Loadpoint: fix spurious negative power warning (#13383)

core/loadpoint.go

@@ -666,7 +666,7 @@ func (lp *Loadpoint) syncCharger() error {
 		return fmt.Errorf("charger enabled: %w", err)
 	}
 
-	shouldBeConsistent := lp.chargerUpdateCompleted() && lp.phaseSwitchCompleted()
+	shouldBeConsistent := lp.shouldBeConsistent()
 
 	if shouldBeConsistent {
 		defer func() {
@@ -1297,7 +1297,8 @@ func (lp *Loadpoint) UpdateChargePower() {
 
 		// https://github.com/evcc-io/evcc/issues/2153
 		// https://github.com/evcc-io/evcc/issues/6986
-		if lp.chargePower < -20 {
+		// https://github.com/evcc-io/evcc/issues/13378
+		if lp.chargePower < -100 && lp.shouldBeConsistent() {
 			lp.log.WARN.Printf("charge power must not be negative: %.0f", lp.chargePower)
 		}
 
@@ -1526,6 +1527,10 @@ func (lp *Loadpoint) stopWakeUpTimer() {
 	lp.wakeUpTimer.Stop()
 }
 
+func (lp *Loadpoint) shouldBeConsistent() bool {
+	return lp.chargerUpdateCompleted() && lp.phaseSwitchCompleted()
+}
+
 // chargerUpdateCompleted returns true if enable command should be already processed by the charger (so we can try to sync charger and loadpoint)
 func (lp *Loadpoint) chargerUpdateCompleted() bool {
 	return time.Since(lp.chargerSwitched) > chargerSwitchDuration