A photovoltaic array is the complete power-generating unit, consisting of any number of PV modules and panels; PV provides a suitable energy source for remote (either cold or more temperate) regions, the purpose of this research is to determine the ideal tilt for solarphotovoltaic (PV) modules in Nasiriya, Amara, and Basra which are threecities in southern Iraq. In this work, PVsyst program is used to estimate theangle for the annual irradiance, summer, and winter weather conditions.In addition, and this work was done in the Nasiriya,Amara has a solarphotovoltaic (PV) system with a 10kWp output; the cited example in Basra is an ETSolar 255W PV panel. A Huawei SUN2000-10KTL-M2-380V 10KVAinverter was used in the used of this ON grid PV application. The obtained results for Annual yield, summer yield, and winter yield for PVmodules in the city of Nasiriya are 31, 13, and 49 degrees, respectively. Thereare 30, 14, and 50 degrees Celsius in the city of Amara. in the city of Basraare 31, 13, and 52 degrees. Finally, in this work the annually, Nasiriyacontributes 17941 kWh to the grid, Amara 18175 kWh, and Basra 17531kWh. The results reveal that the estimated yearly optimum tilt angle is approximately equal to the latitude of the studied cities in Iraq.

Solar radiation, solar PV, modeling, optimum tilt angle, maximum power generation.