diff --git a/powerwall.sh b/powerwall.sh
index 4fe4b84c..8083944a 100755
--- a/powerwall.sh
+++ b/powerwall.sh
@@ -774,7 +774,7 @@ CHECKPOWER(){
 						average=$(AVERAGEPOWER ${PW_POWERSENSOR_ID[${SENSOR}]} ${avgdays}); average_disp="${idsCL[LightYellow]}			`IDS_NUMBER_FORMAT ${average}`'watts"
 						echo -en "\r\033[K"; echo -en "${MSG}${idsCL[LightYellow]}${average_disp}"
 					elif [ "${HOST_WATTS}" != "0" ]; then
-						[ "${PS1}" == "" ] && PS1='0.0' || PS1=`echo "scale=1; ${PS1}/10" | bc`; (( $(bc <<<"${PS1} < 1") )) && [[ "${PS1}" = *"."* ]] && PS1="0${PS1}"
+						[ "${PS1}" == "" ] && PS1='0.0' || ( PS1=`echo "scale=1; ${PS1}/10" | bc`; (( $(bc <<<"${PS1} < 1") )) && [[ "${PS1}" = *"."* ]] && PS1="0${PS1}" )
 						[ "${PS2}" == "" ] && PS2='0.0' || ( PS2=`echo "scale=1; ${PS2}/10" | bc`; (( $(bc <<<"${PS2} < 1") )) && [[ "${PS2}" = *"."* ]] && PS2="0${PS2}" )
 						echo -en "${idsCL[LightCyan]}	[PS1=${PS1}'A, PS2=${PS2}'A]"
 					fi