Oh wow, so sorry to hear that. The consumption of the octagon was the reason I decided not to get one, also the over complexity of it. My unit would not work for it but, have you thought of a 300w power inverter run direct from a fully charged battery.
Before making my device for my incubator, this is exactly what I did. It was just after 2AM and my young son woke me saying he was scared as it was all dark, I nearly pooped a brick as knowing my eggs ( 12 of them all duck ) had about 2 weeks to go. I dressed, grabbed some tools, battery off car, and incubator running again.
Damage was already done, only one made it to pippin but died in the shell.
The shear extra power needed by the inverter itself took enough power to run 2 incubators so the battery had to be manually monitored throughout the night to make sure it was ok. It barely had enough power to work by the time the mains returned.
It is why I went for the polystyrene type incubator, very very low power. I also wanted to do away with the power greedy inverter which, in the end is why I made my own unit.
You could maybe have a polystyrene incubator as a backup, with a battery fully charged to hand at the ready, its a bit of a plug but maybe if you did that then my monitor would do the job as and when needed without any interaction.
Tell you what, if you buy a polystyrene incubator then pm me, will help you out, ok.
Donny