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The effect of the diffuse irradiation on the PV plants' production

In the Óbuda University we perform research on Photovoltaic Systems since a decade. For the production forecast the behavior of the PV panels in different lighting situation must be known. We investigate the whole system (PV panel + Inverter) in direct and diffuse illumination. By the analysis of the small- and largescale power plants we found that the diffuse irradiation from sunrise till sunset provides of the 25% of the generation in a full-sun day. The diffuse- and direct irradiation part can be modelled and calculated independently. The two superposed closely sinusoidal curves (not a sinus!) form a bell-shape. It makes possible that the generation prognosis can be based on the forecast of the two components.