Common N. American voltages that I've seen:
120v- can sometimes drop down a bit but the term 110v is really outdated AFAIK.
208v-Commercial 3 phase 240v, can drop down close to 200v. Uses (2) 120v commercial legs.
220v-like 110v it's an outdated term AFAIK.
240v-generally residential power using (2) 120v legs.
277v-commercial 3 phase power using just 1 hot, not really used for EVs except some Teslas.
480v-commercial 3 phase power using (2) 277v legs, probably only used for QC DC stations but in this case they'd probably use all (3) 277v hots.
I believe some locations use lesser voltages than 480v for internal power and in that case I don't know if they use less than 277v/hot, I've only seen 277/480v in my line of work, I'm sure true electricians have see more types than me.
And AFA the whole KW and kWh, I'm personally one that gets confused on it frequently and often refer to old posts to get it right, same as the spelling for their, there, they're, I've been told many times what is correct and even looked it up but for some reason it's really hard for me to get it correct
but I try