We are now storing our RV on our remote property and saving $85 a month in storage fees. We tested running the air-conditioning with a construction generator that was left in the house we purchased about 30 miles from the property. This solar now allows us to keep the refrigerator running and leave at least drinking water inside. And with the construction generator we can cool down the RV inside in under 15 minutes to take a break from the Tennessee heat and humidity during the summer when we are working on the forest. I've been making progress on the invasive species and clearing the logging (skidding) trails. This solar installation will give me a nice place to take a break and get a nice cool drink.

In general the recommendation is to replace your RV's on-board charging system but it is not an absolute requirement. A lead acid battery charger will not bring a Lithium battery to full charge, nor will it keep it as healthy. We will have a Victron SmartSolar 100/20 MPPT charger that will properly maintain the battery on the majority of days, so replacing the onboard charger is not as urgent. If we were going to be traveling with the RV all the time, and would not have the MPPT, I would make changing the onboard charger a higher priority. At this time we will use the VICTRON and see how it goes.

Total cost
$140 $35 per panel (four used panels from FB Marketplace)
$230 Home Depot for miscellaneous connections, fuses, wire
$551 Two EG4 12v Lithium 100AH batteries from Signature solar and
Black and Red 2 AWG cables for connecting batteries (Clearance sale for batteries)
$121 Victron SmartSolar 100/20 MPPT (includes tax, shipping)
$ 15 Amazon extra RV Battery Box https://amzn.to/4du3SmH
Free Scrap wood from local construction dumpsters for saw horses