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Open Roads Forum  >  Tech Issues

 > How long does your Suburban furnace run off of 12V?

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vladio

lancaster

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Posted: 08/30/09 07:45pm Link  |  Quote  |  Print  |  Notify Moderator

I have a pop up camper with a 16K btu suburban propane heater - bought it just before memorial day so I haven't used it yet. The other day I turned it on just to keep the bugs at bay in the unit. It fired up and ran well. I realized that I hadn't had the campers electric plugged in so I then realized that it does run off of my 12v deep cycle battery - the blower fan that is.

Anyone have experience with these? How long will this run off a battery?

I'm aware of the inherent differences with temp and how long the unit has to run to keep a temp so I'm not looking for exact figures. I camp in south central Pennsylvania so it will be used at night where the temps might dip into the 50's (at least for the next few weeks).

luck would have it

Dimondale (Lansing), MI

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Posted: 08/30/09 07:51pm Link  |  Quote  |  Print  |  Notify Moderator

We go mushroom camping every spring for mothers day. Using the battery for the Furnace, lights, fridge and water pump our single battery will get us through the weekend with the furnace running much of the night....55/60° at daytime 40° at night.


Dave
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pkunk

Questa, NM

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Posted: 08/30/09 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

It really has more to due with the size (amp hrs) of your battery and the number of hours the furnace will run. Impossible to figure without more info.


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stevesandidge

kingsport tn

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Posted: 08/30/09 07:56pm Link  |  Quote  |  Print  |  Notify Moderator

depends on the battery. a couple of 6 volt batts in series will last ya longer than a single 12 bat. a group 27 has a higher amphour rating than a group 24.
if you are gonna do much dry camping, you may want to invest in a solar panel for your roof, or one of those nice quiet genny's to run and recharge your bats.
steve


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pianotuna

Regina, SK, Canada

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Posted: 08/30/09 08:46pm Link  |  Quote  |  Print  |  Notify Moderator

Hi vladio,

The blower fan may draw about 15 amps when it is running.

Find out the size of your battery in amp hours. Divide that number in 2. Then divide the result by 15. That will give you a guesstimate of how long the furnace will run if it is on constantly.

Solar panels are a wonderful add on to most RV's

vladio wrote:

The other day I turned it on just to keep the bugs at bay in the unit. It fired up and ran well.
Anyone have experience with these? How long will this run off a battery?

I'm aware of the inherent differences with temp and how long the unit has to run to keep a temp so I'm not looking for exact figures. I camp in south central Pennsylvania so it will be used at night where the temps might dip into the 50's (at least for the next few weeks).



Regards, Don
Kustom Koach Class C 28'5" 256 watts solar, 875 amp hours in two battery banks 12 volt batteries 2500 watt inverter.

vladio

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Posted: 08/30/09 08:46pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks guys. I know it's impossible to get exact or even close-to-exact figures (see my last paragraph). I'm looking more for how you use yours and a general idea of how long it runs for you and how it operates on 12V.

Luck would have it, you don't run the fridge off of 12V all weekend do you? I don't think mine would run 3-4 hours without running down to almost nothing.

pianotuna

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Posted: 08/30/09 08:48pm Link  |  Quote  |  Print  |  Notify Moderator

Hi vladio,

Your fridge draws about 10 amps when running on 12 volt DC. Do the same calculation as for the furnace to get a guesstimate.

vladio wrote:



Luck would have it, you don't run the fridge off of 12V all weekend do you? I don't think mine would run 3-4 hours without running down to almost nothing.


vladio

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Posted: 08/30/09 08:48pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Hi vladio,

The blower fan may draw about 15 amps when it is running.

Find out the size of your battery in amp hours. Divide that number in 2. Then divide the result by 15. That will give you a guesstimate of how long the furnace will run if it is on constantly.

Solar panels are a wonderful add on to most RV's

vladio wrote:

The other day I turned it on just to keep the bugs at bay in the unit. It fired up and ran well.
Anyone have experience with these? How long will this run off a battery?

I'm aware of the inherent differences with temp and how long the unit has to run to keep a temp so I'm not looking for exact figures. I camp in south central Pennsylvania so it will be used at night where the temps might dip into the 50's (at least for the next few weeks).


I've though about solar but we have small kids so we usually camp in state parks here in Pennsy and get sites with electric. Most of the places we camp are heavily shaded too.

I don't have any info on the furnace but will do the math based on your 15 amps... thank you.

mtdew999

Backwoods, Oregon

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Posted: 08/30/09 08:49pm Link  |  Quote  |  Print  |  Notify Moderator

I could probably run my furnace about 15 or 16 hours on one fully charged group 27 battery, provided I wasn't using anything else.

magic43

Brookhaven, Ms.

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Posted: 08/30/09 08:52pm Link  |  Quote  |  Print  |  Notify Moderator

When the temps dip into the low 20's and teens, I set the thermostat on 45. I then run the genny a couple of hours each day.


magic43

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