MEXICOWANDERER wrote:
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-3EMgMQhbOaaXObyA
BEAR 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.
You probably could use even smaller wires, since the wiring voltage drop can be compensated for at the trailer end. The wire size would be dictated by safe current carrying capacity rather than acceptable voltage drop.
For the 60A controller as described, it works out to somewhere in the vicinity of 15A, and 14 gauge wire ought to suffice...though I'd probably use 12 gauge myself.
