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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 angle of incidence The angle between the normal to a surface and the direction of incident radiation. In reference to solar energy systems, it is the angle between the direction of the sun and the perpendicular to the aperture plane of a solar collector or the surface of a solar panel. Most modern solar panels have only minor reductions in power output within ± 15°. Related category    • SOLAR ENERGY AND POWER Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP