I have 3 85 watt kyocera
panels on my boat.
I was not aware there was any grounding effect by attaching bolts through the aluminum
frame on the panel. I have my three panels bolted through the aluminum frame directly to my aluminum davits
. The bolts are insulated with teflon sleeves from both the davits
and the frame on the panels, but the panels are in direct contact with the davits.
I see no pitting or peeling paint
- but that does not mean it is not there
My understanding of the frames is that there is glass (or equivilent) on top of the silicon and therefore non-conductive and there is a wheatherproof backing on the bottom (non-conductive) and a rubber gasket
holding it all in the frame - also non-conductive.
IMO if you are running a two wire system on your boat and not running any grounds you should not have a problem.
I am in no way an expert but after looking closely at the panels I dont understnad how bolting the frame to your boat would in any way consitute a ground.
Please if any one knows otherwise I would like to know as well so I can kick myself and redo my installation!