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A common situation with DIY solar systems is that someone gets a 20V or 24V solar panel, and then needs to use it to charge a 12V battery bank. We demonstrate why an MPPT solar charge controller is needed to convert the voltage down and increase the current to maximize the power out of the solar panel. While a PWM solar charge controller could be used, you will lose at least half of the potential power, so MPPT is a much better solution.

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