mike wrote:

My 27 year old microwave oven was down below 400W output and taking a long
time to heat my coffee.
So, I went out and bought a 1100W one.
Big mistake.
It works fine on coffee, but WAY overcooks small stuff.
Yes, it has a power level setting, but the on-time is 15 seconds
and they modulate the off-time.

Suggestions?

Put in a smaller high voltage capacitor?

Get an oven with inverter power control, like a Panasonic?