For most locations in the United States, optimal tilt angles range from 15-45 degrees, with seasonal adjustments providing the greatest benefit. Southern latitudes typically require lower angles (15-30 degrees), while northern locations benefit from steeper angles (30-45 degrees).
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Here's a look at the best solar panel angles of 30 major US cities: Scroll to the top of this page to use our Solar Panel Tilt Angle Calculator.
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In general, solar panels should be installed so the sunlight hits them at as close to a perpendicular 90-degree angle for as long as possible during the day.
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Ideally, the angle should be 90o but practically it should be as close as 90o. The solar cell is a two-terminal device. One is positive (anode) and the other is negative (cathode).
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