Actually, the i3 can pull enough current to use 7400W. So, it depends on the voltage level involved how many amps that is...it's not amps limited, it's power. My 30A EVSE can see 248vac input, which equates to just over 7400W. If you were on commercial 208vac, the same 30A EVSE would only provide 6240W. So, to determine how long it will take to recharge, you need to know more than just the amps available. The car won't try to pull more amps than the EVSE signals it has, but with an EVSE, the amount of actual power transferred is the product of the amps and the voltage...not all results will be the same. My summertime voltage input tends to be closer to 240vac and won't max out my car's abilities. Some places may only see closer to 220vac if they are at a far end of a transmission line or there's a brownout situation.