Does anyone have a recommendation for a power source-something I can plug the incubator into, and then into the wall that will give me a battery backup. My husband suggested a USB power source but I was looking at them on amazon and couldn't figure out how long they would give me, I'd love to hear from someone who has actually used one. We have a generator but it has to be turned on manually so I need something to bridge the gap in case we aren't home. I just put some hard to come by eggs in the incubator (silkied ameraucana) and am nervous that one bad wind storm could end my project.