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An outdoor experimental study was carried out to investigate and compare the   performance of three commercially available photovoltaic modules   (monocrystalline, polycrystalline and single junction amorphous silicon)   under the weather of Pakistan for the month of January. Power output   efficiency, module efficiency, and performance ratio are calculated for each   module and comparison is presented. Results have shown that mono-crystalline   and poly-crystalline modules perform better at high irradiance and show poor   performance in low irradiance conditions. Amorphous solar module has shown   better light absorption characteristic and performs better in low irradiance   i.e. in cloudy and diffuse sunshine conditions. Monocrystalline photovoltaic   module is found to be more efficient, having module efficiency of 13.5% which   is higher than the other two modules. Furthermore the power output of   mono-crystalline and poly-crystalline modules has shown a higher decrement at   higher module temperatures compared to the amorphous solar module. Because of   better performance in low solar irradiance, amorphous solar module has shown   monthly average performance ratio of 1.07 which is higher than other   photovoltaic modules under study

An experimental investigation of performance of photovoltaic modules in Pakistan