I have been charging my electric pickup truck off of an existing standard NEMA 5-15 (120 volt 15 amp) outlet next to our garage for over a year. [And occasionally running a cable out the door from our 240 volt dryer outlet to get a fast charge.]
Finally this summer I had an electrician run a 50 amp 240 volt circuit out to the side of the garage to put in a “real” charging station. Even though the existing Zivan NG3 240 volt charger will only use 12 amps at 240 volts, the NEMA 14-50 outlet gives me lots of room for improvement (240 volts at 40 amps max continuous draw, or 9.6 kilowatts). It also allows anybody with a super big RV to plug right in!
In addition to the NEMA 14-50 outlet, I also ran a GFCI 5-20 (120 volts at 20 amps) off of the same circuit, in case we want to max out 120 volt charging. The entire circuit runs through a sub-meter that easily allows me to read off how many kWh of electricity the truck uses. So far it’s averaging out to about 7-10% of our total monthly electricity usage. (The small plug at the bottom left of the above picture is the original NEMA 5-15 outlet.)