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C.R. Osterwald, K.A. Emery and M. Muller Photovoltaic module calibration value versus optical air mass: the air mass function Progress in Photovoltaics: Research and Applications 22

Version of Record online: 6 DEC 2012 | DOI: 10.1002/pip.2303

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Empirical polynomial expressions of module short-circuit current over total irradiance versus absolute optical air mass are known as “air mass functions”, and are used to approximate the effects of spectral responsivity in several photovoltaic system performance models. From 6 months of outdoor data and a spectral sensitivity model, this paper demonstrates that such functions are not fundamental properties of modules because they vary with time and location. Thus, these functions can actually increase error in system performance modeling.

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