The light induced degradation of amorphous silicon photovoltaic modules is a big issue formanufacturers of this technology. The Staebler-Wronksi and annealing effects describe this reversible processcausing the degradation of power that results in a loss of efficiency. Under outdoor conditions the situation is morecomplex and there are factors that determine the final extent of the degradation. This work is focused in the effect ofclimatic conditions on the degradation process. Four batches of industrially manufactured a-Si:H photovoltaicmodules with different sets of process parameters for the deposition of layers have been deployed in the four seasonsof the year for an extensive study of the LID under different climatic conditions. Through this testing, the extent ofthe LID caused by Staebler-Wronski effect is characterized by means of the characteristic parameters of the modules.
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