[hotrod182]

Need to clarify a few things here.

For a 3.3kWh charger, a 30amp 240v circuit is fine.
For a 6.6kWh charger, you will want to go with at least a 40amp circuit.

Remember to go at least 10% over on the circuit capacity than your load.

Remember, whatever the actual charge is that is going into your battery, figure the charger will be taking about 10% more or so for inefficiency.

110v charging is the worst, You will loose more through inefficiency, as the voltage is having to go from 110v to probably 350-390 volts. They generally draw about 1300 watts or so, with only 1150 watts or so going into your battery. So to charge a 20kWh+ battery, it will literally take close to 20 hrs to charge. So not a very practical solution for most people.

I use the dryer outlet for my 3.3 kWh charger. And if I drive 50 miles in a day, it will still only take about 4 hrs to charge.

Most dryer outlets are good for only 30 amps, so it won't yield the power necessary for 6.6-7.2 kw charging.

Most Central AC circuits are set up for 50 amps though.