“My solar inverter beeps and disconnects from the grid whenever it detects that the grid power deviates too far from 60 Hz”
Why doesn’t your inverter grid follow? Mine will adjust phase to follow all the way down to 59 hz or lower. Inverters don’t have reactive power requirements they can follow any phase angle or hertz with ease. No home has an inertial load that needs reactive power , even AC compressors the largest reactive loads in a residence are a fraction of the total load. I have two large compressors and both can be driven directly from my inverters with little loss in power factor. The only reason my inverters will trip is the grid is pulling more than they can push out and that’s gonna be a phase angle well more than 1hz which means the grid itself is down they will follow deep into 59.2 hz. I don’t habe small systems I crossed 100 kw recently on property , the windmill is up now a 50kw variable pitch on a 30 meter monopole.
To clarify, when my inverters disconnect from the grid, the power doesn’t go out in the house. So far, the disconnects haven’t happened during the few times I need the grid. I believe the other the inverters that make the adjustments that you describe are the ones that can’t power the home without maintaining a connection to the grid.