You can use all 4 Smart Load inputs on the Gridboss simultaneously for AC Coupled PV and there is a separate dedicated Generator input.
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 Tue, Oct 20, 2026 at 12:16 AM Zeke Yewdall <[email protected]> wrote: > I don't know of any AIO's that allow AC coupling on the backed up loads > panel rather than the dedicated AC coupled input. It's an issue of > monitoring and controls, not physics. The physics would work the same > either way, but the inverter wants to know what is going on, and control > that AC coupled input so it can turn it off if needed. Same with the ones > using an external gateway like the Gridboss, or the Powerwall type ones > that use a gateway for the AC coupled PV input, at least the ones I've > designed for (Franklin and Sigenergy). Those won't allow the AC coupled PV > on the backed up loads panel either. > > I think Victron still allows AC coupled PV on the loads output and can > handle that fine, perhaps with a bunch of external CT's and a cerbo to tell > it what's going on instead of trying to handle it all internally. > > Technically I think code required a secondary method of dropping the AC > coupled array on older systems, but we usually just hoped that the > frequency shifting would work the way it was supposed to (sometimes it did, > sometimes it was way to slow and the lithium BMS would cut out before the > inverter shifted and knocked the AC coupled array off, and at least once I > saw an AGM battery bank very pressurized and unhappy when the AC coupled > array did not cut out). In theory, the frequency shifting on an AIO would > also drop the AC coupled array, even if it was not on the AC coupled input > where the relay can drop it. But even if so, the monitoring is still going > to be messed up for what the inverter shows as solar production. > > The Sol-max AIO has separate AC coupled PV and Generator inputs, so you > can have both wired in at the same time, and still have a smartload output > available too. The Franklin gateway and I believe the Signeergy gateway > also have separate inputs for AC coupled PV and Generator and smartload > outputs so you can do all three at once. Not sure about the Gridboss > gateway. But a lot of the AIO's by themselves you have to pick just one. > > Zeke > > ---------------------- > > Can you AC couple the old fashion way, by back-feeding a breaker in the > protected loads panel, to save the generator input? > > Drake > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > > https://lists.re-wrenches.org/mailman/options/re-wrenches_lists.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]/ > https://lists.re-wrenches.org/pipermail/re-wrenches_lists.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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