Like all questions, the answer is "it depends."
Mostly on the furnace and how cold it is. One battery per night is the general rule of thumb.
The techy answer is to add up the amp hours you're going to use and compare that to your battery capacity.
My deep cycle is 100 amp hours, I want it to live a full rich and satisfying life so I will use only 50 amp hours before recharging. I think a furnace fan is about 6 amps so it it would run the fan about 8 hours. Or 25 hours of a 2 amp light bulb.
Joel
What kind of power do you need? The heater is the one that sucks up the most power that most people use. If your fridge has a 12v option it will suck a battery dry in a half hour or less so don't even think of running a fridge off of 12v. When I was in my popup I had lights and a heater and I could easily go all weekend no problem with the heat around 50ish at night. It took the chill out while sleeping and then I'd bump it up before I went to bed or after i woke up. I would turn the heat off during the day. In my RV I can run my lights and water pump no problem all weekend (My furnace is broken and doesn't work 🙁 ) I use a Mr. Buddy Heater that only burns propane and doesn't need a battery.
Matt O 2006 Skyline Nomad 27' travel trailer. Previously owned 1986 Coleman Columbia / 1992 Coleman Senecca / 1989 Born Free Class C RV.
Percy Jack, we need more info. you don't have what kind of camper you have, in your sig line. needs of a TT or HTT, would be different than a popup.
we dry camp nearly all the time in our HTT. we have two deep cycle batteries, an 400w inverter to run the tv/dvd/ and a Honda 2000 generator to recharge the batteries.
if you have a popup, your battery needs are simpler. but if you use the furnace all night, the single battery will be dead by morning. if you plan on doing a lot of dry camping or boondocking, a second battery or small inverter generator is necessary.
by the way, Dry Camping and Boondocking are somewhat different.
generally, dry camping is when you camp in a developed campground, that has no hookups.
generally, boondocking is camping in un-developed areas, such as the desert or BLM land.
in California, less than 1% of state park campsites have hookups of any kind. so we're used to dry camping but still have the numbered sites and a bathhouse/ restroom available.
if we boondocked, we'd head out to National Forest land or BLM land and just find any place that we could park the trailer, to camp.
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