diff --git a/powerwall.sh b/powerwall.sh
index a8f3b934..fdc0e555 100755
--- a/powerwall.sh
+++ b/powerwall.sh
@@ -120,7 +120,7 @@ CHECKACV_SERVICE(){
 		[ $volt_diff -lt 0 ] && volt_diff=$(($volt_diff * -1))
 		if [ ${INPUTACV%.*} -ge ${min_volt} ]; then
 			echo "($datetime) normal voltage: ${INPUTACV}V"
-			if [ $volt_diff -gt 1 ]; then
+			if [ $last_volt -lt ${min_volt} ]; then
 				echo -e "($datetime) Normal voltage detected\nVOLTAGE: ${INPUTACV}V" | mail -s "POWER NOMINAL AGAIN" $email_alert
 			elif [ "$last_volt" = "0" ]; then
 				echo -e "($datetime) Normal voltage detected\nVOLTAGE: ${INPUTACV}V" | mail -s "Power Nominal" $email_alert