FA-93800 / Solar tracker geometry / Member archive

Hazard stow angle selection: snow row parity · case 05

Snow-shedding rows tilt the opposite way from the plan, shedding onto the next row.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Priority: wind >= 20 m/s gives [0.0, 'wind']; then a manual angle (clamped to +-max_angle) gives 'manual'; then hail from azimuth hail_from gives +max_angle when (hail_from - axis_az) mod 360 is strictly between 0 and 180, else -max_angle ('hail'); then snow alternates rows: even rows +max_angle, odd rows -max_angle ('snow'); otherwise [None, 'normal'].

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: snow on odd row	`[60.0, "snow"]`	`[-60.0, "snow"]`	Failed

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