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goodwe-addon/goodwe_controller/DECISIONS/SAFETY-118-peak-forecast-unit.md
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SAFETY-118: a missing peak forecast reading keeps the unit-fault state
A missing reading (unavailable, unknown, failed read, non-numeric) no longer
clears the fault: no false 'used again' INFO, no repeated WARNING, the status
row stays. Adds pv.has_reading(). DECISIONS wording fixed; tests added.

Co-Authored-By: Claude <noreply@anthropic.com>
2026-10-16 18:19:44 +02:00

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# SAFETY-118 - the peak forecast is read in its own unit
**Status: for review.** Tests: `test_safety118.py`.
`peak_forecast_entity` was read as a bare number, and anything under 50 was
multiplied by 1000 ("accept kW or W"). A W sensor reading 17 to 45 W, which a
real site did 430 times in one morning, would be taken as 17 to 45 kW. The
validator also called a kW sensor wrong, which was false for this entity.
Decision: the size rule is gone. The entity is read through `pv.watts()`, the
same unit table and reader as the solar entities, so W, kW, MW and the rest
convert by the sensor's own `unit_of_measurement`. No unit, or a unit that is
not power (kWh), means the forecast is not used, exactly as if the option were
empty: the loop cap and every non-forecast peak step still apply. One WARNING
per cause, and a status row and a settings note say the same.
No size rule can be right in both units: 30 W and 30 kW are both ordinary.
The read is still one `GET /api/states/<id>` per cycle, as `hass.number()` made.