The cables on my panels
are cable tied to the supports, then have them enter into the fiberglass
structure to be nicely hidden. The MC4 connectors seem to be as water
tight as a frogs butt under water
. No problems for over 8 years !!
I had the local Stainless Steel
welding shop make me the 304 brackets holding my panels secure. I wanted the panels to look like they grew there, and off the shelf brackets needed too much modification, so custom was my best option (and cost less with perfect result).