how to back up incubator thermostat?

[Darkbird]

Very few generators provide a smooth enough sine wave for a proportional t-stat like a Herpstat. Honda makes about the only generator with a smooth power invertor that will do the job, unless you want to install a $5000 automatic backup system for your entire shop.

Not trying to start an argument here, but there are a lot more options than just Honda, unless a herpstat is even more sensitive than a computer power supply. I'm aware of the issues with trying to use non inverter type generators with the herpstats, but I thought any generator capable of producing clean enough power for a computer would be OK with a herpstat.Back to the OPs issue, never heard of that happening before, and I wouldn't use that stat on eggs again. I don't own any of the VE stats, but I have most other brands, and they all just go back to the set temps after a power failure. Not sure of the best solution hers, outside of using two stats in-line.