Solar Photovoltaic (PV) energy generation will be one of the main energy generation technologies in the inner future thanks to the recent and significant reduction of involved costs. One of the most promising and lowest cost technologies is the thin-film PV modules technology. Their currently lower performance than single-Si PV modules is compensated by their lower costs and more aesthetical display, which make them especially attractive for building integration. However, because of the novelty of this technology, very few studies have been conducted to analyse its aging and degradation, which has a significant impact on the operation and maintenance needs and, in the end, in its Levelized Cost of Energy (LCOE). Thus, in this work, a systematic review on this technology and on its more frequent faults and degradation effects is conducted first. Then, a set of Copper Indium Gallium Selenide (CIGS) PV modules has been tested under real outdoor conditions and its degradation has been analysed after 3 years operation. A new procedure for faults location and quantification has been established for this sort of PV modules; and early degradation and aging data are presented and analysed. Results show a significant early degradation of this technology and a fast expansion of the PV faults.
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