The OP has a small TT. He doesn’t have either space or payload capacity for some of those suggested setups. The single 12 volt “marine deep cycle” battery provided with his TT is a 75 or 80 AH battery which was used in the first place because it was the cheapest battery possible.
With the (also cheap) WIFCO converter, he’s getting maybe 25 or 30 AH service out of that battery. For less than $400, he could buy a 125 AH group 31 true deep cycle 12 volt AGM and a real 30 amp battery charger to make sure it was fully charged. This would at least double his available power. Add a second such battery for another $250, and get 4 times the available power.
But even better would be just one such battery and 200 watts of solar panels. That should keep him in power indefinitely. Cost, about $650 plus installation. Operating cost, zero.
BatteryCharge controllerSolar panels
