Abstract: This paper proposes a calculation method for solar vehicle energy consumption by combining environmental parameters, vehicle shape, and actual electricity consumption. Based on typical meteorological data, the annual performance simulation of solar vehicles is conducted. The results show that compared with conventional electric vehicles, when the photoelectric efficiency of photovoltaic panels is 24.4%（the highest efficiency of single crystal silicon module in 2021）, the annual charging volume of solar vehicles in Beijing decreases by 78.8%, and the annual charging times decreases by 81.2%; the annual charging volume in Kunming is reduced by 96.2%, and the annual charging times is reduced by 96.6%. when the photoelectric efficiency reaches 28.0%, the annual electricity demand of solar vehicles is met without charging from the grid in Kunming. In addition, this paper also analyzes the impact of different parameters on the power generation of vehicle PV systems and the cost of vehicle PV systems. The best parking direction of solar vehicles in Kunming is about south by west 70°.