diff --git a/offsite-power-check.sh b/offsite-power-check.sh
index 1c4eb165..1d5acdcc 100755
--- a/offsite-power-check.sh
+++ b/offsite-power-check.sh
@@ -10,11 +10,11 @@ PW_TMPFOLDER=${PW_FOLDER}/.tmp
 
 . /opt/idssys/powerwall/settings.conf
 
-SHUTDOWNSERVERS_AT_LOAD=80	#percent
-WAIT_TO_POWER_SERVERS=5		#minutes
-LOG_INTERVAL_NORMAL=60		#minutes
-LOG_INTERVAL_ABNORMAL=30	#seconds
-LOG_INTERVAL_CHARGING=120	#seconds
+[ "${SHUTDOWNSERVERS_AT_LOAD}" == "" ] && SHUTDOWNSERVERS_AT_LOAD=80	#percent
+[ "${WAIT_TO_POWER_SERVERS}" == "" ] && WAIT_TO_POWER_SERVERS=5			#minutes
+[ "${LOG_INTERVAL_NORMAL}" == "" ] && LOG_INTERVAL_NORMAL=60			#minutes
+[ "${LOG_INTERVAL_ABNORMAL}" == "" ] && LOG_INTERVAL_ABNORMAL=30		#seconds
+[ "${LOG_INTERVAL_CHARGING}" == "" ] && LOG_INTERVAL_CHARGING=120		#seconds
 
 # TEST=true  #full
 if [ "$TEST" != "" ]; then