Paralleling marine type battery with a pair of 6V GC batteries - Dutchmen Owners

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Old 01-11-2016, 08:53 PM   #1
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Paralleling marine type battery with a pair of 6V GC batteries

I'm planning on adding a second battery in the spring.
I bought a selector switch, so that I could charge one low battery at a time while minimizing the load on the charging device. ie: car or converter or isolate the batteries when servicing the elec. system. I'm pretty much sold on using 2 six volt GC batteries.. Do you think it would be a problem paralleling the GCB's with the marine type battery that came with my TT?
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Old 01-11-2016, 09:05 PM   #2
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Quote:
Originally Posted by Firstime RVer View Post
I'm planning on adding a second battery in the spring.
I bought a selector switch, so that I could charge one low battery at a time while minimizing the load on the charging device. ie: car or converter or isolate the batteries when servicing the elec. system. I'm pretty much sold on using 2 six volt GC batteries.. Do you think it would be a problem paralleling the GCB's with the marine type battery that came with my TT?
Pat,

I think you mean series to make a 12V out of two 6V batteries you wire one battery to you negative line, the the negative from the second battery to the positive of the first battery. Last you hook you positive line to the positive on the battery number 2.

So you idea of charging one battery at a time won't work as you would be putting 12V into a 6V battery.

Series And Parallel | How To Wire What you Want Easily And Effectively

Jim
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Old 01-11-2016, 09:20 PM   #3
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Pat,

Sorry, I think I misinterpreted your post. I think you were asking about paralling a 12V with your 12V made up from the GC batteries. If this is correct, yes it could be done, but I don't think you would like the outcome.

Now If you are putting in a selector switch to isolate the two different battery combinations that wouldn't be paralleling the batteries. It will work in theory, but how well I'm not sure and how would you charge the isolated battery.
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Old 01-11-2016, 09:24 PM   #4
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Pat
You need to do what Jim said with the (2) 6v batteries & then connect the 12v that came with your TT in Parallel with the (2) 6v. Not sure you have the room on a TT to have (3) batteries.
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Old 01-11-2016, 10:44 PM   #5
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Yes it will work, but not very practical. You should go with two 12V batteries in parallel with no switch or, if room permits, 3 12V batteries in parallel. And it's important that all batteries be of the same type and age. Otherwise, the strongest battery will lose some of it's energy charging a weaker battery.

And I assume you know multiple batteries are never needed unless you are boondocking.
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Old 01-11-2016, 10:56 PM   #6
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You won't gain much with the 'marine' type battery. It has a mcca or cca rating, meaning it isn't a true deep cycle battery. If you are looking for a longer cycle time from your batteries, which the deep cycles have, the OEM battery won't do it. You can leave it out and probably be better off without it in the battery bank.
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Old 01-12-2016, 02:48 AM   #7
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Paralleling marine type battery with a pair of 6V GC batteries

Thanks Guys,
Should have been a little clearer with my question..
But I think I get the point here.. And that is, whatever I select should be similar.. Taking two 6V batteries in series for 12V, paralleled with a single 12 marine type battery is a bad idea.. because the batteries are so dissimilar..
In theory, I expected and was concerned that that was the case! I like the idea of the Deep Cycle CG batteries but didn't want to trash the marine type battery that came with my TT..

I plan to do some boondocking but will most likely spend most of my time at sites with hookups.. That being said. I guess a second marine type battery might be the best way to go..

The biggest reason for the selector switch was to be able to have a reserve battery.. I have been known to fall asleep with the tv on, only to wake up at 4:00 in the morning to shut it off.. If that happened while I was boondocking, i'd probably end up with a dead battery in the morning.
Having a fresh isolated battery to get things rolling seemed like a good idea at the time... figured that charging each battery separately wouldn't stress the system as much as charging two low
batteries at the same time...

Haven''t been there yet, haven't done it yet, just trying to plan to avoid major problems, without "breaking the bank"..
Just hope I don't try your patience with "dumb" questions too much..

Book learning is good but experience is better..

Thanks and All the best.
Pat
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Old 01-12-2016, 04:07 AM   #8
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Quote:
Originally Posted by sundancer 87 View Post
You won't gain much with the 'marine' type battery. It has a mcca or cca rating, meaning it isn't a true deep cycle battery. If you are looking for a longer cycle time from your batteries, which the deep cycles have, the OEM battery won't do it. You can leave it out and probably be better off without it in the battery bank.
It's almost impossible to find a true 12V deep cycle around my area. The only thing that is being sold are the hybrid "marine/deep cycle" batteries.

Can't even guess how many hybrid batteries I went through before I finally got some sense and went to the golf cart batteries.

I had a good laugh when we bought our current trailer, with two slides and they supply this piddly little single Group 24 battery. Run the tongue jack down and the slides out and how much power have you got left.
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Old 01-12-2016, 10:35 AM   #9
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Pat,
They do make televisions with a count down timer on them...

I use that one on my wife all the time. Only problem is she will wake up and turn it back on, then go back to sleep.

I don't watch much television at all, grew up without it and don't miss it if I don't have it available. I have to shake my head a bit on the extremes that people are willing to go to, just to have television when they are out camping.

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Old 01-12-2016, 10:54 AM   #10
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OK Aaron,
How about falling asleep before shutting off all the lights and running a small fan all night??

Since I do a bit of traveling with my work the sound of the TV masks the sounds of the goings on outside of my motel room, making it easier to get to sleep.. especially when there's a very active couple in an adjacent room...

I'm not so much concerned about tv, but want to avoid dead batteries!!

All the best
Pat
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