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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site energy payback time The time required for any energy producing system or device to produce as much energy as was required in its manufacture. For solar electric panels, this is about 16-20 months. Related categories    • ENERGY SAVING Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP