The "automatic" method of killing things while using the microwave is interesting, but not sure it's worth the hassle, at least IMHO - A simple DPST mounted beside my microwave kills my converter for however long I need it off. No, it's not automatic, but it IS simple..and cost me $2 for the switch, $2 for some wire, and my own time to install it.
Anything automatic would potentially have issues with timing, as well otherwise there's a big potential that whatever heavy load is coming online (Microwave) wouldn't kill the light load (Converter) in time to prevent a generator overload from happening anyways.
