Stop in for a cup of coffee

No...Not until Spring or if you come up here we have a warm garage.

I bought a conversion Van that has a Power inverter with 4 extra batteries. Things are unhooked and I don't want to blow things up and I want to add a solar panel
All 12 volt batteries? Are they isolated? Non isolated batteries all need to be the same cca’s.
Going to need a big panel to maintain them.