FA-93729 / Solar tracker geometry / Member archive

Anemometer fail-safe stow voting: required sensor count · case 04

The plant stows for sensor failure although enough anemometers report.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

readings are [value or None, age_s] per anemometer. A reading is valid when value is not None and age <= max_age. Fewer than n_required valid readings: ['stow', 'sensor', None]. Otherwise use the highest valid value: >= stow_at gives ['stow', 'wind', v], else ['track', 'ok', v].

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: reading exactly max_age old	`["stow", "sensor", null]`	`["track", "ok", 10]`	Failed

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

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