8awg Solar Prewire, now what?
I must admit I have no problem mounting solar panel feet directly to the roof using VHB 3-M tape and caulking/sealing the tape from damage with Sikaflex or the like.
Because my panels have aluminum frames, and I also have ham radio transmitting antennas close by on the roof, I have found it necessary to drill holes and use Rivnuts or Olympic rivets to very tightly electrically bond the panels and feet to the roof structure for RF safety. Getting RF into the solar system is not a great idea. I dislike getting zapped as well.
In most normal cases using VHB tape and sealant is more than sufficient to keep the panels on the roof.
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.