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[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey Doug,

I would avoid a 110 V VFD/spindle.

@Aiph5u

With 120 V you should be aware that all your wires and fuses will need to be dimensionated for double the current as if you use 240 V.

A VFD with single-phase input made for a 2.2 kW spindle draws about 4.8 kVA max. power. With 240 V this means up to 24 A current, fuse got to be 30 A, VFD wire size at its input got to be 5.3 mm² (~AWG10). If you want to use the same input power (kVA) with 120 V, you got to double all these currents and wire cross-section areas.

I think there is a reason why Omron produces no 100 V class VFDs and Hitachi produces 100 V class VFDs just up to 0.75 kW – because current (and subsequently wire size) would be too high, particularly on single-phase input.

Note that in the U.S., many people have split-phase electricity (two 120 V phases shifted by 180°) which means even if they seem to have only 120 V outlets (which is between one hot and neutral) they usually have 240 V in their homes (between two hots of different phases) so an electrician can easily install a circuit with a 240 V outlet and circuit breaker.