Abstract
The low light performance of solar modules is of high importance for operating cost effective PV systems, particularly during winter season in Europe. In this paper the low light performance of solar cells and modules is investigated with a simple approach. Only three parameters (1) the series resistance, (2) the shunt resistance and (3) the ideality factor are used similar as it was already shown by Grunow et al. in 2004. All three parameters show an explicit correlation to low light behaviour and are therewith potential performance indicators. With this parameter set relative efficiency curves are calculated and compared to measurements on cell level. On module level EL images are taken while the current level is varied. In this way cells with poor weak light performance may be identified in a simple and fast way.
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