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Impact of rain and soiling on potential induced degradation

: Köhl, M.; Hoffmann, S.


Progress in Photovoltaics 24 (2016), No.10, pp.1304-1309
ISSN: 1062-7995
Journal Article
Fraunhofer ISE ()
Solarthermie und Optik; Photovoltaik; Silicium-Photovoltaik; Feedstock; Kristallisation und Wafering

The electrical potential between the cells and ground can cause leakage currents that are a necessary but not sufficient indicator for potential induced degradation that is because of the migration of sodium ions into the silicon cells. Outdoor exposure of modules with high-voltage bias in two different climate regions with monitoring of the climatic data, the module temperatures as well as the leakage currents was used to investigate the effect of rain-induced and soiling-induced increase of the surface conductivity, the leakage current and the decrease of the module performance.