... above 20 years, a variety of charging ways complementary, solar ,Ac and Dc all can charge for the system, one time investment, long- ... 220V 50Hz~60HZ)Characteristics:The system has high conversion of silicon solar panel, high euphotic rate and mechanical strength, good resistance to ... as the small AC/DC power supply system, for farmers in remote areas, and posts, fieldwork, small tourist camping It is ...