According to Google, Project Sunroof recommends an installation size to generate close to 100% of your electricity use, based on roof size, the amount of sun hitting the roof, and your electricity bill. They use Google Maps' and 3D modeling of a roof and they also take into account shade from nearby objects like trees, possible sun positions and cloud and temperature patterns in the area.
It will tell you how many hours of usable sunlight your roof is exposed to and calculate the savings for installing solar panels.
As the price of installing solar has gotten less expensive, more homeowners are turning to it as a possible option for decreasing their energy bill. We want to make installing solar panels easy and understandable for anyone.
Project Sunroof puts Google's expansive data in mapping and computing resources to use, helping calculate the best solar plan for you.