Can the solar rack have a steeper angle than the roof, with the 'clip to solar array' attachments being progressively taller as you move up slope?
That would create a massive snow-holding wedge, and the snow/ice would just peel the panels from the roof, in this climate anyway.
They could angle the individual panels for better gain, but our solar subcontractor has had a very bad experience doing this in the past. Something to do with high winds picking the panel and roof up off the house. Our location is particularly windy at a bad angle, so.. not in this case.
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