Need to Parallel 10 Deep Cycle Batteries

I've seen examples of how to appropriately wire 4 to charge and discharge evenly but for some reason 10 batteries breaks my head lol. Can someone please assist.

The first battery on negative is the last battery on positive. Basically, battery 1-10 on one side, and 10-1 on the other.

DIYrich said:

The first battery on negative is the last battery on positive. Basically, battery 1-10 on one side, and 10-1 on the other.

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That's how I originally had thought but what threw me off was a more recent article at windynation about how that is still not truly balanced usage of the batteries. There section labeled "Perfectly Balanced Charging" made me think there might a better way.

The best you can do with 10 batteries is two groups of 5.

Bus bars, BIG bus bars.

Rednecktek said:

Bus bars, BIG bus bars.

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So I was reading that aluminum can be used as bus bars. And I just so happened to have 2 that are 1/4" (6mm) x 1 1/4" (31mm) that are long enough for all batteries. Don't know if they would work but if so all I would have to do is drill holes for the threads of each battery to pass through and I would be ready to go!

I've always used this site for lead-acid stuff (OP didn't mention chemistry?):

batteryuniversity.com/articles

They always seemed to have the right stuff for sorting out these kinds of battery hookups. About a billion articles, so some digging is needed.

If you can't find a close parallel (pun intended) to how you want to hook your batteries up, while still managing to get them all equally charged, consider writing to them, and maybe their "engineers" will respond with advice, and ultimately, another article!

Note: if these are LFP batteries, then bms may become a limiting factor, and manufacturer should be consulted for approval of final series or parallel wiring (as in, how many will they let you do in either separate or combined topology).

myersfamilyhome said:

So I was reading that aluminum can be used as bus bars. And I just so happened to have 2 that are 1/4" (6mm) x 1 1/4" (31mm) that are long enough for all batteries. Don't know if they would work but if so all I would have to do is drill holes for the threads of each battery to pass through and I would be ready to go!

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I'm using 56' of 1x.25 bar as bus bars for my NMC battery. Hope it's good enough.

Your .25" x 1.25" has the approximate equivalent electrical conductivity of 4/0 copper (about 20% better), so if you're going to pull big loads, it may not be sufficient.

Does it suck? No.

sunshine_eggo said:

I'm using 56' of 1x.25 bar as bus bars for my NMC battery. Hope it's good enough.

Your .25" x 1.25" has the approximate equivalent electrical conductivity of 4/0 copper (about 20% better), so if you're going to pull big loads, it may not be sufficient.

Does it suck? No.

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What kind of loads have you pulled on yours and for how long if you don't mind me asking

myersfamilyhome said:

What kind of loads have you pulled on yours and for how long if you don't mind me asking

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It's a 48V system, so I rarely pull more than 100A.

It's better than 4/0 copper, so if you got it, I'd use it.

Side note: Aluminum has a passive corrosion layer that impedes conductivity. Prior to installation, you could buff the contact faces to remove this layer and apply a conductive corrosion inhibitor for use with Aluminum. I used NO-OX-ID A-special Electrical Contact Grease. DO NOT use dielectric grease. Dielectric grease should NEVER be in the current path.