How Google Sunroof Works Employing the high-resolution aerial mapping used by Google Earth, Project Sunroof calculates the amount of sunlight reaching your roof to assess its potential for solar power. It takes a variety of factors into account including local weather conditions, shade from nearby trees and buildings and sun positions throughout the year. The tool combines this information with data from your household’s monthly electricity bill, factors in panel orientation and tilt to the roof surface to calculate average monthly and annual solar radiation, recommends the size of solar installation needed and estimates the cost to purchase or lease
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