By Markus Schweiger, TÜV Rheinland; Werner Herrmann, TÜV Rheinland; Christos Monokroussos, TÜV Rheinland; Uwe Rau, The Institute for Energy and Climate Research
Varying climatic conditions across markets and the individual characteristics of PV technologies undermine accurate predictions of module energy yield using conventional methods. Markus Schweiger, Werner Herrmann, Christos Monokroussos and Uwe Rau describe how a calculation of module performance ratio can be used to accurately assess the efficiency of different PV module technologies in different climates and thus the likely return on investment from a project