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2009
Conference Paper
Titel
Comparison of indoor and outdoor power measurements of thin film modules
Abstract
Stabilised electrical performance data are necessary to compare different types of modules in the emerging thin-film PV market and as basic information for energy yield calculations. The problems with accurate power measurements of thin-film modules are well known. The module test-standard IEC 61646 ed. 2 tries to take these into account by demanding light-soaking and repeated STC-measurements which leads to time consuming procedures. The stabilisation behaviour over time of Isc, Voc, efficiency and filling-factor is compared under the influence of different illuminations. Therefore, IV-curves are measured with a high frequency during outdoor exposition and indoor exposition to 1000 W/m² irradiation from a class B solar simulator in a climatic cabinet under temperature-controlled conditions. The results are compared with STC-measurements after different pre-conditioning procedures. It turned out that the different module types behave differently with respect to the changes of their properties as a function of light-soaking exposure time.