How to use the Solar Panel Tilt Calculator
The Formula
For year-round fixed mounts, tilt ≈ latitude (absolute value). Example: 40°N → about 40° tilt from horizontal.
Practical Example
Summer: latitude − 15°. Winter: latitude + 15°. Adjust azimuth toward equator for best annual yield.
About Solar Panel Tilt Calculator
Tilt rule of thumb
For year-round fixed mounts, tilt ≈ latitude (absolute value). Example: 40°N → about 40° tilt from horizontal.
Seasonal adjustments
Summer: latitude − 15°. Winter: latitude + 15°. Adjust azimuth toward equator for best annual yield.
Frequently asked questions
Q: Is this exact? A: It's a starting estimate—local shading, roof pitch, and utility TOU may favor different angles.