"Comcast" wrote:

I just purchased a Tappan 550W microwave that consumes 850W. I
also purchased a Xantrex Xpower 1000W inverter (modified sine wave).
About 20% of the time, when I start the microwave, the light turns on,
the turn table starts to rotate, and just as the magnetron starts up,
the microwave shuts off.snip

I asked SailorSams.com (from which I am buying this model) about this.
He had no definitive answer but did say "The distributor is going to
send the Tappan microwaves to Xantrex, to let Xantrex specify which
of their inverters should be used with which Tappan microwave." If
you are not in a rush, you might want to ask them in a month or two.

- Walt Bilofsky