Am I able to charge a 48 Volt battery bank (Four 12V batteries connected in series) with two 12 volt solar panels with a 75/15 MPPT charge controller in between?
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Two 12V Panels, MPPT controller, charging a 48 Volt Battery Bank
No, the MPPT controller is a Buck converter not a Boost converter. It cannot "step up" the PV Voltage.
PV Voltage must be higher than the battery Voltage.
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