FA-93408 / Solar tracker geometry / Member archive

Fixed panel angle of incidence: back-side projection · case 03

Irradiance projection becomes negative when the sun is behind the panel.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Panel tilted by tilt degrees from horizontal, facing pan_az (clockwise from north). zenith = 90 - sun_el. cos(aoi) = cos(zen)cos(tilt) + sin(zen)sin(tilt)cos(sun_az - pan_az), clamped to [-1, 1]. Return [aoi degrees rounded 3, max(cos aoi, 0) rounded 4, 'front' or 'back'], or [None, 0.0, 'night'] when sun_el <= 0.

Why this case matters

Single-axis and dual-axis solar trackers turn a sun direction into actuator commands; a sign, frame or limit mistake points a whole plant away from the sun or into a mechanical stop.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
boundary: sun behind vertical panel	`[160.0, -0.9397, "back"]`	`[160.0, 0.0, "back"]`	Failed

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