We know that in order tocharge the solar battery, the output voltage of the solar panel must be higherthan the current voltage of the battery. If the voltage of the solar panel islower than the battery voltage, the output current will be close to 0.Moreover, the output of solar panels is not fixed, but varies with theconditions of radiation intensity, ambient temperature and so on.

       PWM solar charge controller has set parameters (or constant voltage, or constant current) totransfer the power of the solar panel. Easy to cause the battery always in astate of full dissatisfaction, on the other hand, in good weather can’t makefull use of solar panels, resulting in waste.

       In an independent photovoltaic system, the cost of solar panels and batteries accounts for 80% -90% of the whole system, and the solar controller only accounts for 5% - 10%.However, the MPPT solar charge controller can optimize this system and play an importantrole.