Not sure if this is the sort of answer you're looking for, but I have a generator (Honda EU3000i) that runs most of our house through a transfer panel. It is not auto start so I have to be home to start it and flip the breakers, but as long as I have fuel for it my reptiles will be ok.
A portable power station might be an option for limited circumstances (small number of snakes, power outage for a limited time, ambient temps staying sort of reasonable and/or enclosures that holds heat properly -- so probably not fish tank cages). I have a Jackery Explorer 1000 and really like it.
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