The lower of the power delivered by the wall plug and the power consumed by the charger will dictate how quickly the bike can be charged. For example, the Enertia I believe has around an 800w (or 1000w?) charger, which is delivered power to the battery. Chargers are typically 85% efficient, so the 800w rated charge power consumes around 940w from the wall. As long as the charger can accept your wall plug's voltage and frequency then it doesn't much matter if it is a 220v or 110v plug, it is the total power that matters.
Ex on 110v, a 800w rated charger would consume around 9 amps. On 220v the charger would consume around 4.5 amps. Either voltage would be fine if the plugs are rated for 15 amps.
The Empulse charger will be interesting, it can charge at up to 3 kw (3.5kw at the wall). That's significantly more than a 110v 15a plug can supply.. a 220v 15a or 30a plug should cut charge times roughly in half from 110v.