Aad Abdullah, Ahsan AL-qamadi2020-12-172020-12-172020GM/ENR006/20http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/22316Our study concerns the performance study of the Dhaya photovoltaic power plant (Sidi Bel Abbés). This 12 MWp capacity plant is part of a national program to produce electricity from renewable energies. This study is spread over five months (March, April, May, June and July) of the year 2019; it is carried out according to standardized standards (International Electro technical Commission) IEC 61724. The results indicate that the performance index Normalized Monthly (PR) varies from month to month, it has a value of 92% in the month of March, 69% in the month of April, 78% in the month of June and 74% in the month of July. The monthly efficiency of the field (ηfield) varies from month to month, it varies between 14.92% (March) and 11.56% (July). The monthly efficiency of the system (ηsystem) varies from month to month, ranging from a maximum of 14.29% (March) to a minimum of 11.08% (July). Likewise, the efficiency of the inverters (ηinverter) of the Dhaya plant varies from one month to another, it has a maximum of 96.4% noted (April) and a minimum of 95.7% noted in the month of Marchfrcentrale_photovoltaique_panneau_champ_Dhaya_cellule_solaire_onduleureThesis