This paper present a study of the photovoltaic generator (PVG) performance. It basing on comparison between characterizations obtained in real time test and simulated ones using mathematical models. This study is evaluated by the design of a semi-virtual laboratory, which is composed on a hardware support based on the developed data acquisition system in real operating conditions and a software support based on mathematical models descriptions. T his laboratory permits to identify PVG parameters using correlation between measurements and simulated characteristics.