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Solar power system consists of solar batteries, solar controller, batteries (Group). Such as the output power supply for AC 220V or 110V, also need to configure inverter. The role of the various parts are:  (1) solar panels : solar panels solar power generation system in the central part of the value of solar power generation system in the highest part. Its role is to convert sunlight into electricity stored in batteries or sent to, or promote the work load. Solar panels will directly determine the quality and cost of the entire system of quality and cost. (B) Solar Controller: Solar controller's role is to control the entire system working state, and played off battery charge protection, over discharge protection role. In the larger temperature difference between where the controller should have qualified temperature compensation function. Other additional features such as light-control switch, when the control switch is the controller should be optional. (C) Battery: generally lead-acid batteries, are generally both 12V and 24V, the small micro-systems, can also be used nickel-metal hydride batteries, nickel-cadmium batteries or lithium batteries. Its role is when there is light emitted by solar panels save energy, to be released when needed. (D) inverter: In many occasions, are required to provide AC220V, AC110V AC power. As the direct output of solar energy are generally DC12V, DC24V, DC48V. In order to provide electrical power to AC220V needs to be issued by the solar power system to convert DC to AC power, so need to use the DC-AC inverter. In some cases, need to use a variety of voltage load, but also used in DC-DC inverter, if the 24VDC to 5VDC power converted into electrical energy (note that is not a simple step-down). FROM:http://zhanchang.blogtownhall.com/
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