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Old 02-23-2018, 08:11 AM   #1
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Dual battery banks

So I switched out my converter/charger this week with the pd4655 from Progressive Dynamics. I have 3 new agm 100ah 12v batteries coming. Since I have to put the new bank inside the trailer I was wondering if anyone has created dual battery banks. The original wet cell batteries are still functional but definitely not at optimal output. Should I just scrap the wet cells or can I set them up as an auxiliary unit. They only example I could find was someone had created a larger bank that the had a separate inverter connected to the the actually plug third 30amp cord to.
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Old 02-23-2018, 08:15 AM   #2
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It's not a good idea to mix old and new batteries in the same array, and it's not a good idea to mix different kind of batteries (wet cell and AGM) in the same array. If you were to do this, you'd need to keep both battery banks separated electrically from each other. Not sure how you could do that and still retain practical use of both for charging and using the power?
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Old 02-23-2018, 08:19 AM   #3
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The old wet battery should not be hooked up in the circuit with the new batteries. The old battery will act as a drain on the new batteries. Either go with the three new batteries or get a fourth new one.
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Old 02-23-2018, 08:31 AM   #4
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I knew that mixing them was a bad idea but wasn't sure if I could set up as a completely different bank to use as an auxiliary when the other bank got low. That way I would always have a fully charged bank and could recharge the other one. It night be too much hassle then it's worth.
Maybe getting a fourth one is the best option and keeping two outside with 2 inside.
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Old 02-26-2018, 07:52 AM   #5
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Quote:
Originally Posted by canesx5 View Post
I knew that mixing them was a bad idea but wasn't sure if I could set up as a completely different bank to use as an auxiliary when the other bank got low. That way I would always have a fully charged bank and could recharge the other one. It night be too much hassle then it's worth.
Maybe getting a fourth one is the best option and keeping two outside with 2 inside.
I believe that in terms of day to day usage, you will appreciate a single larger battery bank (with four compatible batteries) rather than two smaller ones (with two batteries each) that you have to "switch over" somehow.
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Old 03-04-2018, 05:49 AM   #6
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So ... I bought a yeti 1000 last year. I want to tie it into my 12 volt system.

Do I tie it into the 12 volt bus bar and put in two battery shut offs? ie one between yeti and one at new wet cell for travel?
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Old 03-04-2018, 09:16 PM   #7
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you could use high AMP schotky diodes to isolate the two power sources
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Old 03-04-2018, 10:02 PM   #8
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The Yeti powerpacks aren't meant to be integrated into existing 12 V systems. Among other reasons, the Yeti's lithium battery has very different charging requirements from your lead-acid house batteries. Yeti's product description says, "DO NOT ATTEMPT TO CHARGE YOUR YETI LITHIUM FROM A 12V SOURCE. Doing so may cause damage to the unit."

As for tying the Yeti's output side to your 12 V system, that could waste its power trying to charge your house batteries.

These units are meant to be used as standalone devices, not tied into an existing electrical system. If you need more power in your rig, use the Yeti as it was intended to be used, or add more/better house batteries, but don't try to lash the two together.
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Old 03-05-2018, 05:50 PM   #9
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I donít plan to charge it other than via a shore plug.
Was thinking of an a/ b shut off switch to isolate it but run through the 12 volt side. I understand the charging and need to isolate it. Thanks for inputting
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Old 03-05-2018, 05:51 PM   #10
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Probably should have bought a battleborn but wanted the other uses for tent campers.
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Old 03-05-2018, 05:53 PM   #11
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We are still only camping about 30 days a year so want to wait for other systems to mature and come down some before full solar and inverters. Follow Lesterís advice when I do it though!
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Old 03-05-2018, 11:18 PM   #12
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Late to the race.

You can create two separate banks which charge together but discharge separately using an automatic charge relay.

Dual Battery Setup with Automatic Charge Relays

http://www.airforums.com/forums/f449/dual-battery-setup-with-automatic-charge-relays-163107.html

However as others have said, one bigger bank is easier to create, especially if you are not familiar with electrical wiring.
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Old 03-11-2018, 10:45 AM   #13
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WARNING- do not install AGM inside a trailer

these must go outside.

They will out gas, this is not sake for breathing

place them OUTSIDE

note Lion DO not have this issue, they can be inside, but not AGM
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Old 03-11-2018, 06:48 PM   #14
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AGM's might, in extreme circumstances, out gas some hydrogen ( which is not hazardous, just flammable). The quantity would be minimal and the possibility that you would have a fire is almost non-existent. They can be mounted inside the trailer and usually are.
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