Here is a link to my 12 volt incubator. In an outtage, all I have to do is take it out to the car and plug it in.. If a person wanted to, they could use a battery tender type charger, and run the incubator off of a battery all the time, and the tender would recharge the battery as it uses it.. then if the power goes out, the batt should be close to full, and last several hours,... maybe even a day or so... :
https://www.backyardchickens.com/forum/viewtopic.php?id=222189
Jason
https://www.backyardchickens.com/forum/viewtopic.php?id=222189
Jason