The research focuses on the analysis and the improvement of the solar micro-grid. According to the data of the solar micro-grid with two hybrid solar PV systems, called HyPV-net2, which is already built and run, randomly pairing two individual systems may not always have benefits. Therefore, the research aims to create a pairing simulation program of HyPV-net2 to find out the benefical combination. Also, based on HyPV-net2 system, develop the solar micro-grid with four hybrid solar PV systems, called HyPV-net4, and create its central controller and controlling program to operate actually at experimental place.