Title: Geographical Variation of the Conversion Efficiency of Crystalline Silicon Photovoltaic Modules in Europe
Citation: PROGRESS IN PHOTOVOLTAICS vol. 16 no. 7 p. 595-607
Publication Year: 2008
JRC Publication N°: JRC42317
ISSN: 1062-7995
URI: http://www3.interscience.wiley.com/cgi-bin/fulltext/120839851/PDFSTART
DOI: 10.1002/pip.846
Type: Articles in Journals
Abstract: We present geographical assessment of the performance of crystalline silicon PV modules over Europe. We developed a method that is based on a material specific analytical expression of the PV conversion efficiency, relative to nominal efficiency, as a function of module temperature and irradiance. This method is combined with a climatic database that includes average daytime temperature and irradiance profiles. It is found that the geographical variation in ambient temperature and yearly irradiation causes a decrease in overall yearly PV performance from 3% to 13% relative to the performance under Standard Test Conditions, with the highest decrease found in Mediterranean regions. Based on the above results we developed a simplified linear expression of the relative PV module efficiency that is a simple function of yearly total irradiation and yearly average daytime temperature. The coefficients to the linear expression are found by fitting to the map results from the above mentioned analytical approach. This linear fit predicts total yearly PV output that deviates less than 0.5% from the more detailed calculation, thus providing a faster and more simplified alternative to the yield estimate.
JRC Institute:Institute for Environment and Sustainability

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