Volts x Watts = Amps, which relates to CHARGING, since you need amps to charge, not watts. I know a few people out here with EV's and they are having a devil of a time charging off standard 110 volts, and even 220 volts needs multiple hours to charge. Superchargers are 400 volts at 250 Amps, a whole lot more than a standard household current. But let's forget about that for a minute, even their 240 volts at 80 amps is more than most households in the US, hence the 240v/50A versions for homeowners. Neck that down some more and you have to lengthen the time out. It's akin to filling a swimming pool with a garden hose compared to a fire hose, which is fine if you have the time.
So all those 50A loads at one time is what I was referring to, not the total watts per year, which isn't really relevant except in sizing solar panels. Which, by the way, we're having solar installed at our house in Arizona, and the cheapest reputable price we could find is $36K for 10,000kWh per year.