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Old 01-31-2016, 06:57 PM   #1
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Battery size recommendation

Hi all,

I bought a small 14' foot travel trailer at the beginning of winter. It did not come with a battery or a propane tank. I am not sure what size battery I need. I don't plan on doing any "Boondocking", so I don't think I should go overboard with the biggest size battery I can buy. I've read about all the different size & type of batteries, such as Marine, deep cycle. And then there is group size 24 & 27. I've tried to read about this online, but there seem to be a lot of conflicting info on the web that makes my head spin. I would like to get everything hooked up to make sure the (propane) heater & stove works.

Also, the is a green connector on my positive batter cable that I am not sure what it's for. see pic's

Thanks,
Paul
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Old 01-31-2016, 08:11 PM   #2
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I'd buy as large a deep cycle battery I could. Your refrigerator and furnace are probably the main battery draws. If you replace the interior incandescent light bulbs with LEDs, they won't draw much power. How are you going to charge the battery? Do you have a converter/charger or just a hook up to the tow vehicle alternator? Is your trailer equipped with electric brakes? Is this battery also going to be powering the break-away function of the brakes?
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Old 01-31-2016, 08:17 PM   #3
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If you are not planning on dry camping and will most always have shore power, just get a marine type battery from Walmart or AutoZone or similar. About $100.00 and you are good to go.

If sometime in the future you decide on more dry camping, then get educated on other battery options, chargers, solar, etc.
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Old 01-31-2016, 08:18 PM   #4
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Battery size recommendation

There really isn't much price difference between group 24 and group 27 and group 31....so why not go with the higher capacity battery?

I agree for your use you don't need a premium deep cycle battery. These are all ok choices....for $100 don't worry too much about the choice...get out there and do some camping !

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Old 01-31-2016, 08:20 PM   #5
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I would go for a pair of 6v 225 AGM along with 200-400 watts of solar on the roof... I would look at getting/making a box that would fit on your tow fork... You could try to design room for one LP tank tandem to a box that could hold the two AGM batteries stacked one on top of one another...
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Old 01-31-2016, 08:31 PM   #6
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Do you have a gas furnace? Will you ever camp without power? If the answer is no then get a deep cycle or marine hybrid group 24. If you have a gas furnace and/or might camp a few nights without hookups then get the largest battery that will fit in the tray, that will probably be a group 31 deep cycle battery. As for the cables, make sure you don't get the polarities wrong. Usually at the battery black is positive and white is negative. The positive wire should be fused. You can check with a multimeter which wire is ground by doing a continuity test to a bare mental surface.

Here's a good start: http://www.marxrv.com/12volt/12volt.htm

Congrats on the new to you trailer!
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Old 01-31-2016, 09:45 PM   #7
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Originally Posted by marcham View Post
Do you have a gas furnace? Will you ever camp without power? If the answer is no then get a deep cycle or marine hybrid group 24. If you have a gas furnace and/or might camp a few nights without hookups then get the largest battery that will fit in the tray, that will probably be a group 31 deep cycle battery. As for the cables, make sure you don't get the polarities wrong. Usually at the battery black is positive and white is negative. The positive wire should be fused. You can check with a multimeter which wire is ground by doing a continuity test to a bare mental surface.

Here's a good start: The 12volt Side of Life (Part 1)

Congrats on the new to you trailer!
Oh.. I get it.. the green connector is where a fuse goes??? thanks for pointing that out.
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Old 01-31-2016, 09:54 PM   #8
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Originally Posted by BFlinn181 View Post
I'd buy as large a deep cycle battery I could. Your refrigerator and furnace are probably the main battery draws. If you replace the interior incandescent light bulbs with LEDs, they won't draw much power. How are you going to charge the battery? Do you have a converter/charger or just a hook up to the tow vehicle alternator? Is your trailer equipped with electric brakes? Is this battery also going to be powering the break-away function of the brakes?
The trailer does have converter/charger, but does not have any electric brakes. at least I don't think it has electric brakes. I guess I need to check this out. I'm a total newbie here.
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Old 02-03-2016, 03:09 PM   #9
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Hard to tell from the pictures but you need to make sure you know which cable is positive and which is negative. Where does the other end of each cable connect?
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Old 02-03-2016, 03:41 PM   #10
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You can probably get by with a Gr 24 but for a few bucks more, a Gr 27 might give you a couple more hours of light if you are in a CG and the power goes out.
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