If you can plug your car into a standard 120v 15a outlet that will give you about 35-45 miles of range overnight. Unless you have a really long commute, that's probably enough on average, and if you have a week where you're driving more you can supplement your charging by going by a public fast-charger. 240v 15a gives you twice as much charging and probably doesn't require very expensive electrical upgrades, just finding a circuit you can dedicate to the car and swapping the breaker+outlet.