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Comparison of indoor and outdoor power measurements of thin film modules

: Wirth, J.; Kratochwil, S.; Philipp, D.; Weiss, K.-A.; Koehl, M.


Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Fraunhofer ISE ()

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.