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Charging Speed

I have had my Model S for about 6 weeks and I have a 50amp outlet installed in my condo community garage. I have noticed that the rate of charge is only 10 miles/hour. I had the electrician (the one recommended by Tesla) come back and check the output and it metered out at 50. I have charged my car at public stations and it charges at 20-23miles/hour out there. Does anyone have any idea why I only get 10 at my home charger?
Thanx, Judi

After a half hour of charging, is it still charging at 10 miles per hour? Is it charging at 240V and 40A as shown by the car?

I have a 240 V - NEMA 14/50 installed at my house.
I get around 26-30 miles per hour.

At one point I thought I was only getting 8 miles per hour but then noticed I had the charge being shown at KW/H as opposed to Miles/H. Just double check and make sure you have the right setting.

What does the car or the app say for voltage and current? The 10 miles/hour is interesting, but what is needed to answer your question is volts and amps in the car.

The car charges at a slower rate if the plug isn't plugged in all the way- that might be what's happening. You may also have the current set below the max of 40 amps. The reported charging speed is also slow to update- the charging power on the battery charging window on the 17" display is a much more reliable gauge of true charging speed.

Thank you all! I will check out all of the suggestions this evening after work.

On the charging screen you can change the current the car draws. For example, I had a 50 amp plug (which is really only good for 40 amps continuous draw). It was sharing a leg with the dryer and would pop the breaker from time to time. I dialed the power draw down in the car charging screen to 30 amps. Presto! No more problem.

FYI - it would be very difficult for an electrician to determine that your circuit is delivering 50 amps without a suitable load. Voltage is easy. Just measure across the terminals. For Amperage, you need an amp meter around only one of the leads, AND a load at the other end of the circuit that can draw 50 amps. Since you car could not do it, without a load, how did he determine the current?

Regardless, probably the setting in your car, I should think.

Is it possible that you once charged at 110v at that location? That may have been at 10A. And the Tesla 'remembers' locations. I'm sure you have to just change it manually to the 40A.

Also, it may be lying. Watch the total miles, not just the rate. Some reported a discrepancy, tho' not that large.


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