Prediction method for cleaning period of photovoltaic module

The prediction method for the cleaning period of the photovoltaic module is characterized by comprising the following steps: S1, determining the power generation efficiency reduction rate of the photovoltaic module; s2, economic loss is determined according to the power generation efficiency reduction rate of the photovoltaic module, the cost of cleaning once, the photovoltaic electricity price and the number of annual photovoltaic full generation hours; and S3, determining an optimal cleaning period x according to the economic loss. According to the scheme, the condition of power generation efficiency along with time can be accurately predicted based on various working parameters (reference parameters such as irradiance, actual power generation power and temperature coefficient are accurately selected in the scheme) of the power station, and parameters such as cleaning cost, power generation income and electric loss are considered; according to the method, the change curve of the economic loss along with tim