Here is a 55 volt max input voltage solar controller to sixty amperes capacity. Smart charging.
https://www.ebay.com/itm/NEW-20A-30A-60A-PMW-Solar-Panel-Charge-12V-24V-LCD-Battery-Regulator-Controller/132046821183?hash=item1ebe9a973f:m:mSp7lk-3EMgMQhbOaaXObyABEAR IN MIND
Both the positive and the negative output wires from the underhood booster have to pass to ANY TYPE OF receiver unit near the house batteries.At 55 volts wire with only 25% of the circular mill conductor size needed for 12 volt charging is required. WHY IS THIS IMPORTANT? Instead of running FOUR GAUGE CABLES back to a fifth wheel battery bank, TEN GAUGE wires are used to achieve exactly the same capacity.
