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
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