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The performance of photovoltaic (PV) module is affected by outdoor   conditions. Outdoor testing consists installing a module, and collecting   electrical performance data and climatic data over a certain period of time.   It can also include the study of long-term performance under real work   conditions. Tests are operated in URAER located in desert region of Ghardaïa   (Algeria) characterized by high irradiation and temperature levels. The   degradation of PV module with temperature and time exposure to sunlight   contributes significantly to the final output from the module, as the output   reduces each year. This paper presents a comparative study of different   methods to evaluate the degradation of PV module after a long term exposure   of more than 12 years in desert region and calculates uncertainties in   measuring. Firstly, this evaluation uses three methods: Visual inspection,   data given by Solmetric PVA-600 Analyzer translated at Standard Test   Condition (STC) and based on the investigation results of the translation   equations as ICE 60891. Secondly, the degradation rates calculated for all   methods. Finally, a comparison between a degradation rates given by Solmetric   PVA-600 analyzer, calculated by simulation model and calculated by two   methods (ICE 60891 procedures 1, 2). We achieved a detailed uncertainty study   in order to improve the procedure and measurement instrument

Degradation and performance evaluation of PV module in desert climate conditions with estimate uncertainty in measuring