The characteristic of this system is that it uses DC loads and has no special requirement for service time. The loads mainly used in daytime, so the system doesn’t include storage battery, also it does not need controller, the system is simple. PV module is used to directly supply power, leaves out the trouble of depositing and releasing energy process in storage battery, and saves the energy loss of the controller; it improves the energy utilisation efficiency. Commonly, it is used in PV water pumping system, several daytime temporary electric equipment and some tourist facilities.


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