Big Battery Combiner Box - Off the Shelf or DIY?

[jnmit12]

Reviewing many existing threads, I'm left with a basic decision for my large off-grid design:

A) 2 X MidNite 1000amp battery combiner boxes

B) DIY Busbar / combiner enclosure with MNEDC250 remote trip breakers

The potential benefit of option B would be expandability and influence over layout/form factor.

I have (4) Sol Ark 15ks and (16) 48v LiFePO4 batteries in an off-grid environment. OCP for 16 seperate batteries while maintaining consistent cable length is a challenge and I can envision a solution with ~3ft linear busbars and breakers aligned with each terminal in close proximity. A single Midnite box doesn't have sufficient breaker knockouts to handle the number of batteries I am using, so by the time I combine 2, I have spent $$$ and consumed a lot of wall space.

Any thoughts on these options or alternatives? Any easy mounting solutions for the breakers?

 

[JBoffgrid2022]

It would largely depend on if you were attempting to get any of this setup approved by local or state code. If this wasn't an issue, you'd be able to build whatever "Frankein-Box" your heart desires!

 

[Brucey]

Just be aware the remote trip mnedcs aren't ul listed like their non shunt cousins, if that matters to you.

 

[jnmit12]

Just be aware the remote trip mnedcs aren't ul listed like their non shunt cousins, if that matters to you.

Thank you. I'm not concerned with UL etc (truly off-grid), but trying to add as much logical safety features as possible. (I have remote shunt on the AC side and planning for the same on the DC side.
Currently looking to build the battery combiner box, as 16 x 250a MNEDC breakers take up too much space for off-the-shelf-solutions!

 

[740GLE]

Could you combine say group of 4 batteries to a bus bar, then only need 4 250a MNEDC to the 4 bus bars?

 

[kennyb]

Would a few of these work?

Battery Combiner Box 4 in 1 out 150A per input, 600A total, UL Listed – Made in the USA – Watts247 Affordable DIY Solar Power

watts247.com

 

[jnmit12]

Would a few of these work?

Battery Combiner Box 4 in 1 out 150A per input, 600A total, UL Listed – Made in the USA – Watts247 Affordable DIY Solar Power

watts247.com

Thank you. I had not seen these, but each BMS is rated for 200a (and the combined charge/discharge capacity of my inverters would preclude a daisy-chain solution - at least in my understanding)