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Photovoltaics
Photovoltaics are silicon-based devices which, under sunlight, generate a low-voltage direct electric current. The quantity of electricity produced is directly related to the intensity of incident solar radiation or irradiance (W/m2 ). Both direct and diffuse sunlight are effective, although the intensity of direct sunlight is typically tenfold that of an overcast sky, and the efficiency of energy conversion is around 15%. Photovoltaic cells are connected in series to generate a higher voltage.
The supply is then passed through an inverter to convert the direct current into more useable alternating current at the standard voltage. The electricity generated may then be used within the building or sold back into the national supply if generation exceeds the demand.
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