Panel Grounding on Standing Seam Copper Roof

[Ted1000]

I'm adding 9 (390w) panels on my wife's studio which has a copper standing seam roof. I'm using S-5-B clamps with S-5-PV kit 2.0 mounts (so rail-less). The copper roof is connected to earth ground using 2 grounding rods. I think the main load center's ground is connected to the same grounding rods but I built this building 20 years ago so I might be miss-remembering. My plan was to also run a ground wire from each panel to the inverter's (EG4 6000xp) PE bus bar but wasn't sure if this is correct. The S-5-PV mounts have little teeth on the bottom plate so I'm sure there will be a good connection between the panels > roof > earth ground. I was worried this might be a problem (ground loops?).

Ted

 

[timselectric]

Electrical safety grounding is not accomplished by connecting to earth, it's accomplished by connecting to the grounding system. Which is connected to the source, through the N/G bond.

My plan was to also run a ground wire from each panel to the inverter's (EG4 6000xp) PE bus bar but wasn't sure if this is correct.

This is correct. Assuming that bar is connected to the grounding system.