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In this study is suggested a statistical approach for evaluation of the solar radiation of a 1 MWp grid connected photovoltaic system. The initial data is acquired with the help of specialized software and a measuring system. The statistical evaluations of the measured values ensure optimal design and high effectiveness of the energy systems, based on PV modules. With the help of modern technical tools is created a representative statistical database. Data for typical weather seasons was processed and analysed using specialized software for statistical estimations. As a result the numerical values of the parameters influencing the production of electricity were received. For greater clarity the results are visualized. The created models allow solving various problems associated with forecasting of electric loads. These results can also find application in the construction of smart grid systems.