The increase in cell temperature decrease in electrical power yield and efficiency of the module are some of the common problems. That is referred as short term losses. If loss is for long term than the performance of the cell is degraded. It is dependent on environment factors like temperature, water ingress and ultraviolet intensity. The permanent structural damage caused by the development of thermal stress due to excessive heating of PV module at elevated operating temperature is known as thermal degradation of the module.
Life time and reliability are also adversely affected due to hostile weather condition, particularly high temperature. Roof top PV performance is degraded by the outside parameter like solar irradiance, ambient temperature, module temperature, dust accumulation and many more thus analyzing those effect and framing into the math model will give the solution about how to control and minimize those parameter so that performance can be evaluated to the maximum. The responsible parameter can be put into the mathematical model and analyze the effects
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