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Old 08-29-2013, 12:49 PM   #11
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KyDan's Avatar
Join Date: Mar 2008
Location: Louisville, KY
Posts: 5,648
I've got 2 12v plain old "deep cycle/marine/crank" and have gone
2 nights with the furnace on many occasions.
Way back when I had 1 battery I could get 1 night.
If I tried for 2 nites it would usually die in the 2nd night.

As others have said, it depends on how cold outside vs how warm you
want to be.
We use an artificial down comforter and flannel sheets in cold weather.
We usually set the t-stat for 50 ish. I will tell you 50 doesn't sound
very cold until you try it. Crawl out of a nice warm bed into 50 and it's
OTOH, we like to go camping at least once or more in the Fall/winter.
Good crisp campfire weather is nice after a long hot summer!

Happy Camping!

KyDan is offline   Reply With Quote
Old 10-05-2013, 08:35 AM   #12
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Join Date: Sep 2013
Posts: 3
I was looking at a similar issue. I'm also wanting to go dry camping but only had the one deep cycle battery. I looked up the battery specs and found that it had a reserve capacity of 160. Unfortunately, that didn't tell me the amp hours so I found this:
1.Multiply the reserve capacity by 60 to convert it to seconds. For example, if a battery offers a 100-minute capacity: 100 x 60 = 6,000 seconds.

2.Multiply this length of time by 25, which is the battery's amperage. Example: 6,000 x 25 = 150,000. This is the number of Coulombs of charge in the battery.

3. Divide this answer by 3,600, which is the number of Coulombs in an amp-hour. Example: 150,000 3,600 = 41.67. This is the number of amp-hours in the battery.

Once I had the amp hours I looked for some info on what amp hours are. This site ( has a good explanation of amp hours and battery draw.

Based on the lame batteries that came with the trailer, I decided to add another 12v in parallel, get a little Harbor Freight generator to charge them each day, and get a Heater Buddy as a contingency.

Best of luck!

oldnfat is offline   Reply With Quote

heater, batteries

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