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Old 01-25-2019, 06:01 AM   #1
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6V vs 12V

The "maintenance free" 12v batteries (4) that came with my coach aren't holding a charge. I need to change them. Is it better to change to 6 volt batteries? Is if difficult to "rewire" them system?

From reading the forums, I understand the LifeLine batteries are highly regarded, but they are out of my price range. Any thoughts about Trojan batteries or other alternatives? The original coach build sheet called for AGM batteries, somewhere along the line someone cost cut and installed 12 volt dual purpose deep cycle marine batteries.

Going full time by June 1 and have to upgrade what we can now vs on the road.

Any recommendations will be appreciated.

Thanks
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Old 01-25-2019, 06:14 AM   #2
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I found the 6 volt golf cart batteries from Costco to be a better value than remaining with 12 v deep cycle. You will have to rewire your batteries but it's not expensive. There are some good posts on this subject, here's one:
http://www.irv2.com/forums/f84/chang...ts-368503.html
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Old 01-25-2019, 10:10 AM   #3
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I went from two 12V batteries to two 6V batteries and didn't have to rewire anything. It was just a different way to wire the 2-6V batteries to provide 12V. No problem.

The 12volt Side of Life (Part 1)
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Old 01-25-2019, 11:19 AM   #4
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If you have 4 batteries, you should have enough jumper cables to go with 4, 6 volt batteries.

Here is a shot of how parallel batteries are wired ( ignore the type of battery used in the picture )

The second shot is how 4, 6 volt batteries would be wired for a 12 volt system.Click image for larger version

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Old 01-29-2019, 02:24 PM   #5
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For a limited budget, are Trojan T-105 flooded batteries OK? Significant price difference for AGMs.

Just wondering.....
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Old 01-29-2019, 03:15 PM   #6
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I used a pair of Trojan T-105 batteries for about 10 years before selling the trailer to the neighbor. The batteries were kept watered and hooked to 240 watts of solar so they were charged to 100% everyday. The usage wasn't heavy but I did use a 1000 watt inverter for running a vacuum and blender and a few smaller items in addition to the 12 volt loads of fan, furnace, lights, cell phone charging, etc...

I never deep discharged them beyond about 50% which helped the long life.
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Old 01-29-2019, 03:36 PM   #7
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I agree. Trojan T-105 6v golf cart batteries lasted us almost 10 years in our Windsor. They will outlast anything else out there. I found a good buy on eBay and was able to pick up at our local golf cart shop.
You will need an extra jumper wire to go between each pair of 6 volt batteries to make them into a 12 volt system. I purchased the extra battery cables on Amazon with 3/8 lugs on each end.

These batteries will require regular cleaning and watering. You can purchase a water manifold kit that makes it easier. (I still just use a battery water filler bottle.)
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Old 01-31-2019, 08:52 AM   #8
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What about 4D size batteries? Can 2 of those be used instead of 4 6v or 12v batteries. Price seems comparable, weight is about the same and less wiring.

Just wondering.
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Old 01-31-2019, 09:37 AM   #9
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I would have to ask exactly which 4D batteries you're referring to. Many 4Ds are in fact the same thing you're replacing: "marine deep cycle" or basically a starting battery. True deep cycle batteries have different plate design.

When I replaced my house batteries a few years back I had many of the same concerns and constraints. I wanted good quality batteries, good value, high capacity but on a budget. Of course I wanted lithium but couldn't afford the $5k+ price tag. Couldn't even really afford the $1500 or so AGMs would cost.

If you're willing and able to put the effort into monitoring the condition and taking care of good old flooded acid (FLA) batteries they are very reliable and can last a long time, just understand their limitations.

There are a number of good quality FLA batteries out there, including the Costco ones mentioned. I would respectfully submit that you won't find better overall value than something like the venerable Trojan T105.

Consider this - if you're going to have FLA batteries you need to be able to access them for maintenance. Work backward from your existing battery compartment. How much room do you have? Are the batteries already mounted on a slide? If not is there room to get your head in there to check the cell water level?

I had a very limited amount of space to work with and ended up repurposing a different compartment to allow me to dedicate more space to house batteries and install a slide. I chose the battery configuration that gave me the highest amperage capacity that would fit in the footprint available which in my case was 4 Trojan T145s. T-145s have exactly the same footprint as a T105, just a little taller. That gave me a total of 520 amps (260 available) which has worked out great. I boondock a lot...mostly in fact.

A couple other things: 1.get a good battery monitor like a Trimetric or Victron, and 2. take a look at your battery charger. If it's an older 'dumb' converter charger consider replacing it with one that has more sophisticated multi-stage charging capabilities - you're batteries will last much longer.
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Old 01-31-2019, 11:00 AM   #10
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Quote:
Originally Posted by Wanderer23 View Post
What about 4D size batteries? Can 2 of those be used instead of 4 6v or 12v batteries. Price seems comparable, weight is about the same and less wiring.

Just wondering.
Wiring 4, 6 volt batteries, involves 2 added jumpers, one between each pair of batteries. Everything else stays the same.
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Old 01-31-2019, 11:14 AM   #11
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Thanks. I have easy access to my 4 house batteries. Currently they are 12v Group 31 maintenance free. I just am struggling which way to go to replace them. They were new in 2018 and just don't hold a charge. I have good battery shut off switches on house and chassis batteries, but within a couple of days these things go way down. I've made certain all switches, etc are turned off in the coach and checked for any vampire drains on the system. Can't find any amp draw at all. So I figure its the batteries, although they individually all check OK voltage wise initially. I thought one of them may have a dead or weak cell......doesn't show up. I'm running ZERO devices in the coach. Its in its enclosure, but w/o any external electrical hookups.


I was considering Trojan T1260 or 1275, 12v replacements just to not have to get new cables.


I need to check if I have room for 6 T105 batteries. I can get them for $870 locally

Just don't know which way to go.

Coach is currently out getting 300 watts of solar panels installed to hopefully keep just the batteries charged.
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Old 07-13-2019, 01:47 PM   #12
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12 volt plus two six volt batteries

Can two six volt batteries connected in series be connected in parallel to a 12 volt battery for my Class C rv? Or is this a bad idea? I have 180 watts roof mounted solar panels and A 200 watt portable panel.
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Old 07-13-2019, 04:09 PM   #13
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Quote:
Originally Posted by Txag85 View Post
Can two six volt batteries connected in series be connected in parallel to a 12 volt battery for my Class C rv? Or is this a bad idea? I have 180 watts roof mounted solar panels and A 200 watt portable panel.

Google is your friend... Look at the different combo's of battery numbers, and 6V vs 12V, writing options!

Best to you,
Smitty

https://www.google.com/search?q=6v+b...pAJ1tcrFsbzqM:
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Old 07-13-2019, 04:46 PM   #14
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I connected 2- 6 volt GC2 batteries in series, to my GP31, 12 volt house battery on my old class C.

Ran it that way for 5 years and all three batteries survived.

I traded it in last fall and pulled the 6 volt ones out to use in the new MH. They didn't fit so they are in my shed waiting for a purpose. Still held a charge all winter long.
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