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Effect of humidity and temperature on the potential-induced degradation

: Hoffmann, S.; Köhl, M.


Progress in Photovoltaics 22 (2014), Nr.2, S.173-179
ISSN: 1062-7995
Fraunhofer ISE ()
Photovoltaische Module; Systeme und Zuverlässigkeit; Photovoltaische Module und Kraftwerke; Photovoltaische Module - Systeme und Zuverlässigkeit; Gebrauchsdauer von Modulen und Materialien; Gebrauchsdaueranalyse und Umweltsimulation;

This paper focusses on the physical conditions for a degradation mechanism of photovoltaic modules, known as potential-induced degradation. The analysis was made on several levels. At first, the influence of humidity and temperature on the potential-induced leakage current has been investigated, the second step consists of an accelerated test scheme in a climatic chamber and the third one is outdoor exposure with high voltage stress in two different climate regions. The humidity has a huge impact on the leakage current. Therefore, a test in the climate chamber accelerates the stress found in the field of some orders of magnitude.