Ok, well I don’t think you will ever get much over 1.3kw on 120v since that is about 11amps.
So if you want more, you MUST be on 240v, and NOT on SLOW.
The charger can draw up to 3.3kw on 240v, so if you cut the voltage in half, you’re cutting the power by a little more than half.
Also, the...