Horizon Shading Calculator

Estimate annual energy loss from horizon obstructions (trees, buildings, terrain) at specified azimuth angles.

Input Parameters

Results

--
Elevation Angle
°
--
Azimuth Span
°
--
Est. Annual Energy Loss
%
--
Winter Energy Loss
%
Note: Obstructions in the south (150°-210°) cause the most energy loss. Winter losses are amplified due to low sun angles.

Reference

Elevation Angle = arctan(Height / Distance) Azimuth Span = Az_end − Az_start Annual Loss ≈ (Az_span/360) × (Elev/90) × South_weight × 25% Winter Loss = Annual Loss × Winter Factor Winter Sun Elev = 90 − Latitude − 23.45°