Estimating PV performance over large geographical regions

We present a method for estimating the performance of PV modules over large geographical regions. It uses solar radiation and temperature geospatial data that are modeled in a geographical information system. We employ a relation for the conversion efficiency of crystalline silicon cells at varying irradiance and temperature to obtain values for the loss of efficiency at any location. The method has been applied to the European subcontinent. Results indicate that the relative efficiency of crystalline Si modules varies across Europe with values ranging from 87 to 97% of the conversion efficiency at STC (highest in the North and in mountainous areas).