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

Fri Dec 19 14:49:24 PST 2025

I do think the Electrician tried to balance the loads in the three 240 V
panels, but how close he really came especially with add-ons down the road
I don’t know. It does work fine, and the system is 5+ years old now without
any issues.

*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 5:46 PM david quattro <david at quattrosolar.com>
wrote:

> 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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>>>>
>>>> --
>>>>
>>>> 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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