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Alternative Energy Bulletin
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Solar Cells
Solar cells, also referred to as photovoltaic cells, are devices that generate electricity directly from sunlight. Solar cells are made from materials similar to those used in computer chips. When sunlight strikes these materials, the energy knocks electrons from atoms, causing the electrons to flow through the material to produce electricity. The use of solar cells has expanded, as manufacturing costs have declined and as tax and rebate incentives have been introduced. In many jurisdictions, the expense of installing a solar system can be recouped in five to ten years from savings on utility bills. "Grid-connected" systems -- those systems that use an inverter to connect to the utility grid instead of relying on batteries -- now make up the largest part of the market. Solar cells are usually combined into modules that hold about forty cells. These modules are mounted in arrays that can measure up to several meters on a side. Several connected arrays can provide enough power for a household. For large electric utility or industrial applications, hundreds of arrays can be interconnected to form a single system. Thin film technology has made it possible for solar cells to double as rooftop shingles, roof tiles, building facades, or the glazing for skylights or atria. The solar cell version of items such as shingles offer the same protection and durability as ordinary asphalt shingles. (Wikipedia)
Resources: Borrego SolarRecurrent Energy SPG Solar Go Solar California CalFinder Florida Solar Innovators Vote Solar First Solar
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