diff --git a/.claude/skills/lib/grid-cal-monitor b/.claude/skills/lib/grid-cal-monitor
index 2e8046f..c118018 100755
--- a/.claude/skills/lib/grid-cal-monitor
+++ b/.claude/skills/lib/grid-cal-monitor
@@ -35,13 +35,29 @@ try:
 except:print("")'; }
 P(){ echo "sensor.eg4_lifepower4_lifepower4_${1}_lifepower4_${1}_${2}"; }
 pub(){ mosquitto_pub -h "$BHOST" -p "$BPORT" -u "$BUSER" -P "$BPASS" -t "solar/control/lvx6048/$1" -m "$2"; }
+raw(){ for u in 1 2; do mosquitto_pub -h "$BHOST" -p "$BPORT" -u "$BUSER" -P "$BPASS" -t "powermon/lvx6048_${u}/addcommand" -m "$1"; done; }
 
+# revert VERIFIES it actually took (the friendly path can silently fail — lvx-control
+# used to encode POP01 which the inverter rejects, and powermon's adhoc queue can wedge).
+# Ground truth = behavior: in SBU with a full bank, line_power_direction leaves 'input'.
+reverted_ok(){
+  local ld pop; ld=$(st sensor.lvx6048_lvx6048_1_line_power_direction)
+  pop=$(st sensor.lvx6048_lvx6048_1_output_source_priority)
+  { [ -n "$ld" ] && [ "$ld" != "input" ]; } || echo "$pop" | grep -q "Battery - Utility"
+}
 revert(){
   [ "$REVERTED" = 1 ] && return 0
   log "REVERT: output_priority->solar_battery_utility, charger_priority->solar_first"
-  pub output_priority solar_battery_utility; sleep 3
-  pub charger_priority solar_first; sleep 8
-  log "REVERT done. live POP=$(st sensor.lvx6048_lvx6048_1_output_source_priority)/$(st sensor.lvx6048_lvx6048_2_output_source_priority) PCP=$(st sensor.lvx6048_lvx6048_1_charger_source_priority)/$(st sensor.lvx6048_lvx6048_2_charger_source_priority)"
+  pub output_priority solar_battery_utility; sleep 3; pub charger_priority solar_first; sleep 12
+  if reverted_ok; then log "REVERT verified (line_dir=$(st sensor.lvx6048_lvx6048_1_line_power_direction))"; REVERTED=1; return 0; fi
+  # escalate: powermon adhoc may be wedged and/or friendly encode rejected -> restart + raw
+  for try in 1 2; do
+    log "REVERT not effective yet — restart powermon + raw POP1/PCP0,0 (try $try)"
+    sudo systemctl restart powermon.service powermon2.service 2>/dev/null; sleep 12
+    raw POP1; sleep 3; raw PCP0,0; sleep 15
+    if reverted_ok; then log "REVERT verified after escalation"; REVERTED=1; return 0; fi
+  done
+  log "REVERT: !!! COULD NOT CONFIRM — still grid-priority. Manually run: raw POP1 to both addcommand topics (POP1, not POP01)."
   REVERTED=1
 }
 trap 'revert; log "exit"' EXIT INT TERM
diff --git a/LVX6048/lvx-control/lvx-control b/LVX6048/lvx-control/lvx-control
index d4e7fe1..3c0efd1 100755
--- a/LVX6048/lvx-control/lvx-control
+++ b/LVX6048/lvx-control/lvx-control
@@ -44,7 +44,7 @@ ADHOC_TOPICS = (
 # Intentionally a strict subset of flash.py's SCHEDULE — only the safe,
 # day-to-day knobs. The risky-end calibration setters live in flash.py.
 
-POP_MAP = {"solar_utility_battery": "0", "solar_battery_utility": "01"}
+POP_MAP = {"solar_utility_battery": "0", "solar_battery_utility": "1"}  # PI18 POP is single-digit; "01" is malformed -> inverter silently rejects (confirmed 2026-06-25, broke a calibration auto-revert)
 PCP_MAP = {"solar_first": "0", "solar_and_utility": "1", "solar_only": "2"}
 PSP_MAP = {"battery_load_utility_ac": "0", "load_battery_utility": "1"}
 ALLOWED_MCHGC = (10, 20, 30, 40, 50, 60, 70, 80)
diff --git a/LVX6048/lvx-flash/flash.py b/LVX6048/lvx-flash/flash.py
index ea26f74..587e331 100755
--- a/LVX6048/lvx-flash/flash.py
+++ b/LVX6048/lvx-flash/flash.py
@@ -79,7 +79,7 @@ KEY_DOCS: dict[str, str] = {
     "grid_tie":                     "enum: enabled | disabled (PEI/PDI)",
 }
 
-POP_MAP = {"solar_utility_battery": "0", "solar_battery_utility": "01"}
+POP_MAP = {"solar_utility_battery": "0", "solar_battery_utility": "1"}  # PI18 POP is single-digit; "01" is malformed -> inverter silently rejects (confirmed 2026-06-25)
 PCP_MAP = {"solar_first": "0", "solar_and_utility": "1", "solar_only": "2"}
 PSP_MAP = {"battery_load_utility_ac": "0", "load_battery_utility": "1"}
 PBT_MAP = {"AGM": "0", "FLOODED": "1", "USER": "2"}