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

[Kirk Herander]

Hi,
I’ve done one large off grid system with 480 -3 - phase inverters and 1
mwh, 850 vdc LFP storage.

We created 240vac  by stepping each 480v L-L phase down to 240 through its
own transformer of proper size.
So we have three 240/120 VAC panels for typical household loads.


*Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*

*Owner|Principal, VT Solar, LLC*

*Celebrating our 34st Anniversary 1991-2025!!*

dba Vermont Solar Engineering

802.559.1225


On Fri, Dec 19, 2025 at 5:25 PM david quattro via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I’ve thought about HV and 60K model, but my loads are 240 Single phase,
> across 5 separate contiguous parcels.  all these homes already have their
> own utility meters.  There is one owner.  The plan is to have an ATS at
> each meter.
>    Regarding 3 phase offgrid, I’ve been concerned about phase imbalance.
> Maybe I don’t need to worry about that.
>
>
>
> On Fri, Dec 19, 2025 at 1:51 PM Michael Morningstar via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> A couple or three Discover HVs and Sol-Ark 60ks. Done quickly
>>
>> On Fri, Dec 19, 2025 at 1:00 PM Kirk Herander via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> Why 48v, why not commercial DC, like 850? What are you looking at for
>>> kwh storage? A1000vdc buss, homemade or otherwise, would drop the buss
>>> rating down to about 300 A. Commercial grade  inverters, such as 3-phase
>>> Delta PCS inverters are spec'ed for these situations.
>>>
>>> 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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>>>
>>> --
>>>
>>>
>>> *Kirk Herander / **kirkh at vermont.solar <kirkh at vermont.solar>*
>>>
>>> *Owner|Principal, VT Solar, LLC*
>>>
>>> *Celebrating our 34st Anniversary 1991-2025!!*
>>>
>>> dba Vermont Solar Engineering
>>>
>>> 802.559.1225
>>> _______________________________________________
>>> List sponsored by Redwood Alliance
>>>
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>>
>> --
>>
>> Michael Morningstar
>>
>>
>> Morningstar Electric Inc
>>
>> PO Box 1494
>>
>> Mount Shasta, CA 96067
>>
>> 530-921-0560
>>
>> CSLB 1116835
>>
>> mjmorningstar at gmail.com
>>
>>
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