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Old 30-03-2016, 14:32   #31
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Re: House bank upgrade verification

Your proposal is the standard way it is done.

2, 6 volt batteries in SERIES makes a 12 volt pair.

3 series pairs, in PARALLEL make a 12 volt bank.

I do it with 4 pairs. Each positive cable goes to a post on 2, A-B switchs. The common post of the 2, A-B switchs goes to a 250 amp fuse.

Negative cables are combined into two and placed on the battery monitor shunt.

I can isolate any set for testing or all for storage.

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Old 31-03-2016, 02:35   #32
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Re: House bank upgrade verification

Originally Posted by SailtheWind View Post
Actually I am proposing to create three, 2 battery, 12volt 240AH battery packs and connecting them in series for a 12volt 720 AH house bank. I was just asking if I built what the drawing (post#1) shows will I achieve my goal?
Hi SailtheWind, I think you got your answer, everyone here confirms you diagram is correct and gives you 720 Ah @ 12 V. And it's obviously how most people would proceed. Not me though

So, I don't mean to hijack your thread but I would be happy to hear other opinions on 2S3P vs 3P2S configuration ... anyone ?

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Old 31-03-2016, 04:26   #33
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Re: House bank upgrade verification

Originally Posted by sailcrazy View Post
I wired our boat battery bank a little differently, in a system that gives me more control, for safety if you get a dead/run-away battery; I can easily isolate any one or two of the 12v "batteries". I used 3 sets of 2 Trojan T105s, connected the (+) of one to the (-) of the next to make a 12v "battery, then connected the (+) each 12v "battery" to a on/off switch and then to a common bus bar. Then I connected that bus bar to another On/Off switch, then to the house fuse, and to the house load. If any single 6v (or the 12v "battery") develops a problem, a simple turn of that switch eliminates it from the bus bar (and the system)....but the house remains powered. And as long as all 6 are working correctly, I enjoy the higher amphr capacity of the entire bank. It's worked flawlessly now for 13 years. PS...I also monitor each battery via a pair of Xantrex Link 20 battery monitors....position #4 is for the isolated separate start battery.

Best setup of the thread!

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