I am searching for a small microwave that can run on a Honda EU1000I or the equivalent Yamaha EF1000IS generator so basically 900 Watts or less. So first of all the microwaves labeled on the box 70...
Panasonic makes a full size "inverter" microwave that actually reduces power consumption at the selected lower power options. I think it goes down to 600 watts input before it cycles the magnetron for even lower settings. Most microwaves just draw full power and cycle the magnetron at the "lower" power levels.
When you have utility power you can run at the high power levels.