A big part of what makes an RV self-contained is its battery.
Some RVers say one 12 volt battery will last them about 48 hours if they don’t run the furnace, carefully use the lights and water pump and otherwise conserve power. Some even use candles or go to bed early.
Once, when a storm knocked out power lines, Fran and I managed for about 15 hours in our fifth wheel with some furnace use (it was cold out) and modest use of lights. We have two 12 volt batteries.
How long your RV battery or batteries will sustain you depends on how well you manage power usage. Try disconnecting from shore power to see how long you can go before you need to. Don’t completely discharge them though, it’s not good for them. – Steven Fletcher
Learn more about RV 12 volt systems at RVbasics.com
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