Light snow usually won't stick

[Travis_0004]

Pannels are smooth, and usually angled to get the most sunlight, so under light snow it doesn't stick.

If you get heavy snow it will stick on the panels, and somebody has to shovel it off.

I would also imagine that if they were very low on the roof they would be covered, and you would have nowhere to put the snow. (throwing wet snow off a skyscrapper is not a good idea.)

There would be several times a winter where somebody would have to clean them off.