BFL13,
All I know is that there are more than a few folks who had Mac Laptops where the magic blue smoke came out when used on msw inverters
Here is a report where they got lucky and didn't fry their mac.
AC output voltage: 115 V
Max Continuous AC power: 320 W
AC Output frequency: 60 ±1 Hz
AC Output waveform wave: Modified Sine Wave
I can plug my little iPhone adapter in the inverter AC outlet and it charges.
When I plug my MacBook's adapter, I hear little ticks from the adapter, and nothing happens. I unplug it from the inverter, plug it in the wall outlet, and nothing happens. I have to unplug it from the wall, wait a minute or two, re-plug it to the wall and my MacBook is charging again.
