Build a 60 Watt Solar Panel

Step 12 Run wires outside and put the Plexiglass covers on

I drilled a hole in the back of the panel near the top for the wires to exit. I put a knot in the wires for strain relief, and anchored them in place with yet more of the silicone caulk.

It is important to let all the silicone caulk cure well before screwing the plexiglass covers in place. I have found through past experience that the fumes from the caulk may leave a film on the inside of the plexiglass and on the cells if it isn't allowed to thoroughly cure in the open air before screwing on the covers.

And still more silicone caulk was used to seal the outside of the panel where the wires exit.