In this paper has been studied about design and implementation of battery charging system. This system applied for buck-boost chopper as power transfer. A method to receive a maximum power from power to voltage curve in photovoltaic (PV) is called maximum power point tracker (MPPT). Incremental conductance (IC) current control method is used in MPPT which is derived from perturb and observed (P&O) method. A model has been analyzed and simulated on Power Simulator software also with the hardware implementation using dsPIC30F4012 have done. Finally, laboratory test to charge 2 and 3 batteries have been done to verify this method. From the experimental result, efficiency of the proposed control system from PV or sun energy to electrical energy are 59.21% for 2 batteries and 58.38% for 3 batteries (comparison between maximum power in parameter with P in), and the converter efficiency are 74.03% for charging 2 batteries and 84.20% for charging 3 batteries (come from comparison of P in and P out).
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