Hey Kenneth,
people seem to buy those nonetheless but these are usually chinese crap. VFDs with only stupid V/f control but no vector control, that’s stone age. The “manufacturers” of such VFDs willingly omit the input current draw on nameplate and on the manual to make you believe that there exist 110 V domestic supply circuits in North America that offer enough current for such a 2.2 kW spindle. But there is none at 110 V. So what happens to people if they nonetheless buy it? Well they will never be able to bring the spindle to its mechanical load limit, because it will blow their fuses long before they draw the rated power. Of course, if you make a few signs for the thanksgiving table, it could very well be that you will not hit the limit. But unlike a Makita hand trim router, a spindle is neither a hand tool, nor is it a machine, but it is a component intended to be the part of a machine. Therefore if you marry a Onefinity CNC machine and a VFD & spindle, it’s you who are the machine builder and therefore responsible to obey to the safety regulations. And that can never be the case if you connect a machine to a too weak supply circuit, or if you use a VFD whose input current rating is willingly omitted and kept secret by the manufacturer.
Look at the serious VFD manufacturers like Hitachi: The only VFDs they offer for 110 V are for 250 W (0.25 kW) spindle and 750 W (0.75 kW) spindle, but nothing bigger at 110 V. The bigger power VFDs are for 220 V or 400 V. That’s because they take into account what your 110 V supply circuits actually can deliver.
110 V is not for machines, it is for electric light and for small electrical appliances like phone chargers or radios. It is not for power motors. But usually in North America, you have 220 V (240 V in fact) anyway because you usually have split-phase electricity. You just need someone who can draw a cable to a NEMA 14 socket from your wall power box and install a circuit breaker fuse (MCB) for it.
With a VFD for a spindle of 1.5 kW rated mechanical power, at 110 V, you need approx. 30 A, but only 15 A max. when using a 220 V VFD/spindle for 1.5 kW. Reducing the current this way (by using a higher voltage) is the PURPOSE of the 220 V supply circuits, for heaters, ovens, air conditioners, table saws, router tables, planing machines, big dust collection systems – and for spindles which are induction motors.
Note that a 80 mm 1.5 kW spindle has more efficiency so delivers more mechanical power than a 65 mm 1.5 kW spindle.
My 220 V VFD for 2.2 kW spindle has a max input rating of 24 A, with 110 V it would be 48 A(!).