adminandClaude Opus 5.5
6918e154c8
B's power reading shows -95 to -118 W at idle (standby draw), so the |reading| < 100 W refusal band never held a refusing B: never at N=2, and since SAFETY-94's shared rule not at N=1 either (review F1). Each unit now learns its idle reading (app/idle.py): only while control runs, the unit is not refused/stale/tripped and its command has stayed within 50 W for 120 s; first value a 120 s mean, then a 30 min follow; samples beyond 250 W dropped, value clamped to 250 W; saved per unit and restored. The shared refusal evidence, compute()'s N=1 engage and end, the unit refusal ends, the stale-path refusal and SAFETY-42's "parked" test are centred on it. Until learned it is 0 W, the rule as it was. Refusing B caught at N=1 28/28/65 s and N=2 24/24/60 s (1/2/5 s meters), before never; refusing A unchanged. Healthy B with its offset, SAFETY-94's scenarios, 96 runs: 0 stale, 0 refused. Live replay: 0. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_019DBUfvndgHwaV339Fvd2gr
85 lines
4.2 KiB
Markdown
85 lines
4.2 KiB
Markdown
# SAFETY-97 - "gives nothing" is graded against each battery's idle reading
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**Status: implemented 2026-10-04, folded into PR #171 (SAFETY-94), for
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review.** Tests: `test_safety97.py` (rig: `tools/safety94_rig.py`). Closes
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SAFETY-94 review finding F1.
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## The defect
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B's power reading (board B's `inverter_ac_power`, 0x0518) shows -95 to -118 W
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at idle: its standby draw (the GoodWe app shows 0 W). A's shows -2 to -4 W.
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Every "the battery gives nothing" test was `|reading| < 100 W`, so a refusing
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B sat on the band's edge and never latched:
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- N=2: never caught, before or after SAFETY-94.
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- N=1: the old one-instant check caught it in 17-105 s; SAFETY-94's shared
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rule (12 cycles in the band in a row) never did (review probe, 1200 s).
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## Design
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- **Offset source: learned per unit** (`app/idle.py`, `Inverter.idle`). No
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new option: a required one is a setup step every client gets wrong, and an
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optional one is a second source to reconcile. An override can be added
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later if a site needs one.
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- **When it learns:** control runs; the unit is not refused (unit or site),
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stale or sign-tripped; its command has been within 50 W (`IDLE_ASK_W`) for
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120 s (`IDLE_QUIET_S`, 6 lags of 20 s). A refusing battery is asked more
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than 50 W, and while refused it does not learn, so its refusal cannot be
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learned as idle. A capped battery under a big ask is not sampled either.
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- **How:** the first value is the mean of 120 s of samples; then it follows
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drift with a 30 min time constant. A sample beyond 250 W (`IDLE_MAX_W`)
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is dropped (a register held at a giving value); the value is clamped to it.
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- **Restart:** saved per unit (`unit/<name>/idle_w`, on first learn and each
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5 W move) and restored, clamped. Without it a battery refusing from the
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start is never quiet, so never learned, so never caught.
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- **Until learned the idle reading is 0 W**: the rule as it was.
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## Where it applies
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Every test of "gives nothing / gives / takes" now uses `reading - idle`:
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| check | change |
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|---|---|
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| shared refusal evidence `_gave_nothing` (N=1 and N>=2) | centred |
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| N=1 engage and end in `compute()` (`idle_w`, the site sum) | centred |
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| N=1 end in `_refusal_update` | centred |
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| N>1 unit end (probe answered, takes the other way) | centred; uncentred, B's idle -100 W read as "takes 100 W" and ended a charge refusal at once |
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| stale-path refusal (`_refusal_from_stale`, N=1 and N>1) | centred |
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| SAFETY-42 "parked" (small ask, gives nothing) | centred |
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| SAFETY-37 stale gate | unchanged: it grades register changes against command travel, not a level |
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| SAFETY-57 release | unchanged: it reads the command only |
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| SAFETY-30 per-unit sign | unchanged: opposition needs both over 250 W; B's 100 W idle cannot make or hide one alone |
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| SAFETY-42 shortfall | unchanged: B reads ~100 W short at every power, which errs towards reporting (report only) |
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## Bounds
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- Band: `|reading - idle| < 100 W`, `|idle| <= 250 W`.
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- A correct idle reading: a refusing B behaves as a refusing A.
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- A wrong one (worst, 250 W off): a refusing battery reading outside the band
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is not refused by this rule; a frozen register is still caught by the stale
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gate at 35 s of asking. Learning only at a ~0 W command for 2 min keeps a
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wrong value unlikely. Once learned, a 10 min transient moves it by 28 %;
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the first value (a 2 min mean) is the exposed one.
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- An idle reading beyond 250 W is never learned: such a unit keeps 0 W.
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## Catch times (rig, refusing from 200 s after a 400 s rest, +-4 W)
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| refusing | meter 1 s | 2 s | 5 s |
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|---|---|---|---|
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| A, N=1 | 28 s (before 28) | 28 (28) | 65 (65) |
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| A, N=2 | 28 (28) | 28 (28) | 110 (110) |
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| B, N=1 | 28 (never) | 28 (never) | 65 (never) |
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| B, N=2 | 24 (never) | 24 (never) | 60 (never) |
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A at N=2 on a 5 s meter is 110 s here because the rig's grid goes flat once
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A is cut, so the loop cycles on the 15 s floor; the same run on the PR before
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SAFETY-97 gives 110 s. B restored after a restart, refusing from the start:
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24 s; with nothing saved: never.
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## Before -> after
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- Healthy B with its offset, SAFETY-94's four scenarios, N=1 and N=2, 1/2/5 s
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meters, both register shapes, idle learned or restored (96 runs): 0 stale,
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0 refused. Reversals, lag 10/20 s, idle restored: 0.
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- Live replay (SAFETY-94 part 1): 0 trips (the gate is untouched).
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