Depeche Mode
Member
Yes it is more inefficient and you will use more electricity ($)
If you use the 120 volts charging then, yes, you'll have to use more energy to gather the same amount of energy than if you use a 240 volts...
Just a little check on the «Charger Calculators» and you'll see that difference between them 110/120 volts VS 240 (whatever the amp, not much difference between them)
For the same amount of charge, the 110/120 volts is taking 13,9 kw and would cost 1,66$ when it would cost a 1,27$ (or 10,5 kw) if using the 240 v/24 amp / 1,24$ or 10,3 kw if using a 40 amp charging and same using of energy if using the HPWC...
Tesla Charging | Tesla Motors