Can propane heater run off the battery?

We borrow 12 V from the 2 duramax batteries via a # 2 guage set of 12 foot jumper cables .
we upgraded the TV batteries to AGM which have a much better recovery rate and will take a farther "drawdown" than conventional batteries .
i bought 2 exide EDGE AGM batteries for $ 140 each from BiMart .
The TT has 2 group 27 conventional batteries but a better setup is two 6 volt GC-2 batteries ( costco & sam's ) .
Using the # 2 Jumpers , with 4 batteries hooked up you will make it through the night with the furnace .
you will need to recharge them all in the morning in winter .

darsben wrote:
remember the batteries must have sufficient capacity to keep the furnace motor spinning at the correct RPM otherwise the sail switch will not engage and the flame will not come on. This has happened to me on very cold days when the furnace has run frequently at night. Luckily I have a gen set that starts from inside.

Okay, you answered my above question. 95% of the time we are hooked up to electricity, but we find ourselves doing more and more boondocking. At some point, it would be nice to upgrade to a camper that is designed for 4 season camping. Our trailer is paid off, so I hate the idea of buying another trailer, however, the current trailer doesn't have an insulated floor, poor insulation in the walls and ceiling, and lacks battery and propane storage!

Thanks everyone for your responses. You verified what I "thought", but wanted to make sure. Our trailer has a single battery, so I think I would be limited to the length of time the heater could fully operate. Would I trigger the breaker or blow a fuse if the battery wasn't making sufficient power to operate the blower fan? Or would my fan begin to spin slower and become less efficient?

remember the batteries must have sufficient capacity to keep the furnace motor spinning at the correct RPM otherwise the sail switch will not engage and the flame will not come on. This has happened to me on very cold days when the furnace has run frequently at night. Luckily I have a gen set that starts from inside.

I've run mine off the batteries many times. Just charge the batteries back up in the morning.

Typical RV Furnace is ALL 12V DC

They are a battery hog and can run a battery down.....just need a means of charging battery

Conventional RV furnaces run on 12V. Make sure you have enough capacity for your use. A generator would afford 24/7 furnace use but you'll have to run it a couple of times/day to keep a single battery charged.