This study presents a method of estimating the past total Photovoltaic Systems (PV) output results over a wide area, such as the supply area of an electric power company, and its associated precision. When estimating the total PV output over a wide area, it is difficult to grasp accurate information (PV direction, tilt, latitude, longitude, model of module and PCS, and solar irradiance incident on solar panel) for an estimate of the individual PV output. However, by using the mean as a substitute for the individual information, this method can increase the smoothing effect of the output errors and lower the total error.
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