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Reply from Mr. Julius Tanesab
2020.11.24 00:56:18
Power produced by a PV module varies with the changing intensity of incident light. The rate of electron production by photons striking the solar cell is directly proportional to the intensity of the light. That is, as the irradiance increases, the short circuit current (Isc) and the open circuit voltage (Voc) increase resulting in an increase in the overall power (Pmax). Cloud in rainy seasons weakens drastically the incoming direct component of solar radiation reaching the surface of the module resulting in minimum output power. So the daily energy produced by the module is lower compared to cloudless days. The percentage of PV performance decreasing depends on how severe the cloud is. But, by ignoring some details, performance of a PV module can be calculated by deploying a simple formula: Energy production = capacity of the module (Wp) x peak sun hours (it can be daily, monthly, or annualy) x efficiency of the module. Peak sun hour data can be derived from meteorological agency. For Indonesia you also can find it here https://www.sciencedirect.com/science/article/abs/pii/S1364032111005703
By doing so, you can compare the performance of a PV module in different seasons.
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