The fan in most heaters is less than 10w usually about 6 or so. A normal single leisure battery as fitted as standard to most vans, in good condition, will run that fan continuously for at least 100 hours. Of course you will have lighting and other stuff, so half that - still 50 hours non stop. You will probably run out of gas first! Basically the heating fan does not take a lot of battery power, so don't worry.
Most vans have a 100 amp hour leisure battery - this should last at least 3 days of typical use, probably more, and as soon as you drive or hook up - it charges up again. If you spend a lot of time in the van, not hooked up and not driving, and watch a lot of TV and use a laptop a lot, then you might need extra batteries - which is a relatively simple upgrade. I have six big ones under the bed - but then I am a greedy boy!
Most vans have a 100 amp hour leisure battery - this should last at least 3 days of typical use, probably more, and as soon as you drive or hook up - it charges up again. If you spend a lot of time in the van, not hooked up and not driving, and watch a lot of TV and use a laptop a lot, then you might need extra batteries - which is a relatively simple upgrade. I have six big ones under the bed - but then I am a greedy boy!
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