WIP Wirtschaft und Infrastruktur GmbH & Co Planungs KG
European Photovoltaic Solar Energy Conference edition:27 location:Frankfurt date:23-28 September 2012
A relative normalized irradiance-dependent efficiency of photovoltaic modules is recommended as an objective means of quantifying their behaviour under variable irradiance conditions. It allows users to decouple the irradiance-dependent behaviour of photovoltaic modules from their temperature dependence. This criterion is shown to have a broad applicability in diagnostics by manufacturers and users of photovoltaic module's data sheets.
A selection of calculated values of the relative normalized irradiance-dependent efficiency obtained from a survey of 121 data sheets by 30 leading manufacturers are graphically presented.
These figures indicate that there are quantifiable irradiance-dependent differences between photovoltaic module technologies and manufacturers.
An illustration of comparisons based on the irradiance-dependent behaviour between different technologies and different modules is given.
A recommendation is made for the following edition of the EN 50380 standard for photovoltaic module data sheets, to require that the measured power-irradiance, power-temperature matrix according to the new IEC 61853-1 standard be incorporated.