirrors to exploit radiation pressure from the Sun. Unlike rockets, solar sails require no fuel. Although the thrust is small compared to rockets, it continues as long as the Sun shines onto the deployed sail and in the vacuum of space significant speeds can eventually be achieved.

The High-altitude airship (HAA) is an unmanned, long-duration, lighter-than-air vehicle using helium gas for lift, and thin-film solar cells for power. The United States Department of Defense Missile Defense Agency has contracted Lockheed Martin to construct it to enhance the Ballistic Missile Defense System (BMDS).Airships have some advantages for solar-powered flight: they do not require power to remain aloft, and an airship's envelope presents a large area to the Sun.

Solar chemical

Main article: Solar chemical

Solar chemical processes use solar energy to drive chemical reactions. These processes offset energy that would otherwise come from an alternate source and can convert solar energy into storable and transportable fuels. Solar induced chemical reactions can be divided into thermochemical or photochemical.

Hydrogen production technologies been a significant area of solar chemical research since the 1970s. Aside from electrolysis driven by photovoltaic or photochemical cells, several thermochemical processes have also been explored. One such route uses concentrators to split water into oxygen and hydrogen at high temperatures (2300-2600 °C). Another approach uses the heat from solar concentrators to drive the steam reformation of natural gas thereby increasing the overall hydrogen yield compared to conventional reforming methods. Thermochemical cycles characterized by the decomposition and regeneration of reactants present another avenue for hydrogen production. The Solzinc process under development at the Weizmann Institute uses a 1 MW solar furnace to decompose zinc oxide (ZnO) at temperatures above 1200 °C. This solar power initial reaction produces pure zinc, which can subsequently be reacted with water to produce hydrogen.

Sandia's Sunshine to Petrol (S2P) technology uses the high temperatures generated by concentrating sunlight along with a zirconia/ferrite catalyst to break down atmospheric carbon dioxide into oxygen andcarbon monoxide (CO). The carbon monoxide can then be used to synthesize conventional fuels such as methanol, gasoline and jet fuel.

A photogalvanic device is a type of battery in which the cell solution (or equivalent) forms energy-rich chemical intermediates when illuminated. These energy-rich intermediates can potentially be stored and subsequently reacted at the electrodes to produce an electric potential. The ferric-thionine chemical cell is an example of this technology.

Photoelectrochemical cells or PECs consist of a semiconductor, typically titanium dioxide or related titanates, immersed in an electrolyte. When the semiconductor is illuminated an electrical potential develops. There are two types of photoelectrochemical cells: photoelectric cells that convert light into electricity and photochemical cells that use light to drive chemical reactions such as electrolysis.

Solar Energy storage methods

Main articles: Thermal mass,Thermal energy storage, Phase change material, Grid energy storage, and V2G

Solar power Two's thermal storage system generated electricity during cloudy weather and at night.
Solar energy is not available at night, and energy storage is an important issue because modern energy systems usually assume continuous availability of energy.

Thermal mass systems can store solar power energy in the form of heat at domestically useful temperatures for daily or seasonal durations. Thermal storage systems generally use readily available materials with high specific heat capacities such as water, earth and stone. Well-designed systems can lower peak demand, shift time-of-use to off-peak hours and reduce overall heating and cooling requirements.

Phase change materials such as paraffin wax and Glauber's salt are another thermal storage media. These materials are inexpensive, readily available, and can deliver domestically useful temperatures (approximately 64 °C). The "Dover House" (in Dover, Massachusetts) was the first to use a Glauber's salt heating system, in 1948.

Solar energy can be stored at high temperatures using molten salts. Salts are an effective storage medium because they are low-cost, have a high specific heat capacity and can deliver heat at temperatures compatible with conventional solar power systems. The Solar Two used this method of energy storage, allowing it to store 1.44 TJ in its 68 m³ storage tank with an annual storage efficiency of about 99%.

Off-grid PV systems have traditionally used rechargeable batteries to store excess electricity. With grid-tied systems, excess electricity can be sent to the transmission grid. Net metering programs give these systems a credit for the electricity they deliver to the grid. This credit offsets electricity provided from the grid when the system cannot meet demand, effectively using the grid as a storage mechanism.

Pumped-storage hydroelectricity stores energy in the form of water pumped when energy is available from a lower elevation reservoir to a higher elevation one. The energy is recovered when demand is high by releasing the water to run through a hydroelectric power generator.

Development, deployment and economics

Nellis Solar Power Plant, the largest photovoltaic power plant in North America

Beginning with the surge in coal use which accompanied the Industrial Revolution, energy consumption has steadily transitioned from wood and biomass to fossil fuels. The early development of solar power technologies starting in the 1860s was driven by an expectation that coal would soon become scarce. However development of solar technologies stagnated in the early 20th century in the face of the increasing availability, economy, and utility of coal and petroleum.

The 1973 oil embargo and 1979 energy crisis caused a reorganization of energy policies around the world and brought renewed attention to developing solar power technologies. Deployment strategies focused on incentive programs such as the Federal Photovoltaic Utilization Program in the US and the Sunshine Program in Japan. Other efforts included the formation of research facilities in the US, Japan , and Germany.

