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Efficiency
Efficiency
Maximal theoretical efficiency of different solar cells under normal conditions.

General: The relationship between potentially usable energy and actually used energy. To illustrate: Conventional light bulbs transform about 3-4 % of the used energy into light; Solar Cells reach efficiencies of about 11—17 % when converting light into electricity; and a Solar Heating System can transform 25—40 % of Solar Radiation into usable heat.

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