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18 hours agoIn the Northern hemisphere, in Winter the Sun is at a low angle, so vertically oriented panels might produce more. As an example, I have a sunroom and at Winter’s Solstice the sunlight reaches about 3-4 meters into the room. At Summer’s Solstice there is no direct sunlight in the room, as the Sun is overhead.
I have a sunroom, what sort of numbers are you asking for? It’s a partly cloudy day, about 22C in the room, without heat. And about 7C outside.