Between 1970 and 1983 solar panel installations grew rapidly, but falling oil prices in the early 1980s moderated the growth of PV from 1984 to 1996. Since 1997, PV development has accelerated due to supply issues with oil and natural gas, global warming concerns, and the improving economic position of PV relative to other energy technologies. Solar panel production growth has averaged 40% per year since 2000 and installed capacity reached 10.6 GW at the end of 2007. Since 2006 it has been economical for investors to install photovoltaics for free in return for a long term power purchase agreement. 50% of commercial systems were installed in this manner in 2007 and it is expected that 90% will by 2009. Nellis Air Force Base is receiving photoelectric power for about 2.2 ¢/kWh and grid power for 9 ¢/kWh.

Commercial solar water heaters began appearing in the United States in the 1890s. These systems saw increasing use until the 1920s but were gradually replaced by cheaper and more reliable heating fuels. As with photovoltaics, solar water heating attracted renewed attention as a result of the oil crises in the 1970s but interest subsided in the 1980s due to falling petroleum prices. Development in the solar power water heating sector progressed steadily throughout the 1990s and growth rates have averaged 20% per year since 1999. Although generally underestimated, solar water heating is by far the most widely deployed solar technology with an estimated capacity of 154 GW as of 2007.

Commercial concentrating solar power (CSP) plants were first developed in the 1980s. CSP plants such as SEGS project in the United States have a LEC of 12–14 ¢/kWh.The 11 MW PS10 solar power tower in Spain, completed in late 2005, is Europe's first commercial CSP system, and a total capacity of 300 MW is expected to be installed in the same area by 2013.

Solar power installations in recent years have also largely begun to expand into residential areas, with governments offering incentive programs to make "green" energy a more economically viable option. In Canada the government offers the RESOP (Renewable Energy Standard Offer Program).[ citation needed ] The program allows residential homeowners with solar panel installations to sell the energy they produce back to the grid (i.e., the government) at 41¢/kWh, while drawing power from the grid at an average rate of 20¢/kWh. The program is designed to help promote the government's green agenda and lower the strain often placed on the energy grid at peak hours. With the incentives offered by the program the average payback period for a residential solar installation (sized between 1.3 kW and 5 kW) is estimated at 18 to 23 years, considering such cost factors as parts, installation and maintenance, as well as the average energy production of a system on an annual basis.

Daniel Lincot, the chairman of the 2008 European Photovoltaic Solar Energy Conference and the research director of the Paris-based Solar Power Development and Research Institute, said that photovoltaics can cover all the world energy demand. Photovoltaics are 85 times as efficient as growing corn for ethanol. On a 300 feet (91 m) by 300 feet (1 hectare) plot of land enough ethanol can be produced to drive a car 30,000 miles (48,000 km) per year or 2,500,000 miles (4,020,000 km) by covering the same land with photo cells. The deserts of the South Western United States could produce sufficient electricity to fulfill all of the electrical needs of the United States, and could use electrolysis to produce Hydrogen from water to power aircraft.

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Solar panel - Workings of the Photovoltaic Solar Cell

2009-04-04T09:37:00.000-07:00

Breaking down the word photovoltaic (Solar panel), "photo" means light and "voltaic" means electricity. This is essentially what photovoltaic (PV) cells do – convert sunlight into electricity. These little energy building cells are built into solar devices such as modules, or series of solar cells configured in panel and attached to residential roofs. For peak voltage and current, modules can be interconnected in higher numbers, with more solar cells absorbing and converting solar energy. A PV cell consists of a diode, made from a semiconductor. Silicon is still the most widely used for its high efficiency levels in comparison with other material, such as thin film. The semiconductor can transfer heat or electricity from its own material to the metal plates that border the solar cell. To begin the process, the semiconductor must absorb photons in sunlight. This absorption in turn releases atoms, which begin to flow through the semiconductor to create an electrical charge. The metal plates collect the current and transfer it to an inverter. Useable electricity is generated once the inverter changes the solar cell’s direct current into AC current for the home’s utility panel. Silicon wafers, the most frequently used semiconductor in solar cells (which use in solar panel), has a pure crystalline structure. Silicon atoms are layered and electrons increase in number within their centers. Electrons in the interior are always moving outward to take the place of those in the outer layers. Doping silicon with N- and P-type cells results in a process where more electrons can escape so that electrical currents will be generated. Research in alternatives to the silicon wafer has produced foil-based solar cells, polymer solar cells, nanocrystal solar cells and dye-sensitized solar cells which include in solar panel. Solar panel typically have protective glass covering to help absorb heat while keeping it from escaping. The glass also protects the semiconductor material of the solar cells. Solar cell output is measured in watts or kilowatts. Article Source: http://www.solarpanelarticles.com Renee is part of CalFinder's new Resource for Solar power where the mission is to make solar panel installation readily available to homeowners throughout the United States.