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The price of raw materials for basic living requirements is increasing due to the quickly raising price of crude oil. The price of transportation, water and electricity and the fuel gas is being affected and getting higher as well. In this case, the green energy solar power becomes the best solution to solve this problem. In this paper, the series-parallel loaded resonant converter is used as the circuit of solar power battery charger. The parameters of the circuit are designed by using the equation derived from above circuit. The result of practical experiment can be used to verify the validity of the theory of the charger circuit. The average efficiency of charging achieved 89.6% in the experiment.