Interesting exercise here, 5000 amps at 48 vdc, this would be 20+ Fortress evault max 48 vdc cabinets and l dont think you can put that many on the BMS. What service does he have, a 3 phase 120/208, 277/480, a 120 208 3 phase it would be around 600 + meter main, single phase close to a 1000, amps. You may want to consider a commercial solark inverter as l recall they are high voltage DC, It would be more efficient, smaller and less copper wire even with a transformer to step it down. Get more info on this existing service, voltage, phases, gets us all out of our boxes and thinking. Fun times
On Fri, Dec 19, 2025, 2:49 PM Kirk Herander via RE-wrenches < [email protected]> wrote: > 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 / **[email protected] <[email protected]>* > > *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 <[email protected]> > wrote: > >> Kirk, it sounds like phase imbalance is not a problem >> >> On Fri, Dec 19, 2025 at 2:42 PM Kirk Herander <[email protected]> >> 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 / **[email protected] <[email protected]>* >>> >>> *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 < >>> [email protected]> 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 < >>>> [email protected]> 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 < >>>>> [email protected]> 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 < >>>>>> [email protected]> 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 >>>>>>> _______________________________________________ >>>>>>> List sponsored by Redwood Alliance >>>>>>> >>>>>>> Pay optional member dues here: http://re-wrenches.org >>>>>>> >>>>>>> List Address: [email protected] >>>>>>> >>>>>>> Change listserver email address & settings: >>>>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>>>>> >>>>>>> There are two list archives for searching. When one doesn't work, >>>>>>> try the other: >>>>>>> https://www.mail-archive.com/[email protected]/ >>>>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>>>> >>>>>>> List rules & etiquette: >>>>>>> http://www.re-wrenches.org/etiquette.htm >>>>>>> >>>>>>> Check out or update participant bios: >>>>>>> http://www.members.re-wrenches.org >>>>>>> >>>>>>> >>>>>> >>>>>> -- >>>>>> >>>>>> >>>>>> *Kirk Herander / **[email protected] <[email protected]>* >>>>>> >>>>>> *Owner|Principal, VT Solar, LLC* >>>>>> >>>>>> *Celebrating our 34st Anniversary 1991-2025!!* >>>>>> >>>>>> dba Vermont Solar Engineering >>>>>> >>>>>> 802.559.1225 >>>>>> _______________________________________________ >>>>>> List sponsored by Redwood Alliance >>>>>> >>>>>> Pay optional member dues here: http://re-wrenches.org >>>>>> >>>>>> List Address: [email protected] >>>>>> >>>>>> Change listserver email address & settings: >>>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>>>> >>>>>> There are two list archives for searching. When one doesn't work, try >>>>>> the other: >>>>>> https://www.mail-archive.com/[email protected]/ >>>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>>> >>>>>> List rules & etiquette: >>>>>> http://www.re-wrenches.org/etiquette.htm >>>>>> >>>>>> Check out or update participant bios: >>>>>> http://www.members.re-wrenches.org >>>>>> >>>>>> >>>>> >>>>> -- >>>>> >>>>> Michael Morningstar >>>>> >>>>> >>>>> Morningstar Electric Inc >>>>> >>>>> PO Box 1494 >>>>> >>>>> Mount Shasta, CA 96067 >>>>> >>>>> 530-921-0560 >>>>> >>>>> CSLB 1116835 >>>>> >>>>> [email protected] >>>>> >>>>> >>>>> _______________________________________________ >>>>> List sponsored by Redwood Alliance >>>>> >>>>> Pay optional member dues here: http://re-wrenches.org >>>>> >>>>> List Address: [email protected] >>>>> >>>>> Change listserver email address & settings: >>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>>> >>>>> There are two list archives for searching. When one doesn't work, try >>>>> the other: >>>>> https://www.mail-archive.com/[email protected]/ >>>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>>> >>>>> List rules & etiquette: >>>>> http://www.re-wrenches.org/etiquette.htm >>>>> >>>>> Check out or update participant bios: >>>>> http://www.members.re-wrenches.org >>>>> >>>>> _______________________________________________ >>>> List sponsored by Redwood Alliance >>>> >>>> Pay optional member dues here: http://re-wrenches.org >>>> >>>> List Address: [email protected] >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> There are two list archives for searching. 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