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Old 11-12-2014, 03:52 PM   #1
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Battery Power- How long??

Hey all, if you go camping out in the boonies, how long can you last on just battery power? Not running fridge or furnace just fan and lights
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Old 11-12-2014, 04:24 PM   #2
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Your not using fridge at all?

What size battery, brand, etc etc?


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Old 11-12-2014, 05:06 PM   #3
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Caver, you have a two, 12v battery config?
We dry camp a lot and can help with some ideas on how to conserve and still have all the comforts
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Old 11-12-2014, 05:07 PM   #4
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Knowledge is key to getting a good estimate.

You need to know the amp draws of each of the items running off the battery - and how many hours of a day they will be on.

Total up the number of amp-hours used in a day. Compare to half your battery's rating in amp-hours. Do not plan on discharging your battery more than 50% (why you used half of its rating) to keep its life expectancy reasonable. This assumes a deep-cycle battery - a starting battery (normal car battery) has a much lower tolerance for being cycled down to 50% charge.

Usually the number of days your battery can support will be less than you want. There are 3 ways to resolve - use less power, install more battery capacity, and/or add solar or other generating capacity.

In our case, the desire was to keep the A-frame at 50-55 degrees with outside temps in the 40s during the day and high 20s at night. The heater fan was/is the driving load since our camper came equipped with LEDs for the interior lights. Our calculation was that a single battery was not going to cut it for 4 days/3 nights. So we added a second battery (size 24 semi-deep-cycle) in parallel when we took delivery.

We have been successful for a single night - all our multi-night campouts in cold temps have been with shore power so far. We may find out more this coming Spring.

I also need to take measurements with a meter to make more calculations. I think the parasitic load (CO/LP detector, thermostat?, power-off on stereo, etc) is higher than I would like.

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Old 11-12-2014, 09:43 PM   #5
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With heater running on 25-30 degree nights to keep the chill away, LED used on the inside; two deep cycle 27 batteries, easily three nights with no help from the generator. Maybe longer, no use pushing it, and that was before I installed the trimetric meter. But fourth day I connected the battery charger and charged them both up.
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Old 11-12-2014, 10:08 PM   #6
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When I dry camp I have no problem making it through the weekend with two batteries. I run the fridge off the gas and only have a light on when I need it. I also make sure I turn the water pump off when I'm not running any water. As long as you aren't wasteful with your power you should be OK.
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