Terrestrial Photovoltaic Performance Reference Conditions

A comprehensive study has examined the rationale behind the selection of key photovoltaic performance reference (reporting) conditions including the standard Air Mass 1.5 solar spectrum and reference irradiance and cell temperature levels. In addition to providing a repeatable reference for performance comparisons, it is shown that the choice of reference conditions directly controls the accuracy of array energy output prediction calculations. Conclusions are drawn relative to the accuracy associated with present reference conditions, and recommendations are made concerning alternative reference conditions with improved accuracy.