[email protected] gives, IIRC, the best charging efficiency, which requires a 30A circuit.

But in terms of practicality it comes down to the miles you need, electricity prices and climate.

If you have a flat rate at reasonable price then you can plug in and charge any time.

[email protected] charging is 1.44kW. If we're conservative and say 80% efficiency, that's 1.152kW to the battery. If we're again conservative and say just 3mi/kWh that's 3.456mph.

Let's be conservative again and say that your car is plugged in 7pm to 7am weekdays, to 10am Saturday morning and 12 hours on Sunday.

That's 7 + 5 * 12 + 3 + 12 = 82 hours of charging.

82 * 3.456 = 283.92 mpw (miles per week)

283.92 mpw * (365.25dpy/7dpw) = 14814.54 miles per year, which is a pretty good amount.

Of course, that charging is miles per week, and not all weeks are the same, so you'll need to use public chargers, but as long as your _typical_ week falls comfortably within your weekly charging limit it can work.

Also, when it comes to 120V charging, the battery buffer is a significant factor. There is an irony that the larger buffer of long-range electrics makes them _more_ practical to charge on 120V or other relatively low power.

For example, If you can get 45 miles of charging every weekday night, and 90 miles each day of the weekend and you commute 80 miles per day, your battery will lose 35 miles of charge per weekday, so you'd need a buffer of at least 175 miles for your working week. In mild climates this could be done solely using home charging with a long-range electric, but not with a short-range electric.