It has been a pressing challenge for human beings to reduce the energy consumption of buildings and decrease carbon emission. The application of photovoltaic (PV) system in buildings is identified as a renewable energy and carbon reduction approach. As a kind of typical building, the gymnasium usually has a large non-occupation roof area, which shows great application potential to cover the building demand by available photovoltaic source. This paper presents the performance of a grid-connected system integrated photovoltaic, battery storage, and electric vehicles (EV) applied in gymnasium buildings. The main building demand of gymnasium buildings can be easily covered by adopting an appropriate size of PV installation and battery capacity. The load cover ratio can achieve 0.95 when PV generation equals the energy consumption of the building and the battery with 2.7 times capacity of average daily building load is equipped. The proposed charging strategy for EVs can significantly decrease the peak power of the system compared with the constant power charging method. The peak grid power of the system adopted with the proposed charging strategy can be decreased by 51.7% of the rated load power on a typical day when PV generation is 1.4 times the energy consumption of the building and the battery capacity is 66% of the average daily building load. The results of this study show a reference for the configuration and operation scheme of PV system and electric vehicles in gymnasium buildings for renewable energy development and zero-carbon activity.