Analysis of the degradation of amorphous silicon‐based modules after 11 years of exposure by means of IEC60891:2021 procedure 3

Abstract

The degradation of two amorphous silicon‐based photovoltaic (PV) modules, namely, of single junction amorphous silicon (a‐Si) and of micromorph tandem (a‐Si/ μ‐Si), after 11 years of exposure in the south of Spain is analyzed. Their I‐V curves were measured outdoors to study the changes of the electrical parameters in the course of three different periods: during the initial days of exposure, during the first year, and in the subsequent 10‐year period. The translation of the curves to an identical set of operating conditions, which enables a meaningful comparison, was done by the different correction procedures described in the standard IEC60891:2021, including the procedure 3, which does not require the knowledge of module parameters, whose values are typically not available. The annual power degradation rates over the entire 11‐year period are 1.12% for the a‐Si module, which is 3.02% for the first year, and 0.98% for the a‐Si/ normalμ‐Si, which is 2.29% for the initial year.

Systematic Experimental Evaluation of Submilliwatt PV Cells for Indoor Applications

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Multi‐pronged degradation analysis of a photovoltaic power plant after 9.5 years of operation under hot desert climatic conditions

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Performance and degradation analysis for different solar photovoltaic technologies under hot and humid environment: a review

“…Two a-Si based PV modules exposed to a tropical area in Malaga for 11 years showed annual power degradation rates of 1.12%, with 3.02% observed in the first year. An a-Si/-Si combination had an annual deterioration of 0.98%, with 2.29% degradation in the first year, mainly caused by the Staebler-Wronski effect [129]. Field data was utilized to determine the acceleration factor for multi c-Si cells, and a linear model estimated the DH1000 degradation threshold equivalent to 25 years of field exposure.…”