The exact wording for state code 302 is: “Brief interruption of grid power feed operation due to overcurrent in the inverter. The inverter returns to the startup phase.”
I wonder if this has something to do with the fact that the inverter is 64% over panelled, even though both the panel voltages and currents are individually within specification. There’s no indication on the datasheet that there is a limit to over panelling the Galvo, but its sister model, the Primo, is limited to 50%. I would expect the electronics to be similar.
Perhaps it’s a case of the inverter not being able to raise the voltage fast enough in order to bring the current under control when the sun peeks out from behind a cloud? Does that sound plausible?