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 < [email protected]> 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 < > [email protected]> 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 <[email protected]> on behalf > of William Miller via RE-wrenches <[email protected]> > *Sent:* Saturday, August 9, 2025 1:03 PM > *To:* RE-wrenches <[email protected]> > *Cc:* William Miller <[email protected]> > *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 < > [email protected]> 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 < > [email protected]> 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 < > [email protected]> 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 < > [email protected]> 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 < > [email protected]> 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: [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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