Will Single Charger Ever Exceed 40 Amps?

Will Single Charger Ever Exceed 40 Amps?

Out of curiosity, I would like to know whether anyone with a single charger Model S has ever seen the car charge at more than 40 amps (NOT with a supercharger). This might occur, for example, if the charging source is only 208V and the maximum charge rate of a single charger is 9.6 kW (9600W/208V=46A). On the other hand, if the charger limit is based on amperage rather than kW, then 40A would probably be the maximum.

nickjhowe | August 28, 2013

WIth the UMC the on-screen current selector seems to max out at 40A, so I think the answer to your question is no.

ir | August 28, 2013

You would need a HPWC, Roadster or high-amp J1772 to know for sure.

dortor | August 28, 2013

40 AMP is the max charge rate for a single charger system @ 240v…

the UMC is also limited to 40 amps…

jat | August 28, 2013

No, it is limited to 40A, and the only way you get the full 10kW power is at 250V, otherwise it will be slightly less.

The limit is both the power and current - the rectifier has a total power dissipation it can handle, and the wiring to it is sized based on the current.

DouglasR | August 28, 2013

@ir - I was actually trying to find out, when using an HPWC or high-amp J1772 where voltage was, say, 208, whether the amperage could exceed 40. Consensus seems to be "no," but I would still like to see it tried.

DouglasR | August 28, 2013

@dortor - the UMC is certainly not limited to 40A. I have used the UMC connected to a Roadster adapter to charge at 70A.

jat | August 28, 2013

@DouglasR - I thought the Roadster adapter connected directly to the Model S, and didn't use the UMC?

Is this what you used?

dortor | August 29, 2013

@DouglasR - I stand corrected - Tesla store folks told me the UMC could only handle 40 AMP…I considered that the facts of the situation - obviously I was wrong (and so were they).

DouglasR | August 29, 2013

Opps. My apologies, dortor. You and jat are correct. I actually own the adapter, and have used it several times, so I don't know where my mind was: the adapter connects the Roadster HPC directly to the car, and does not use the UMC/