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Solar Cells

Sunlight is made of photons which are particles of solar energy. Solar cells collect and trap the photons; the photons only have one way out- through the electrical current. The solar cells are usually made from silicon but can also be made from selenium or other similar elements.

The energy produced in solar cells is direct current electricity and must be converted into alternating current to be used in the home. An inverter accomplishes this and is a vital part of a home solar energy system. Solar cells are wired together so that the electricity can be passed along the circuit to the inverter.

A solar panel is a collection of solar cells. The number of panels needed will depend on the energy demands. The more solar cells, the more energy produced. Solar cells must be placed in direct sunlight and must not be covered by shade, this interrupts the circuit. Additionally solar cells cannot become too warm or efficiency is hindered, for this reason solar panels are usually mounted one to two inches above the roof surface to allow for air circulation.

 

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