FA-93704 / Solar tracker geometry / Member archive

Tilted single-axis tracker frame: axis vector tilt · case 04

Incidence angles on tilted-axis rows are underestimated in the morning.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

The axis points toward axis_az rising by axis_tilt: A = (sin a cos b, cos a cos b, sin b). The zero-rotation panel normal is N0 = (-sin a sin b, -cos a sin b, cos b) and positive rotation turns toward R = (cos a, -sin a, 0). With unit sun vector s, rotation = atan2(s.R, s.N0) and the incidence at ideal tracking is asin(|s.A|). Return [rotation, incidence] rounded to 3, or None 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
normal: tilted axis morning	`[-71.564, 9.391]`	`[-71.564, 12.714]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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