Quote Originally Posted by mactec54 View Post
How did you figure out that there is a difference in amps, look at the input current ( amps ) requirement not the output, the input requirement will be roughly double the output current ( Amps ) required

No the GT is to big for a 2.2Kw spindle and there would be no benefit as auto tuning will not work for a spindle motor that is smaller than it's rated size, so the 3Kw is the ideal size for your 2.2Kw spindle
From the seller's webpage, can't find a manual, the Output current is 13 amps. So this thing is going to draw roughly 26 amps?