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Google are doing this by using what they already have available in Google Maps, and using the path and angle of the sun, generating a guide to how much solar energy your roof collects based on surrounding shade sources like topography, trees, chimneys and tall buildings.
While the area available is still very restricted (even tech giants need time to scale), SkySolar are quite excited about this development from Google and we’ll follow it with great interest, bringing you any updates as they happen.
Check out a bit more detail here: https://www.google.com/get/sunroof/about
