The research focuses on the optimal design of solar PV system in binary-connection, which is called HyPV-net2. And improve the problem from the original HyPV-net2 system, including the improvement of the equipment and the software program, the format of the communications protocol, and the modification of the logic in HyPV-net2. By the simulation of Matlab, find out the optimal combination and analyze the economic benefits for HyPV-net2.