说明：  Standalone Photovoltaic (PV) system requires a proper battery charge controller. In this paper an efficient battery charge controller using Buck-Boost regulator with Maximum Power Point Tracking (MPPT) is presented. The voltage command is determined by both the PV panel maximum power point tracking (MPPT) control loop and the battery charging loop. Here the controller is designed so as to balance the power flow PV panel to the battery and load such that the PV power is utilized effectively. The design and simulation using MATLAB is presented in this work.