Tetsuyuki Ishii, Takumi Takashima and Kenji Otani Long-term performance degradation of various kinds of photovoltaic modules under moderate climatic conditions Progress in Photovoltaics: Research and Applications 19
In this study, we show the results of outdoor exposure test in which the performance of 14 PV modules composed of five different kinds made by six different PV manufacturers have been measured since July 2004. The average performance is calculated in each year from 2005 to 2008, and the performance degradation is quantitatively evaluated. The results are that the magnitude of the performance degradation can be clearly classified by the kinds of the PV modules.
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