[RE-wrenches] ~5,000 amps @ 48 volts

[Jason Szumlanski]

I don't have a definitive answer for you, but I do have additional
questions! Have you looked into containerized battery solutions that may
have integral bussing? I am not familiar with this market, but it seems
like it would be the path of least resistance.

What inverters are you planning to use? With the max parallel Sol-Ark 15K
inverters (12) or FlexBOSS21 inverters (16), you would "only" reach about
3,300 - 4,000A on the DC side. You could probably get this down
programmatically without losing much functionality, if any.

This DC ampacity rating suggests a very large battery bank. Are you
subject to NFPA 855 residential limitations? I am looking for guidance on
how to comply with Chapters 4-9 for residential installations in the
easiest, unambiguous way possible. We have many clients interested in large
battery banks, but I have resisted taking these jobs because of the
seemingly onerous requirements.



Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956
Florida Certified Electrical Contractor EC13013208


On Fri, Dec 19, 2025 at 1:13 PM david quattro via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hi everyone,
>    I am still helping an uber wealthy owner determine if he really wants
> this much power. If he does, do any of you have experience sourcing a 48v
> battery-combiner on the order of 4500 to 5000 amps?
>   I also want to get clear on how to best wire from batteries to combiner,
> and from combiner to inverters. I read here on the Wrenches list about some
> electricians who strategically sized conductor AWG so that resistance
> matches, which seems straightforward once we get our components mounted and
> accurate distances can be determined. Can anyone on list provide feedback
> about that, I really appreciate it!
> Thank you
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