Great question — answering as the UphillTech team:
Do nothing. The induction stove is most likely insensitive to blackouts (other than it will obviously stop working). It is as well 99% likely to be completely insensitive to any brownout conditions (the performance may degrade all the way to zero). Frequency variations from a generator are not an issue either. Nothing inside depends much on the frequency (within reasonable limits, e.g. 40-100Hz are ok). The only thing it can be reasonably protected against is overvoltage/surge events. Devices that protect against overvoltages and surges pretty much do exist, the problem is that the places where the grid is unreliable tend to host unreliable retail markets as well. Most of these protection...
Full answer by fraxinus: https://diy.stackexchange.com/a/332193 (CC BY-SA 4.0).
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