A combined irradiance-transmittance solar spectrum and its application to photovoltaic efficiency calculations

Computer Science

Scientific paper

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Atmospheric Attenuation, Energy Conversion Efficiency, Photovoltaic Cells, Solar Cells, Solar Spectra, Earth Surface, Irradiance, Microwave Spectra, Spectral Bands, Transmittance, Volt-Ampere Characteristics

Scientific paper

The paper reports on the development of a new solar power density spectrum, SOLTRAN, and its application to the calculation of maximum potential efficiencies of photovoltaic cells. SOLTRAN is a combined solar irradiance-atmospheric transmittance computer model capable of predicting the direct (circumsolar radiation excluded) solar beam intensity spectrum (0.25-3.0 microns) at the earth's surface. Earlier solar spectra in the wavelength region 0.8-1.0 micron are discussed in some detail because of their importance to photovoltaic converters. It is shown that SOLTRAN correctly incorporates the accepted water absorption bands, as do Moon's (1940) spectra. The terrestrial spectra reported by Gates (1966) and Thomas and Thekaekara (1976) are found to be incorrect in this wavelength region.

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