I am envious of this opportunity. Keep us up to date on it! I forgot that the 18K is coming out with the 350A DC charging capability.
I'm still thinking that a containerized battery might be something to consider. If using Sol-Ark, presumably you are looking at one of their battery partners. Maybe they can assist with bus options. 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 3:32 PM david quattro <[email protected]> wrote: > Qty 12 of SolArk 18K is the thought. > I’m thinking about 400-500kWh battery. I have been in deep, careful > conversations with all branches of AHJ such as Planning, Building, and > Fire. They all support this design. Fire Dept was the key, as they had > final say as to whether they’d allow it. I was pleased to hear that Fire > dept prefer this design over 5 disparate systems of 80kWh each and 5 small > generators; their logic is that it’s safer to have all the generating > equipment in one spot. > Understandably they will require a separate Utility Building > constructed of fire proof materials, with adequate ventilation, fire > suppression, and a heat alarm that’s internet monitored by me. cool idea. > > > > On Fri, Dec 19, 2025 at 12:13 PM Jason Szumlanski < > [email protected]> wrote: > >> 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 < >> [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 >>> >>>
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