摘要:This article presents the performances of two grid-connected photovoltaic systems (monocrystalline silicon (m-Si) and polycrystalline silicon (p-Si)) of 2kWp each one, located on the roof of ben m'sik's faculty of sciences in the university Hassan II Casablanca, Morocco. The experimental data were recorded in the climatic conditions of Casablanca in real time from January 1st 2017 to December 31th 2017. Various settings were used in order to evaluate the performances of the two systems, including energy production, system efficiency , final yield ( performance ratio (PR) and others. The results obtained show that the total annual energy produced by the p-Si modules is 3372.38 kWh and by the m-si modules is 3418.24 kWh. The annual PR was 86.58% and 87.56% while the annual was 4.61 h/d and 4.68 h/d respectively for the p-si and m-si. The had been calculated to 12.96% and 13.16% in the same order.