Factor for production dip away from 180 degrees?

lasitterlasitter Solar Expert Posts: 56 ✭✭
Is there a rule of thumb for solar production as the panels are tilted away from the ideal azimuth? Say, for every 10 degrees off of 180, your production drops "x" percent.

I know that there are very specific tools that I can use for very precise array azimuth / tilt for a given latitude, but I figured there must be some quick and easy approximation somewhere for this ...


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