It seems to work fine. And they're 2200s.
If you need some data, the voltage with a/c running on 2 2200s is 122. With the a/c and micro running with the same 2, the voltage is 116, and the surge is noticeable as they spool up to start the micro.
With all 3 gens running, the voltage with both a/c and MW is 118, and there's little if any surge dip.