Environmental conditions such as wind, temperature and humidity affect the\namount of solar irradiance received by the photovoltaic (PV) cells and thus\nhave a significant effect on the PV output efficiency. This paper aims to analyze\nthe power efficiency of Polycrystalline Silicon solar cells under Chinaâ??s\nweather considering these environmental conditions. Performance of the Polycrystalline\nsolar panel is analyzed through eight months of data emphasizing\nthe maximum, average and minimum temperature acquired from a solar\npower plant installed at Taiyuan University of technology, China consisting\nof 78 PV panels with a total rated capacity of 20 KW and average module efficiency\nof 16.56% at an ambient temperature of 25Degree. The results of our practical\ninvestigations show that polycrystalline solar cells in October yield the\nbest monthly average efficiency of 35.6% at an average temperature and humidity\nlevel of 14DegreeC and 44%. In comparison to a maximum temperature of\n27DegreeC and humidity of 66% in summer, the efficiency is found to drop by 5%.\nAlso, the power produced in winter at minimum temperature and the efficiency\nshowed a decline of 15% compared to that of October. Consequently,\nthis investigation leads to a conclusion that the increase in temperature and\nhumidity together is found to have a negative effect on the efficiency whereas\nthe increase in irradiance and wind speed showed an improvement in the\noutput power of the polycrystalline solar cells.
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