The IQ8 are supposed to be able to respond fast enough to prevent this. Is this not the case?This is my solution to avoid over producing PV when off-grid.
Building a PV Shedding Controller for AC Coupled Solar
Back Ground I have an Enphase system with 35*350 watt panels. It uses the IQ8+ micro inverters at 295 watts each. So the total possible output is 10,325 watts. The actual maximum output is about 9000 watts. I have 7 panels that face east and 28 that face west. The slope of my roof is about...diysolarforum.com