The degradation of two amorphous silicon based PV modules, namely of single junction amorphous silicon (a-Si) and of micromorph tandem (a-Si/u-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, that 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 aSi module, which is 3.02% for the first year, and 0.98% for the a--Si/u-Si, which is 2.29% for the initial year.
Analysis of the degradation of amorphous silicon‐based modules after 11 years of exposure by means of IEC60891:2021 procedure 3
Piliougine, Michel
;Petrone, Giovanni;Spagnuolo, Giovanni;
2022-01-01
Abstract
The degradation of two amorphous silicon based PV modules, namely of single junction amorphous silicon (a-Si) and of micromorph tandem (a-Si/u-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, that 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 aSi module, which is 3.02% for the first year, and 0.98% for the a--Si/u-Si, which is 2.29% for the initial year.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.