[t_tsonev]

As far as the US is concerned, there are no stricly "bad" locations for solar. Even using them in Alaska makes sense.

[davidy123]

As long as you don't mind constantly removing snow from the panels, hopefully not damaging them in the process.

[t_tsonev]

At these latitudes the optimal slope is 40+ degrees which is pretty steep by roof standards. I don't know how much of an issue it is in practice.

[davidy123]

Snow and ice. Deep snow, deep ice. Layers of ice, then snow, then ice, created within a couple hours. I think even if it slides off, that could cause some damage.