Generator only works if you are HOME.
Mine system is on a UPS for that purpose. a few hours in this temp could and will kill your fish.
We left for vacation on Friday. Power went out 1PM on Sunday . My UPS kicked in automatically so the air pump kept running for about 24 hours. My neighbor came home from work on monday morning and called me so I had to call my work and asked someone to drive a generator to my house.
The UPS is worth every penny, it give you the safe buffer needed so you can react to an outage.
ALSO BIG THANKS TO MY KOI BUDDY (HE KNOWS WHO HE IS

) FOR COMING OVER AND MAKE SURE EVERYTHING WAS OK. I OWE YOU A BIG ONE