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Brief History of Solar Panels |
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Home solar energy panels produce electricity from sunlight. The first solar energy panels powered satellite was launched in 1958 by Hoffman Electronics, and until the late 1970s solar energy panels were used primarily to power space satellites, lights, and small electronics like calculators and watches. In the early 1990s Germany and Japan initiated long-term home installation incentive programs that resulted in lower costs for home and spurred the growth of robust PVindustries in both countries. |
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"Check with your state for tax credits and rebates" |
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How Home Solar Energy Panels Work
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Basic System Operation: When sunlight hits the solar panel's cells, direct current (DC) flows through the inverter, which converts it to alternating current (AC). The AC power then flows directly into the building (if there is demand), or into backup batteries if the system has them, or to the utility. When the power is flowing back to the utility grid, the electricity meter turns backward. |
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Solar Panel Components |
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The Components: Photovoltaic cells are the core of the solar panel. They are made up of at least two layers of semiconductor material (usually pure silicon infused with boron and phosphorous). One layer has a positive charge, the other a negative charge. When sunlight strikes the solar panel, photons from the light are absorbed by the semiconductor atoms, which then release electrons. The electrons, freed from the negative layer of semiconductor, flow to the positive layer.....thereby producing an electrical current.Since the electric current flows in one direction (like a battery), the electricity generated is called direct current (DC). Many individual cells are wired together in a sealed weatherproof unit called a solar module or panel. |
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