arc fault triggering observation

[australsolarier]

i have a 48v system with 4 midnite classics in follow me mode. as i have previously experienced the sensitivity needs to go up. all midnites triggered arc fault below 12.
having rewired one of the classics with new multiple strings , rather long, the longest string 30m or thereabouts. this midnite had worked alright with another group of strings. that midnite  was triggering arc fault in the mornings. so i raised the sensitivity.
what i observed, i just happened to turn on the split inverter air conditioner. the remote is 5m from the status panel. 5m back and the status panel was red.  inverter air conditioners have soft starts, and it is the smallest model in the market, 600w at full power. the solar DC cable passes the AC supply for the indoor unit of the aircon. it "T's" it, but still 10cm apart at the top of the T.
just thought i am mentioning it here.

[ClassicCrazy]

Are you saying that the AC cable and the DC cable together is what caused the arc fault ? AC induced into the DC line ?

Larry

[australsolarier]

classic crazy,
it looks like that. but of course it is all a mystery. it is just an observation, certainly not conclusive