Too much money for 50w for such limited use. Solar does not cost that much.
The scenario in the OP might work with a "power box" you can take with you and bring home when visiting the storage place. You could remove the wires off the 12v battery to ensure no draw at all on it while in storage, and get your 12v and some 120v too for running things while there from the power box, which can be recharged at home. The power box inverter would run your converter to make 12v if I understand that right.
The power box might come in handy at other times too.
The Furrion connection should not limit you to one of that brand's systems. Will it adapt to other ordinary wiring?
