Yeah, when you live far up the globe as you do, the solar energy drops off significantly. And that makes it harder for the economics to pencil out.
However, I understand that Germany, overall, has about the same solar incidence as Seattle (America's lowest sunlight city). And the Germans have made a commitment to going 100% renewable by mid-century. So they obviously believe that they can make solar work even in what we would consider to be a low light environment.
It's surprising, but a lot of the energy from solar gets through even a dense cloud cover. Seattle, with its low light location, and dense cloud cover, still gets half as much solar energy as New Mexico (our state with the greatest solar potential).
All of these stats are from memory, but I didn't make any of this up.
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