Advanced Intercomparison Testing Of PV Modules In European Test Laboratories

Herrmann, Werner and Mau, S and Fabero, Fernando and Betts, Thomas R and van der Borg, N and Kiefer, K and Friesen, Gabi and Zaaiman, Willem (2007) Advanced Intercomparison Testing Of PV Modules In European Test Laboratories. UNSPECIFIED. In: 22nd EUPVSEC.

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The EC-funded Integrated Project PERFORMANCE, which commenced in January 2006, includes a subproject devoted to improving the comparability of PV module performance measurements among European test laboratories and to elaborating guidelines for harmonised measurement practices in the PV industry. Recently published results of international round-robin tests with PV modules revealed measurement differences between laboratories 1,2,3 that proved to be significant for thin-film and multi-junction devices. This shows a clear need for the development of new and adapted measurement procedures suitable also for use in the PV industry. In this context, comprehensive intercomparison tests with PV modules have been performed that reflect the state-of-the-art of present PV technologies. Specifically, several high efficiency c-Si technologies were studied for which problems are known to occur in measurements with pulsed solar simulators 4,5,6,7. Of significance is that for the first time our investigations were not restricted to the comparison of STC performance data but also were aimed at understanding and analysing measurement effects. Consequently technology-specific measurement programmes were defined, such as variation of the measurement parameters of the solar simulator and preconditioning by light exposure. In addition, we have documented the variety of measurement equipment (i.e. solar simulator performance) and techniques in use. This paper presents the results of the first round robin performed with 5 PV module types covering the range of commercially available crystalline silicon cell technologies (size, wafer type, high efficiency). Our studies revealed a 2{\%} spread in maximum power for the 6 participating test laboratories. The resulting database will assist laboratories in further developing their measurement hardware and techniques. Guidelines and adapted measurement procedures for the PV industry can also be elaborated.

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