The fridges will suck up some power. If its similar to the 120v fridge and pulls 5amps using 12v (my example through inverter), with a 200amp deep cycle you can use up to 100amps, which means just running the fridge will use all battery power in 20hrs (100amp hours/5amp used an hour = 20hrs).
If you are boondocking and not plugged in, I would definitely consider additional power generation methods. Solar, generator or running the Greyhawk (alternator charging house battery). If you go the solar route, consider where you are parking. If you are under trees or in the shade you may want to add ports/plugs to the solar charger for a portable solar panel instead of an additional panel on top. Adding a panel on top does no good if either one is in shade. Having the solar ports on the side of the RV lets you move portable panels around to get sun. You can always run the Onan or Ford engine for to charge as well, just be mindful of gas. My Onan uses 1/2 gallon an hour under medium loads.
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2018 Jayco Greyhawk 31FS
2023 Wrangler 392
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