Charge controllers: Rated by input or output amps???
I'm finding conflicting information on this... I'm looking at using an MPPT controller to use some cheap used 24v panels and feeding a 12v battery bank on an RV. If controllers are rated by input amperage, a 20 amp controller should be fine. If rated by output amperage, I'll need a 40. There must be a definitive answer available from this group... help! Many thanks.
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