Regarding solar panels in northern climates/latitudes:
Panels are more efficient in colder temperatures than warm.
Panels have to be oriented towards the sun both winter and summer. In the summer they're nearly horizontal while in the winter they are nearly vertical. Thus they tend to shed snow...well for the most part anyway. If the snow is wet or it arrives when then panels are warm enough, then you get an icing condition similar to what you'd expect to find on your car's windshield if it where to snow on it over night. Just brush it off the best you can and when the sun hits it it'll melt off just fine.
But the best part when there's a lot of snow on the ground is there's a lot of reflected light. This can be a significant amount of energy and should be considered while planning you installation requirements i. e. bigger charge controller.
Just for fun I ran out and checked my system; half the panels are covered and half are not (we got six inches of new stuff over night) the battery bank is at 13.1 and charging. If the batteries where low I might brush the snow off but they'll shed it in another 1/2 an hour or so.
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