I have a single 40W solar panel that I'd like to mount to my shed's corrugated iron roof without drilling holes in the roof. Reason is I don't want to create a leak and I'm only ok at DIY. I could pay someone, but that's not the kiwi way.
The place I bought my solar panel said I could bolt the panel onto some 2cm thick wood rails, then silicone the wood to the roof. The wood is to create a small air gap, to keep the panel cool. I think he suggested attaching the wood down the long side of the panel, leaving only the shorter top and bottom open, to reduce wind going through but still giving enough cooling. This is in Wellington, which you may be aware gets some wind.
An alternate approach is these brackets, made for caravans, which do appear to regularly be attached with silicone. Caravans aren't corrugated though.
Does this sound reasonable to anyone? Is silicone strong enough to hold a solar panel to a roof in Wellington reliably? If it comes off it in a storm could really hurt someone, probably me.
Panel Dimensions: 670 mm × 420 mm × 30 mm
Panel Weight: Weight: 3.1 kg
Use: running small greenhouse ventilation fan, keeping emergency batteries charged