The Influence of Temperature and Irradiance on Performance of the photovoltaic panel in the Middle of Iraq

The photovoltaic (PV) panels are expected to be the most important systems meet global energy demand by converting solar into electricity. main obstacle widespread deployment of PV its limited efficiency, which greatly affected radiation and operating temperature. full knowledge performance, efficiency output power modules extent their change with fluctuations temperature is necessary determine optimal size system avoid financial risks project. This paper investigated numaricaly experimentaly influence on polycrystalline in Baghdad-Iraq. PVsyst software was used simulate a model implementing simulation results presented impact variations curves I-V, P-V efficiency. In order verify reliability simulated experimental ones, several measuring devices have been conduct field experiments outdoor conditions. It were characteristics performance 120W panel for different ranges showed that current, voltage, increased increasing radiation, while they decreased except current increased. identical terms effect panel. tests when 1°C, about 0.068%, voltage 0.34%, 0.489% 0.586%. displayed parameters under real conditions behave differently than standard test (STC), as strongly weather