That wire goes down to a current transformer around the neutral wire at the bottom of the panel-you…

monkeyswrench said:

The ginormous breaker, I’m pretty sure it’s a breaker, looks to have a communication line. Is it a controlled switch type deal, or does it report info to the inverters?
On giant inverters, do they still run “master and slave”, or do they do their own thing?

Click to expand…

That wire goes down to a current transformer around the neutral wire at the bottom of the panel-you can see it in this picture below-it gives the breaker ground fault detection.