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Old 12-23-2015, 06:07 PM   #1
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combining battery groups a no no?

My 93 Excella has 2 group 27 batteries in enclosed battery cases. How would adding a second pair of group 24s or for that matter group 31s work out?
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Old 12-23-2015, 06:16 PM   #2
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It all depends on how they are electrically connected. It can be done, but needs to be done correctly. If you're putting them all in parallel, they should all be of the same size and age. If there will be two sets that you switch between, they could be of differing sizes between the two sets, put each pair should be of similar age and size.

Personally, I wouldn't do it. I'd think about four 6VDC deep cycle batteries in series parallel if you're just looking for lots of capacity. Or, be able to easily recharge the pair of batteries you currently have.
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Old 12-23-2015, 06:16 PM   #3
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I'm no expert but everything I've read/heard indicates this is a bad idea. Apparently the batteries, no matter what type (flooded, AGM, maybe even Li) need to be installed at the same time, must be the same type/rating, etc.

So, if you believe the experts your idea won't work. It may work for some period of time but it will likely cause problems at some point.

It makes sense to have all the batteries the same. If any one of the batteries is weaker than the others or has some other variation it's not difficult to imagine the system develops a "weak link" and will not work properly.

I am considering a battery upgrade and will likely add up to four new AGM's that can be put inside the trailer under the front couch.
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Old 12-23-2015, 06:20 PM   #4
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It all depends on how they are electrically connected. It can be done, but needs to be done correctly.

I'm not sure what this means??

If the old batteries are "bank 1" and the new batteries are "bank 2" and they are wired separately, charged separately, discharged separately I guess it could work. If that's the case that sounds like too much work and will not really provide an upgraded battery system in my mind.
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Old 12-23-2015, 06:41 PM   #5
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I'm not sure what this means??

If the old batteries are "bank 1" and the new batteries are "bank 2" and they are wired separately, charged separately, discharged separately I guess it could work. If that's the case that sounds like too much work and will not really provide an upgraded battery system in my mind.
That is one way of doing it. Two separate parallel pairs.

Another way would be four, all in parallel.

As I mentioned, it isn't something I would do. I can be done, but why?
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Old 12-23-2015, 06:45 PM   #6
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Assuming that you want all the batteries in the same bank (i.e., and not in two separate banks - and why would you do this anyway??) they should be of the same brand, size, type (e.g., wet cell, AGM or LiFePo) and vintage.
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Old 12-23-2015, 07:02 PM   #7
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I do it all the time and the world hasn't come to an end yet.
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Old 12-23-2015, 08:48 PM   #8
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Do you want to do it half assed, or do you want to do it the correct way? That's the question here.
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Old 12-24-2015, 12:10 AM   #9
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Do you want to do it half assed, or do you want to do it the correct way? That's the question here.
Just want an answer to my question
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Old 12-24-2015, 01:00 AM   #10
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Sure, you totally can

Let’s see what our battery guru, Justin at LifeLine Battery says:

Quote:
“It has previously been said that this is not a good idea; however, we have done some pretty extensive lab testing and we can find no differences in the batteries. Age is important but size is not. You can safely mix and match battery sizes in one bank.
Also, Sabre Yachts does this from the factory. This was one of the reasons we started testing this scenario. Sabre use a GPL-4DL and when they want to upgrade a battery bank they add a GPL-31T.”
Source
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Old 12-24-2015, 07:40 AM   #11
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Originally Posted by BoldAdventure View Post
Sure, you totally can

Let’s see what our battery guru, Justin at LifeLine Battery says:

“It has previously been said that this is not a good idea; however, we have done some pretty extensive lab testing and we can find no differences in the batteries. Age is important but size is not. You can safely mix and match battery sizes in one bank.
Also, Sabre Yachts does this from the factory. This was one of the reasons we started testing this scenario. Sabre use a GPL-4DL and when they want to upgrade a battery bank they add a GPL-31T.”

Source
That's useful information and substantiates another post above.

However, I think there may still be caveats to this scenario. For instance, I suspect it's not good to mix battery types such as AGM and flooded.

As Justin says, mixing new batteries and old batteries, regardless of type, is not a good combination. That may be part of what the OP is asking.
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Old 12-24-2015, 07:51 AM   #12
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If affordable uniformity is the top shelf solution and best investment for the long haul IMO. Pay upfront now to minimize unexpected costs later.

Simple
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Old 12-24-2015, 08:03 AM   #13
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My half assed solution is 2 group 24 hooked to 1 gr. 27 hooked to 1 gr 30. Lots of power and in 17 years only 3 batteries replaced.
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Old 12-24-2015, 09:13 AM   #14
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Quote:
Originally Posted by nvestysly View Post
As Justin says, mixing new batteries and old batteries, regardless of type, is not a good combination. That may be part of what the OP is asking.
My mix and match question is based on my layout. My classic has 2 battery compartments each of which will fit one series 27 battery in the front of the trailer. I am changing out the front couch which gives me access to this area. I may be able to fit 2 additional series 24 batteries in the front of the trailer but probably not series 27. There is also a metal box in the A frame which may hold a battery or 2. . If I add batteries under the couch I will need to use AGMs or make additional vented battery boxes. I could also lay AGMs on their side.Not adding batteries now, but maybe down the road
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