The angle or pitch of your roof actually has less impact on solar panel performance than the direction it faces. In general, optimal production occurs when solar panels face south at a tilt equal to 30°. But what happens if your roof is flat? Lowering the tilt all the way down to 5° only decreases production by about 10%, regardless of where you live. The difference in production for steeper roofs is barely noticeable. Increasing the tilt from 30° to 40°, for example, results in a negligible decrease of about 1%.
Looking at data from six cities- Boston, Los Angeles, New York, Chicago, Philadelphia, and Washington, D.C., Energy Sage estimated the production levels generated at various tilt angles. They held the azimuth constant at 180° which in laymen’s terms means they always assumed that the roof faced directly south. What they found was consistent with their investigations into the effects of other variables.
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