through the analysis&research of load characteristics of DC refrigerator,proposing a photoelectric complementary control scheme between battery which can be with solar charge and switch power supply, and later update and improved it. Through the design of soft and hard ware, producing controller.Practical operation proves that the controller helps the better usage of the solar energy, to make battery charge and load management scientific and reasonable, to get more energy saved, to make refrigerator function more stablized and reliable.
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