Estimate the best solar panel tilt angle for fixed panels, seasonal adjustments, roof-mounted panels, adjustable mounts, RV solar, cabin solar, and off-grid systems. This calculator estimates annual tilt, summer tilt, winter tilt, roof tilt, production difference, annual kWh, and energy value.
Fixed tilt mode:
The calculator estimates a year-round fixed solar panel tilt using absolute latitude.
Seasonal mode:
The calculator estimates summer, winter, and spring/fall tilt settings for adjustable solar panel mounts.
Roof mode:
The calculator converts roof rise and run into roof tilt, then compares that roof tilt with the recommended solar tilt.
Production mode:
The calculator estimates daily, monthly, and annual solar production using tilt difference, system efficiency, shading loss, and peak sun hours.
A solar panel tilt calculator helps estimate the best panel angle before installing panels, adjusting seasonal mounts, comparing roof pitches, or designing a ground-mounted solar system.
It can help compare fixed tilt, seasonal tilt, roof tilt, production difference, annual energy value, and the possible benefit of adjusting the panel angle.
Your result shows the recommended tilt for your goal, best annual tilt, summer tilt, winter tilt, spring/fall tilt, roof tilt, current tilt difference, estimated production factor, annual kWh, annual energy value, and estimated value lost from non-ideal tilt.
A common rule of thumb is to set solar panel tilt close to your latitude for balanced year-round production.
For summer output, use a flatter tilt, often around latitude minus 15 degrees.
For winter output, use a steeper tilt, often around latitude plus 15 degrees.
Usually, yes. Many rooftop solar systems follow the roof pitch because changing tilt can add cost, complexity, wind load, and mounting requirements.
No. This is an estimate. Actual solar production can vary based on local sun path, roof direction, shading, panel type, weather, snow, mounting limits, and installation conditions.