Ok, I will add my thoughts, when we get to a campsite that has no electric, I find that the battery is not fully charged. That is from running the fridge, and fan. I think the problem is that the battery is so far from the alternator in the truck. (Voltage drop)
We have only one 12 V battery but it is the bigger one. I simply plug the TM into the Yamaha EF 1000 is. We run it for a while on low quite speed. It operates the water pump, and any lights that we may need. At the same time it gives the battery a full charge. We have no problem with then running on just the battery with heat for the night. Yes the TV is on, but it will operate on 12v. The Yamaha is actually lighter then another battery, and can be carried in the TV.
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