The Aux power on the generator machines is actually the exciter power [field power] for the welding output.
The SA200 has DC Aux. @ 1.75 KW at best, really old ones have less and really, really, really old ones none at all.
1.75 KW is enough to run 1 common grinder, but the DC limits You to non-electronic tools, and they SHOULD be DC rated.
Yours has 3 KW AC Aux. Not enough to brag about, but enough to run 2 common grinders or 1 of even the most powerfull ones.