[RE-wrenches] Leakage of current

[Ron Young]

I have a customer that has self installed an array on a metal roof using APS Rapid shutdown devices. The roof rack is standard rails and L-feet. It is a high voltage system that will be connected to a Sol-Ark but it has yet to be connected, just MC cables from each set of 8 panels (3 altogether) run back to the location where the Sol-Ark will be installed. He raised a concern about what he described as leakage of current to the metal roof:

"I did experience noticeable “leakage” of current to our roof prior to installation of the ground cable...Working around the metal roof one could definitely feel the tingle of the current, and it persisted until I had the ground cable connected.”

My only guess is that possibly the APS devices are leaking at connection point but not sure how to check or he had an unprotected end of the MC cable touching the roof but that wouldn’t leak with the APS shutoff installed as it would need a signal from the transmitter that is not yet installed in the Sol-Ark. The panels are LG375’s.

Ron
earthRight Solar - Solareagle.com