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Old 05-07-2014, 09:45 PM   #1
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Adding an extra house battery

I have a 2011 Jayco 31SS and because we always camp with no hookups I was thinking about adding another battery. There is no room where the current battery is located (that slide out drawer deal). I'm looking for some easy ideas.
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Old 05-07-2014, 11:22 PM   #2
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Originally Posted by bmurph44 View Post
I have a 2011 Jayco 31SS and because we always camp with no hookups I was thinking about adding another battery. There is no room where the current battery is located (that slide out drawer deal). I'm looking for some easy ideas.
I had the same issue. I installed a VMChargetank group 31 AGM battery under the bed. http://www.amazon.com/Vmaxtanks-Batt.../dp/B0042L7DZ8 I also swapped out the existing flooded house battery with the same battery. It fits in the factory slide out tray. I connected the new battery to the inverter negative post and to the factory input 12v power post. Oh yes I also have a separate fuse and battery disconnect. With this setup you need to turn off the 2nd disconnect prior to turning off the factory disconnect.
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Old 05-08-2014, 08:27 PM   #3
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I was thinking the compartment right next to the house battery tray but I thought you was never suppose to install a battery in a closed space.
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Old 05-08-2014, 08:31 PM   #4
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Correct. The battery will need a battery box with external vent
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Old 05-08-2014, 09:37 PM   #5
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can you not tie two together.. Keep it 12 volt not 24 volt .. Or is that to much to charge two batterys at the same time . ?????
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Old 05-08-2014, 10:22 PM   #6
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They should go in parrellel and remain a 12 volt supply, just 2x the Amp hours.

Keep the connections as short as possible and as large a gauge wire possible.

NormAlly, you would establish 2 batteries at the same time, and matching in make and size.

They need to be the same AH size, unless you intend to operate and charge each battery independently , or the stronger of the two will be become parasitic to the smaller.
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Old 05-09-2014, 04:58 AM   #7
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That's great advice with emphasis on the parallel terminations. Otherwise you could do damage to your electriacal system if the fuse doesn't work.
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Old 05-10-2014, 09:33 AM   #8
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Originally Posted by bmurph44 View Post
I was thinking the compartment right next to the house battery tray but I thought you was never suppose to install a battery in a closed space.
You would need to install with a vent if it is a standard battery however if it is an AGM battery then it is not necessary. You can even install AGM batteries inside a passenger compartment. The compartment next to the battery tray could work however you would need to have a hold down and or battery tray because you want to ensure the battery does not move around.
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Old 06-12-2015, 09:42 AM   #9
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Parallel configuration

The original poster is correct, don't wire up (2) 12V batteries in series. However...

Batteries should not be wired in parallel because they will charge/discharge each other, which ultimately just consumes energy in both batteries. In addition, when one of the batteries fails (as they all do eventually) being wired in parallel will cause the other battery to fail.

If you want to increase capacity, place (2) 6V batteries in series. In order to end up with more total energy, the AH rating on the two 6V batts will need to total more than the AH rating on the single 12V.

I've been searching for the perfect physical size batteries to achieve this for my 31SS but have not yet found them. I"m probably going to put in the best Group 31 battery I can find or try to shoe-horn a Trojan T-1275 in the stock battery housing by removing the sliding tray.
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Old 06-12-2015, 10:07 AM   #10
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The original poster is correct, don't wire up (2) 12V batteries in series. However...
snip...
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