The efficiency of solar modules depends, among others, on the module temperature, the received irradiance and the spectral distribution of the irradiance. In the field these meteorological parameters vary spatially and temporally and can deviate considerably from the standard test conditions (STC) used to characterise the modules, and the real-life module efficiency will deviate from the nominal efficiency. As a consequence the choice for a certain module is not only determined by its price per Wattpeak and its durability, but also by how well it is suited for certain climatological conditions. For example some thin film manufacturers claim that their product is especially suitable for North European climates with many cloudy days.
In the FLINS project we investigate if it is possible to determine significant differences between the yields of different module types for North-German conditions. With this aim six different PV-systems have been built on the roof of the City-hall in Osnabrück, in Lower-Saxony in Germany. The systems are identical, except for the applied module types. They are monitored in great detail to not only establish yield differences, but also to identify the origin of these differences.
- Carl von Ossietzky University Oldenburg, Energy and Semiconductor Laboratory, Solar Energy Meteorology Group (project co-ordinator)
- University of applied sciences Osnabrück, Laboratory for Physics and Solar Energy Technology (link: www.ecs.hs-osnabrueck.de/physikundsolar0.html )
- Beracon-Energy, Osnabrück link: www.beracon-energy.de
- Verein für Umweltschutz durch Photovoltaik Osnabrück (PVO) link:www.photovoltaikverein-osnabrueck.de/
The FLINS project is supported by the Deutsche Bunderstiftung Umwelt (German Federal Foundation for the Environment)