|April 3rd, 2020|
4301: The inverter has detected an electric arc. The inverter interrupts grid feed-in and cannot connect to the utility grid.
8206: The inverter has detected an electric arc and was recommissioned after a disconnection.
The inverter can take up to three strings, and ours is configured with two. A sensible inverter would track which of the strings the arc fault had been on, to help narrow down the problem, but apparently this one doesn't. The techs decided to turn off one of the two strings, and see if the fault re-occurs. Based on four faults in 18m, with the longest interval of 6m, you'd need to wait about 8m with no faults before being pretty sure the problem was with the disconnected string. This seems like a long time to be producing at half capacity, but apparently inspecting an installation on a steep roof to locate an arc fault is very difficult? This doesn't make much sense to me, but also I don't know much about it and kind of need to take the techs' word for things.