I don't think any AIO manufacturer recommends AC Coupled only. Tesla, oddly, specifically markets adding Powerwall 3 to existing solar. Franklin fully embraces AC Coupling for obvious reasons.
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 Sat, Aug 9, 2025 at 3:12 PM Jay via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Thx I looked it up. > But according to midnite they don’t recommend a only ac coupled system. > > Jay > > On Aug 9, 2025, at 12:53 PM, Dave Tedeyan via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > > The Midnite Power AIO has inputs for grid, generator, AC coupling and > another smart load. I have not used both generator and AC coupling to see > how it acts if both are active at the same time, but at least the inputs > are there for them both. > > On Sat, Aug 9, 2025, 2:33 PM Jerry Shafer via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Jason, Wrenches, >> Consensus well that may not be the correct word to use, personally l have >> used Solark for retrofitting systems that already have GT type inverters, >> if you go with AC Coupling then the gen set connection is a little more >> complicated but very doable. >> Funtimes >> >> On Sat, Aug 9, 2025, 11:26 AM Jason Szumlanski via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >>> I go with "Backup Loads" on my drawings. >>> >>> Tesla will not charge from a generator. But you can obviously have a >>> generator power the loads via a transfer switch if the battery is >>> completely depleted. It's not the best solution, for sure. >>> >>> >>> 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 Sat, Aug 9, 2025 at 1:57 PM jay via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>>> Yeah I’ve given up trying to correct people on that one. >>>> >>>> >>>> >>>> On Aug 9, 2025, at 11:26 AM, Foxfire Energy via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>> Umm, just an FYI, I actually got dinged for labeling the AC output >>>> panel from a battery backup inverter as "Critical Loads".. Critical loads >>>> (Critical Branch circuits) are defined in article 100 of the NEC as >>>> circuits associated with Patient Care.. AC loads from battery backup >>>> inverters are more appropriately defined as "Dedicated Loads".. >>>> Maybe someone could correct me here, but I'm under the impression most >>>> garden-variety inverters are not rated for Critical Load applications. >>>> db >>>> ------------------------------ >>>> *From:* RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> on >>>> behalf of William Miller via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> >>>> *Sent:* Saturday, August 9, 2025 1:03 PM >>>> *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> >>>> *Cc:* William Miller <will...@millersolar.com> >>>> *Subject:* Re: [RE-wrenches] Adding battery to grid tie >>>> >>>> Correct me if I'm wrong: I believe AIOs can accept AC coupled power >>>> through the load ‘output’ port. That leaves the Grid and Gen inputs free >>>> for their roles as labelled. >>>> >>>> The AC coupled inverters connect via a breaker in the critical loads >>>> panel. >>>> >>>> >>>> William Miller >>>> Miller Solar.com >>>> 805-438-5600 >>>> www.millersolar.com >>>> >>>> >>>> On Sat, Aug 9, 2025 at 9:50 AM david quattro via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>> True. if you want to do grid, gen, and AC Couple then you need a >>>> transfer switch or contactor. >>>> Likewise I haven’t touched a Powerwall, nor an Enphase battery. >>>> >>>> >>>> >>>> On Sat, Aug 9, 2025 at 9:36 AM jay via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>> One big issue with the AIO’s is that you can’t do grid, generator and >>>> ac coupling to the best of my understanding >>>> >>>> I do like the idea of just removing the old GT inverter and stuffing >>>> that into the AIO, elegant >>>> >>>> yes its my understanding that Tesla won’t accept generator. While many >>>> are pissed off at eg4, I won’t touch tesla. >>>> >>>> and FYI you can buy the same inverter at Fortress. >>>> >>>> thanks everyone. >>>> >>>> jay >>>> >>>> >>>> >>>> On Aug 9, 2025, at 10:28 AM, Tyrone Houck via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>> Midnite AIO and Sol-Ark both work great for AC coupling in my >>>> experience. If anyone is new to "All In One" inverters I recommend having >>>> tech support walk you through commissioning, check firmware, etc. the first >>>> time. >>>> >>>> >>>> >>>> >>>> On Sat, Aug 9, 2025, 8:47 AM William Miller via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>> Two options: >>>> >>>> 1. AC couple existing inverter to a battery capable inverter. >>>> >>>> 2. Replace existing inverter. >>>> >>>> I favor option 2. >>>> >>>> Option 1 is only preferred if gaining access to the existing inverter >>>> for replacement is difficult. An example would be a micro-inverter system. >>>> >>>> New AIO inverters allow true high voltage PV input so the existing >>>> stringing will probably not need to be modified. >>>> >>>> I’m new to this so type of upgrade so I welcome any corrections to >>>> these opinions. I did replace a Sunny Boy in my shop with a Soul Ark and >>>> it’s working great! >>>> >>>> William Miller >>>> Miller Solar.com >>>> 805-438-5600 >>>> www.millersolar.com >>>> >>>> >>>> On Sat, Aug 9, 2025 at 8:26 AM Jay via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>> Is there a consensus as to what equipment to use for adding battery >>>> backup to normal GT inverter? >>>> >>>> >>>> >>>> I’ve had a few people ask and I actually haven’t done it. >>>> >>>> Thx >>>> Jay >>>> >>>> >>>> _______________________________________________ >>>> List sponsored by Redwood Alliance >>>> >>>> Pay optional member dues here: http://re-wrenches.org >>>> >>>> List Address: RE-wrenches@lists.re-wrenches.org >>>> >>>> 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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