I dont know the exact amount but he said it was well over 3 grand.
This is just a weekend getaway a few times a year so he dont want to
pay for the service and pay a monthly bill too. He said his battery
setup is just fine if only he could get bulbs that dont drain the
battery so fast. He has a RV thing that charges 2 batteries so when
he needs a charge he puts the battery in his pickup, and has quick
clip on cables. It really is a decent setup for little money
invested.

Add a couple marine batteries and if a truck can get to the cabin
charge directly from truck using cables to home.or a generator with
both 12 volt and 120 outputs.

a larger battery bank will have greater capacity. .