See the comment from bjelkeman! I don't have any "hard" sources but reserarching solar panels for myself by hanging around Swedish solar forums and noticed peo

See the comment from bjelkeman! I don't have any "hard" sources but reserarching solar panels for myself by hanging around Swedish solar forums and noticed people way up north still get a good yield from their panels. Most of the energy comes from ambient light, direct light is best of course but not strictly needed