PWM solar charge controller which stands for pulse width modulation, is one of the mainstream technologies used in the controller. In essence, it is a switch for the solar arrays and the batteries, which pulls down the voltage to be close to that of the batteries. So chances are if you use a 60 cells panel to charge a 12 volt battery, The panel can’t output 100% energy as it should be. Therefore, you need to make a precise calculation of the system in which your batteries working voltage should be close to that of the solar arrays. Advantages? Lower costs.

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