diff --git a/core/loadpoint.go b/core/loadpoint.go
index e456225e3..712668ceb 100644
--- a/core/loadpoint.go
+++ b/core/loadpoint.go
@@ -1196,10 +1196,11 @@ func (lp *LoadPoint) updateChargeCurrents() {
 	lp.chargeCurrents = nil
 	phaseMeter, ok := lp.chargeMeter.(api.MeterCurrent)
 	if !ok {
-		// guess active phases from power consumption
-		// assumes that chargePower has been updated before
+		// Guess active phases from power consumption. Assumes that chargePower has been
+		// updated before. Discussion in https://github.com/evcc-io/evcc/issues/2146 and
+		// https://github.com/evcc-io/evcc/issues/2177
 		if lp.charging() && lp.chargeCurrent > 0 {
-			phases := int(math.Round(lp.chargePower / Voltage / lp.chargeCurrent))
+			phases := int(math.Ceil(lp.chargePower/Voltage/lp.chargeCurrent - 0.05))
 			if phases >= 1 && phases <= 3 {
 				lp.activePhases = phases
 				lp.log.DEBUG.Printf("detected phases: %dp (%.1fA @ %.0fW)", lp.activePhases, lp.chargeCurrent, lp.chargePower)