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Old 09-21-2015, 09:15 PM   #21
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Batteries

I have 600 watts of solar into a 60 amp controller feeding 4 x 190 amp hr Interstate Group 31 batteries. IMO, six volt batteries take up twice the space as a 12 volt and they weigh FAR more. I have the multi 6 volt arrangement in my boat and would change to 12 vdc units in a sec if I could, but stuck with the current arrangement.
If you have the room, I would go with the group 31 batteries, just make sure they are true deep cycle units. There is no substitute for amp hrs. Sooner or later, you will need them if you plan on boondocking.
If you search the threads, you will find hundreds of problems with people running out of 12 vdc at the worst times.
Remember that a 6 vdc bat at 200 amp hr rating is 200 amp hrs AT 6 VOLTS, NOT 12 volts. If you combine two 6 volt batteries of 200 amp hrs each, you will have 200 amp hrs at 12 vdc, NOT 400 amp hrs.
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Old 09-21-2015, 09:57 PM   #22
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Originally Posted by brooklyncowgirl View Post
Thanks guys. I Appreciate the input. Looks like size wise We're limited to 2 6 volt, 2 group 24 12 volt or one bigger 12 volt. That and the fact that we are cash strapped newbies and therefore need moron proof DIY. 6 volt sounds good and I've seen the wiring diagrams it doesn't look too complicated but what happens if we screw it up?
The best bang for your buck is (2) 6 volt deep cycle in series. The less expensive ones on average have about a 200 amp hour rating and sell for about $100 each. So you can have a 200 amp hour battery bank (100 ah usable) for about $200.
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Old 09-21-2015, 10:04 PM   #23
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When going to the 6volt route...

At what point do you have to upgrade the converter / charger?

4x6v?


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Old 09-21-2015, 10:30 PM   #24
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FYI, 2 x 6vdc batteries weigh about 110 lbs as opposed to a 70 lb for one 200 amp hr battery and the two 6 vdc batts take up almost twice the room. Also, when you replace the 6 vdc batts, assuming you will one day, you will need to replace both at the same time as adding a new unit to an old unit [series] will just drag down the new batt and will not allow you to charge to maximum.
My Interstate Group 31s have a three year replacement guarantee. I don't know of any 6 volt batts that will offer that and believe me, I have 8 in my boat, but have replaced the 6 vdc units in my golf cart with 12 vdc. I saved over 100 lbs by converting the cart.
This arrangement works for me and I realize it isn't for everyone, but the more you know, the better choice you can make.
I forgot to mention twice the core charges for two batts rather than one. About $25 more.
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Old 09-21-2015, 10:32 PM   #25
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The concensus is the charger output should be about 10% of the 20hr ah rating of the battery(s). So, at 400ah (4x6v) a good charge rate would be 40 amps.
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Old 09-21-2015, 10:36 PM   #26
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Originally Posted by Kenny kustom View Post
When going to the 6volt route...

At what point do you have to upgrade the converter / charger?

4x6v?


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You shouldn't HAVE to upgrade your converter unless you just want to add more charging amps. If you have a WFCO converter, you may want to give thought to a Progressive converter around 60 amps. I've had two WFCO 55 amp units go south on me in three years. Progressive is a much better unit and they go up to 90 amps.
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Old 09-21-2015, 10:53 PM   #27
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I could be wrong, but I have never heard of a Group 31 battery having a 200 ah rating, usually they are around 100-120 ah.
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Old 09-21-2015, 11:18 PM   #28
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I could be wrong, but I have never heard of a Group 31 battery having a 200 ah rating, usually they are around 100-120 ah.
You could be wrong, but you aren't. It's impossible to get 200ah out of a Group 31 form factor.
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Old 09-22-2015, 12:36 AM   #29
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You could be wrong, but you aren't. It's impossible to get 200ah out of a Group 31 form factor.
Good chance he meant 200 from the pair, vs 220 or so from 2 6s. The good news is 6s are the same footprint as gr 24s

Whereas 2 27 s or 31s do not fit my rails.

I agree match the pairs, don't worry about a 6 dieing dead. If one of your 12s dies dead it will kill the other before you figure it out anyway. We like the solar on the roof, but try a single 100 on the ground then mount it later if it feels like ground handling it is a drag. I wanted it on the roof and done. Cheapest deal I found was windynation.com

There are 11 of those in my camping group and no one is unhappy. Even if you only buy 100 watts I suggest the 30 amp charger which will handle expansion.
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Old 09-22-2015, 12:40 AM   #30
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We own a Tracer Air 252 trailer. The trailer came equipped with an Exide group 24 dual purpose marine battery. We've found that even without using lights (we're planning to upgrade to LED) that we had to run the generator every day when camping without shore power.

Since our plans are to do a lot of boondocking and camping in national parks and forests, etc. we want to upgrade our battery capacity and add a portable solar panel and use the generator for backup when solar fails.

The battery bracket is on the tongue behind the gas canisters. It consists of two pieces of L iron, the shorter of which is 26" set 9" apart welded onto the tongue from underneath (I'm a bit concerned about the strength)

The cheapest option would be to add another group 24 battery. I'd like to go with a true deep cycle battery instead of a dual purpose. Can I mix the two or would I have to buy two deep cycle batteries?

I'm also looking at the possibility of going with two 6 volt golf cart batteries. These should fit in the space we have and give us more power. Batteries Plus near me sells Duracell 6 volt batteries at a pretty good price. This would be more expensive but give us more battery for the buck.

At any rate, any advice would be greatly appreciated.
Box(es) for 2 T105s

The above post is about upgrading to 6 volt battery's and how to mount them to the trailer.

Hope this helps Tim
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