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Overkill BMS for 200a?

tonyg

tonyg

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Apr 5, 2022
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I don't think I noted any BMS from overkill to offer over 100 amps.

Can you somehow have two connected? I doubt it but it's worth asking...

Here in the UK, Daly can be found for sale, but as @OffGridGuy mentioned on another post, the larger BMSes from Daly are not something to be proud off. Also, JKBMS and JBD are not to be found in the UK... So I'm quite stuck for choice, unless any of you would know of a good BMS hidden in the corners of eBay.co.uk

I think solar DIY is still in its embrio phase here.
 
I would go ahead and build a second battery to avoid discharging the cells at 200 amps. Many cells seem to say ½C as recommended maximum sustained discharge rate.
 
The Eve LiFePo4 cells allow up to 280A discharge, so I thought pulling 200A would be fine if needed.

Building a second battery is out of finances at the moment. A 48v 16 cell eve battery costs about £2.5k at the moment, which is pretty hefty. But that is about 12kwh of energy storage, so worth it.
 
Would it be a better idea to split the cells into 4x4, that's 4 smaller batteries of 12v, totalling 48v? Then have four BMSes 4s 12v of 200A or 250A each.
 
tonyg said:
Would it be a better idea to split the cells into 4x4, that's 4 smaller batteries of 12v, totalling 48v? Then have four BMSes 4s 12v of 200A or 250A each.
Click to expand...
No
Batteries in series, won't stay balanced with each other.
Extra maintenance will be required.
And, you will still have the same output.
To get 48v, 16 cells have to be in series. One BMS keeps them all balanced.
 
Put two cells in parallel then take 16 of these two cell groups and hook it up to your BMS or if you need to charge/ discharge at 200 amp build two 16s batteries with two BMS
 
I bought a JDB (same as overkill) 300A contactor based BMS for that reason. I don't intend to pull 200A from the cells at any point, but I'm building for worst case scenario (IF one pack went down and IF I had a heavy load going).
 
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