What is there to ground? The cells are tightly contained in their plastic film and cannot leak out. The frames are not electrified ever.. It is just the wires coming out of the panels that are the most open to anything happening where a short could occur, and one of those is grounded to the negative battery stud, which might be grounded to the chassis. If you had a 12v+ short to the frame (for those using frames vs the flexible panels) then what happens? you get low voltage 12v passing through you that you may not feel? At this point the panel is ruined probably, so what is there to protect?-just curious
