3 phase is very common in the US. Most single family houses don't have it, everything else is likely to have it.
For chargers 3 phase gains nothing. For induction motors 3 phase is useful - but in the modern world even where you have 3 phase you often will run the power through a VFC just so you get control of RPM. For a few other things 3 phase is nice because there is always one phase that isn't near zero to draw power from, but where that matters you can work around it with a few capacitors.
For chargers 3 phase gains nothing. For induction motors 3 phase is useful - but in the modern world even where you have 3 phase you often will run the power through a VFC just so you get control of RPM. For a few other things 3 phase is nice because there is always one phase that isn't near zero to draw power from, but where that matters you can work around it with a few capacitors.