SAFETY-73: a battery that refuses, per inverter, with two or more

SAFETY-52's hold applied per unit at N>1 (owner, 2026-09-27, option R).
A unit that gives < 100 W for 12 cycles in one direction while asked
> 200 W, or trips its stale-reading gate on a ~0 W reading, gets a
P_SAFETY `refused` unit limit closing that direction, so the allocator
hands its share to the others within their own limits. Probe: a +-200 W
pin every 15 min, one unit at a time, only while the site asks 200 W that
way. All units refusing: the site law holds 0 W. Exits reseed the site
target from the wire. INFO plus one WARNING (REFUSES_ABOVE_CUT_OUT) above
the configured cut-out; SAFETY-42/43 no longer report a refusing unit.
N=1 unchanged.

test_refusal_units.py: cases a/b/c on flat and jitter registers against
the old behaviour, probes, recovery, exits; mutations U1-U13 all red.
TEST-19 no-fault campaign: 0 engagements in 5280 runs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

goodwe_controller/app/messages.py

@@ -786,6 +786,14 @@ def row_battery_stuck(unit) -> str:
             f"for now")
 
 
+def row_battery_refuses(unit, sign, probing) -> str:
+    """SAFETY-73. One inverter's battery refuses, the others take its share."""
+    way = "give" if sign > 0 else "take"
+    if probing:
+        return f"{unit}: testing if the battery will {way} power again"
+    return f"{unit}: the battery refuses to {way} power, the others take over"
+
+
 # The top of the page: why the battery does what it does (the "Why" line).
 WHY_WINNER = {
     "loop": "Keeping the grid near zero",
@@ -805,6 +813,8 @@ WHY_WINNER = {
     # SAFETY-52: the loop's two words for a battery that gives nothing.
     "battery refuses": "The battery refuses to give power",
     "battery probe": "Testing if the battery gives power again",
+    # SAFETY-73: a refusing inverter's own claim, closed or probing.
+    "refused": "A battery refuses power, the others take over",
 }
 WHY_LIMIT = {
     "peak(quarter peak)": "the peak limit",
@@ -815,6 +825,7 @@ WHY_LIMIT = {
     "pack": "the battery level",
     "reserve": "the battery reserve",
     "maintenance": "battery maintenance",
+    "refused": "a battery that refuses power",
 }
 
 
@@ -857,6 +868,8 @@ HINTS = {
     "battery_back": "{unit}: battery power reading is used again",
     "battery_refuses": "The battery refuses to give power, the add-on asks 0 W",
     "battery_gives": "The battery refusal ended, control asks for power again",
+    "unit_refuses": "{unit}: the battery refuses power, the others take over",
+    "unit_gives": "{unit}: the battery refusal ended, it is asked for power again",
     "bad_value": "The add-on made an invalid power value, inverters set to 0 W",
     "write_blocked": "{unit}: a power request was blocked, it is set to 0 W",
     "all_blocked": "A power request was blocked, inverters set to 0 W",
@@ -1027,6 +1040,12 @@ def status_samples() -> list:
         ("row_peak_guard_on", AMBER, row_peak_guard_on(1200, 2500,
                                                        shadow=True)),
         ("row_battery_stuck", AMBER, row_battery_stuck("inverter-b")),
+        ("row_battery_refuses", AMBER, row_battery_refuses("inverter-b", 1,
+                                                           False)),
+        ("row_battery_refuses", AMBER, row_battery_refuses("inverter-b", -1,
+                                                           False)),
+        ("row_battery_refuses", AMBER, row_battery_refuses("inverter-b", 1,
+                                                           True)),
         ("row_circulating_check", GREEN, row_circulating_check(0, 0, 60)),
     ]