Solar photovoltaic characteristics of solar photovoltaic power generation system has its unique characteristics: ① The depleted dangerous; 2 absolutely clean (non-polluting electricity, in addition to the battery); (3) not subject to resource distribution geographical constraints; ④ at the nearest power generation; ⑤ The energy of high quality; ⑥ The user is emotionally easier to accept; ⑦ to obtain the energy spent a short time; ⑧ power supply system is reliable. The downside is: ① irradiation energy density; ② The energy and the four seasons, day and night and confront weather conditions; ③ The cost is relatively high. Some of the above characteristics of the decision of the photovoltaic power supply system has its unique advantages and constraints in the application.