Indeed @kynan, I would bet you are right. Any given inverter should have a fairly straightforward correlation between “startup time” (threshold) and total bus capacitance.
@andy, this relates to thoughts I’ve been having during a conversation with @kevin1 about the rate of change of inverter anomalies (potential failures) vs panel & inverter degradation (slow) vs the speed of clouds==>maximum possible rate of change in solar waveform due to clouds/weather. This points to the disaggregation potential of the solar wave.