FA-93628 / Solar tracker geometry / Member archive

Cross-axis slope aware backtracking: angle relative to slope · case 03

Rows backtrack on the downhill side when they should on the uphill side.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Rows on terrain with cross-axis slope cross_tilt degrees. dist = 1/(gcr*cos(cross_tilt)); temp = dist*cos(ideal - cross_tilt). When temp < 1 the angle becomes ideal - sign(ideal)*acos(max(temp, -1)) degrees, else ideal. The result is then clamped to +-max_angle. Return the angle rounded to 3.

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: clamp after backtracking	`50`	`-10.0`	Failed

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