When a photovoltaic system is used as black-start unit, it can be considered as a special islanding condition. This paper simulates the output characteristics of photovoltaic array under various temperature and intensity of illumination, based on which a control strategy for black start is proposed and then the influence of the battery configuration and environment variation are analyzed. Results indicate that the control strategy can adapt to different environment condition. Moreover, battery capacity and environment variation will affect the stability of frequency and voltage as well as the time duration of black-start process. Based on the simulation results, application prerequisite for using photovoltaic system as black-start unit is proposed, which can be a reference for restoration planning and field testing.