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Old 07-09-2014, 06:54 PM   #1
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Auxiliary battery

80% of the time we use our AS, it's plugged into 30amp. We have 1 battery and it's no problem. 20% of the time we boondock and need more battery power.

I'd like to add a battery to the camper only on boondocking trips. There's room for an additional battery behind the propane tanks.

Can I simply add a 7 pin female receptor to the extra battery's box? When I arrive at destination, unplug the pigtail from the truck and plug it into the battery box?

Should there be an inline fuse or isolater in the battery box? The 2 batteries will be very similar and I plan to rotate.

Thanks...


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Old 07-09-2014, 08:13 PM   #2
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It may not be the ideal way to do it, but since you use it that way only once in a while, probably will work out for you. Yes, put a fuse in the + line in the new battery box, but no isolator.

I assume you would recharge the second battery when you get home, with a battery charger of some type.
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Old 07-09-2014, 08:53 PM   #3
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I installed a 7 pin receptacle near the existing battery and wired it to that battery. When boon docking I simply set the extra battery outside the trailer and plug it in.
Of course there is an inline fuse.
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Old 07-09-2014, 09:21 PM   #4
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Why not just mount the auxiliary battery beside original and put two battery cables with a selector switch or two isolation switches and then you could run on one or two batteries or one or the other.they sell the isolation switches (rotary knob ) at princess auto Canada or harbour freight tools u.s.a,
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Old 07-09-2014, 11:47 PM   #5
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Caveat: Problems arise if the batts are not the same manuf / date, group size, and age ... if you charge them together from a single source.
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Old 07-10-2014, 01:43 AM   #6
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When boon docking. I charge the batteries separately with the solar panel. Not a big deal to me if they discharge at a slightly different rate.
I use the Wal-mart RV batteries. Get 4 to 5 years out of them.
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Old 07-10-2014, 05:10 AM   #7
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Caveat: Problems arise if the batts are not the same manuf / date, group size, and age ... if you charge them together from a single source.
You can use two different size batteries if there is a isolation switch that way you can still use trailers charger ,converter ,inverter ,solar panels.the key is one or the other battery , but not both if they are different manufacture,age,or amp hour rating.
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Old 07-10-2014, 08:35 AM   #8
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You probably have a GR24 battery. All you need to do is get a GR29 and a bigger battery box and you'll be fine.
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Old 07-10-2014, 08:55 AM   #9
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Group 29 batteries are HEAVY!
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Old 07-10-2014, 05:48 PM   #10
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I have a charger for the extra battery, but why? If the convertor is plugged in while being stored and the extra battery via the pigtail, why not let it charge both? Thanks for all the input. I'll add a few photos of the finished project in a week or two and keep you posted.


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Old 07-10-2014, 05:51 PM   #11
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I'm going with 2 deep cell group 29,s at 125 ah each. Walmart has them for $100 each. I'd rather screw up $200 in batteries than $800 in Lifelines.


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Old 09-23-2014, 05:35 PM   #12
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I built the extra portable battery box. I plug it in to pig tail when needed. It works great. So far, no problems.


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Old 09-23-2014, 10:31 PM   #13
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I installed a 7 pin receptacle on the side of the coach near the house battery. I plug my portable battery in at this point as well as my portable solar panel. Works great.


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