Might be yet another good time to point out...
There are no hints, no tips, no rules or suggestions that trump giving a system a workout in the driveway. Heater, hot water, lights, the whole ball o wax.
Two full days. Stop test on the third day.
On the second day plug in the converter ONLY as long as you would intend to run a generator to recharge the batteries. Then unplug it and resume the mock lifestyle.
Lights go dim? In your driveway is light-years easier to deal with than at a campsite.