The fridge won't last long on 12 volt. Maybe a few hours at best. I use 12 volt for the fridge while towing and propane in camp.
I don't think there is any such thing as standard battery. You get whatever the dealer put on. I had a single group 24 Interstate battery. I immediately added a second identical battery.
For just my wife and I we can go 3 days without charging the battery, assuming very little use of the furnace. More people seems to use more power, but I don't really know why.
I have a Honda 2000 that I take with me any time I will be camped more than 2 nights.
Solar is another option.
Some people report that they do not get a very good charge from the TV because the wire is too small resulting in too much voltage drop. I havn't checked mine to see what the voltage drop is, so I don't have nan opinion on that topic.
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