Panasonic Microwave

What you save in weight is now replaced by lower reliability due to the extra complexity of an inverter instead of a dead-reliable iron core transformer to create the 3.5kV for the magnetron. I could see doing this on an airplane or maybe an RV, but quite frankly, I don't care how much the microwave sitting on my counter at home weighs.

Suspect the reason for the inverter is magnetron power modulation. According to a comment in another thread, Panasonic microwave ovens control the microwave power, rather than just the duty cycle.

If that is true, that would be a welcome change to the current way of reducing the energy transfer to the food by very crudely turning the magnetron on and off with very large time periods. If they could steal a few cycles from a 25kHz inverter, then the instantaneous heating would be effectively reduced versus the current method of smoking the item, then letting it cool for ten seconds, then smoking it again, and letting it cool, . . . .

Do they have for nanowaves also?

"Newer models have inverter power supplies that use pulse-width modulation to provide effectively continuous heating at reduced power, so that foods are heated more evenly at a given power level and can be heated more quickly without being damaged by uneven heating."

https://en.wikipedia.org/wiki/Microwave_oven

I have one of these Panasonic microwave ovens. It is the best one I've ever owned. Indeed instead of duty cycle of seconds on, seconds off, it modulates the power from 100% down to 10%. It has a reheat mode that works supper well. Near as I figure, it times how long it takes to boil the water in the food at full power, then based on this the machine reduces power to 50% for the remainder of heat cycle, with this timing based on how long it took to boil the water initially. Seldom is there cold spots. And it never fries the plastics from overheated oil. I believe it's a 1250 watt unit. It does have a turn table spinner to even the beam power radiation.