Attached is a photo of a ground lug on a solar panel. This installer is going around installing dozens of them like this, and the inspectors don't mind at all since they've never seen solar panels before anyway and don't know better. Here is the setup:
Aluminum solar panel frames are mounted on a galvanized steel frame. There is no aluminum mounting rail nor WEEB. As galvanized steel is not a decent conductor, the installer has added a copper ground wire, using the type of lug shown in the picture. The lug is attached with a self-tapping screw, but I could not tell if it was a galvanized steel or stainless steel self-tapping screw. It looks like a bugle head (cone head) screw, with no toothed lock washer underneath it. The lug looks like it is listed for CU-AL. This ground connection is accessible from the bottom, as it is a grade-mounted array, so it could presumably be removed if a panel was being serviced by removing the self-tapping screw. I suppose this satisfies 690.4(C) which requires that removal of a panel does not interrupt the ground for another panel. If this was a roof mounted array I don't see how it would comply. The installer used Noalox goo on the copper wire, I suppose to keep the copper and nearby aluminum from corroding. Will that wash off in the rain? Does it even work on copper?
OK, let's see how many things we can find wrong with this grounding installation? I think there are several but I'd like to get some other opinions.
What could be changed to make it right?