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

[david quattro]

Kirk,    it sounds like phase imbalance is not a problem

On Fri, Dec 19, 2025 at 2:42 PM Kirk Herander <kirkh at vermont.solar> wrote:

> 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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>>>>
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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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