kizan971 wrote:Well I was just told on FB that my model S can only handle 16A and anything else is useless. does that mean im stuck with 15 to 20 hr charge times?

I was going to do install a 40A 220-240V but not if its not going to do anything and I went to look at newer models and it doesnt say charging capabilities.

I am simplifying this a bit but if your car is the 3.3 you can charge up to 16 amps at 240 volts. The stock EVSE, sometimes called the portable EVSE or the trickle charger, that plugs in to a standard 120v volt outlet will supply 120 volts at 12 amps or 1440 watts to the car. The most important part here is the watts delivered to the car, both the voltage and amperage play in to those numbers. So now if you can up that, still at 120 volts to 16 amps you are now supplying the car 1920 watts. Now if you can get a 240 volt outlet that can supply 16 amps you can supply the car with 3840 watts.

Another way to think of the voltage of 120 volt vs 240 volt is one hose or two. So if they are both running at 16 amps 240 volts is twice as much as a single 120 volt hose, bad analogy I know, but maybe it helps.

120 volts at 12 amps = 1400 watts

120 volts at 16 amps = 1920 watts

240 volts at 16 amps = 3840 watts

Think of watts is how much power is moving at a time in to the car.

So you can see the 240 volt at 16 amps will charge much faster than 120 volts at 12 amps.