A photovoltaic (PV) system with batteries (BTs) is expected to be an effective system for coping with the energy issues that we will face in the future. This paper establishes an energy system with PVs and batteries in order to improve the utilization rate of the power supplied from PVs and batteries to on-premise loads. An external transducer is used to measure the power received from the utility grid. Depending on the measured receiving power, constant receiving power control and power factor control functions for power conditioning systems (PCSs) are utilized to improve the power utilization ratio. The effectiveness of this system will be verified using actual equipment.