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Old 12-10-2014, 01:17 PM   #1
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Furnace running on battery

How long will my battery run the furnace when not connected to electricity? Is it reasonable to assume it would power it for a night stop over, and then after a days driving and charging from the tow vehicle, power it for another night. This would be without using any other draws such as lights and such. Have Rockwood Minilite 2109S with single 12 volt battery.
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Old 12-10-2014, 01:20 PM   #2
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I have 2 batteries and can get one night without a problem. My fiends with one battery usually have a dead one by morning.
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Old 12-10-2014, 01:32 PM   #3
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Furnace running on battery

Hmmm, I thought with the furnace coming on and off, and the fan being the only draw, that it would last longer than that. Maybe I am dreaming.
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Old 12-10-2014, 01:38 PM   #4
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My 1 battery will not power the furnace over night on a cold nite.

We use a Big Buddy heater when dry camping......with windows cracked open, of course.
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Old 12-10-2014, 01:40 PM   #5
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With one battery the furnace will pretty much kill it overnight. Two should suffice fine.

There's an easy way to find out, try it at home. Set the furnace to 50* and let it run overnight. Get up at some point through the night and check the voltage, batteries aren't very happy after being sucked below 12.00V.

As for charging it, yes it will, depending on how far you drive. The charging circuit isn't really meant to recharge a dead battery, it will top one up, but not completely charge it unless it's connected for a long time.
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Old 12-10-2014, 01:41 PM   #6
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I've gone several days like that dry camping. Running gen a few hours each evening to charge battery then furnace would cycle all night.
There are so many variables. 1. Outside temp. 2. Thermostat setting. 3. Size of furnace. 4. Square feet of RV to be heated. 5. Size and condition of battery. 6. Other items drawing on battery. 7. Battery charge at beginning.
But yes, it can be done if all factors at in your favor. Good luck .
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Old 12-10-2014, 02:51 PM   #7
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When I'm dry camping and it's cold enough for heat, I run my Yamaha 2400 gen all night long. It uses exactly $2.21 in fuel at current prices and my batteries remain fully charged. Makes me a happy camper.
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Old 12-10-2014, 03:47 PM   #8
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When I'm dry camping and it's cold enough for heat, I run my Yamaha 2400 gen all night long. It uses exactly $2.21 in fuel at current prices and my batteries remain fully charged. Makes me a happy camper.
Well that's certainly oneway if you where boondocking and nobody around me I would do the same if I had one. Some generators are pretty loud.....
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Old 12-10-2014, 03:50 PM   #9
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Quote:
Originally Posted by rotorhead1250 View Post
When I'm dry camping and it's cold enough for heat, I run my Yamaha 2400 gen all night long. It uses exactly $2.21 in fuel at current prices and my batteries remain fully charged. Makes me a happy camper.
since dry camping is camping in a campground without hookups, what campground allows you to run the generator all nite? i've never heard of any campground that allows that.

unless you mean boondocking, which is camping in undeveloped areas, where you could do that.

to the OP, you'd be lucky to go one night on a Group 24 battery, running the furnace.
we rarely camp with any hookups so we have a dual battery setup and a Honda 2000.

and as was said, expecting your tow vehicle to recharge a depleted battery is not realistic.
one, most tow vehicles supply only a trickle charge while towing. and if the battery is dead, you'd have to drive over 12 hours probably to get it anywhere near full charge.
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Old 12-10-2014, 03:53 PM   #10
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With one battery the furnace will pretty much kill it overnight. Two should suffice fine.

There's an easy way to find out, try it at home. Set the furnace to 50* and let it run overnight. Get up at some point through the night and check the voltage, batteries aren't very happy after being sucked below 12.00V.

As for charging it, yes it will, depending on how far you drive. The charging circuit isn't really meant to recharge a dead battery, it will top one up, but not completely charge it unless it's connected for a long time.
That brings up a good question do you know how many amps are sent to your battery by your alternator? Always wondered that. In the Marine industry they have alternators that will put out 125 amps. For shorter engine running time on a sail boat. It also would replace the one on your TV. I have never measured it, Just wondering if you know?
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