The research focuses on the development of solar PV system for self-consumption without selling electricity back to grid. We simplify the hardware of old controller, lower the cost and improve the software and hardware of control and communication, to enhance the system stability. Combined with CCU, one system can support its electricity for another system in binary-connection, to improve the power generating efficiency of the overall system. Besides, we use microinverter with anti-reverse-current technology and electric water heater to develop the on-grid PV system with dual-energy sources, having the advantage of peak-load discharge and intelligent supply of hot water.