Which pv cells are the best?
Of the two types I am familiar with, mono crystalline and poly crystalline silicon wafer. Mono is slightly better in terms of size to power output.
You can easily spot the difference, with the poly crystalline cells you will notice that it looks as if the crystals are pointing in all directions and are all different shapes and sizes.
How do I keep snow off my PV panels in winter?
if they tilt do so or by the installation kit so they can be tilted. a long handled broom may also help once a small spot is cleared they will heat enough to melt the snow right off.