Dear all
After we do not get clear answers in the German TFF forum I would like the following question to be discussed in this international forum.
Many new European owners experience severe troubles when charging their Model 3 with three phase ac power. Including me. Power is reduced from the possible 11 kW down to sometimes as little as 2 kW.
I have the following setup: I use a Swiss T15 three phase socket which delivers 10 amps at maximum. I set the car to pull 10 A, and I set my mobile wallbox (Crohm) to 10 A either. The car starts by pulling 7 kW for a few hours and then reduces speed drastically. As I said to 2 kW.
At a 22 kW charging pole the full 11 kW is being sustained.
Suprisingly one phase charging at the same T15 plug does not reduce speed at all.
The Crohm Box is able to show current voltages. When charging is started the three voltages drop from around 227, sometimes 230, to 221 or so volts. In the TTF forum I was told that a drop of of more that 3 percent is outside the norm. 230 to 221 would exceed this. So this would explain the reduced speed at three phases. However, the 221 V is still completely inside the norm of absolute voltages (must be above 210 or 215 V, afaik).
However: If I charge at one phase the voltage drop is the same, but the speed is /not/ reduced.
Oddly things do not change if I set the 3 phase charging speed to 6 amps. Still the speed is reduced.
So I would conclude that three phase charging follows a different algorithm than one phase charging. Which is odd. It looks like the Model 3 is more careful at 3 phase charging than at one phase.
Any explanation for this? Is three phase charging too sensitive to voltage drops? Or is one phase charging not sensitive enough? Any solutions? Do you experience the same problems?
(I am aware that it might be wise to have the lines checked by an electrician anyway because the voltage drop is too high - however, if one phase charging is still acceptable, why is three phase charging not?)
Thank you for your thoughts.
After we do not get clear answers in the German TFF forum I would like the following question to be discussed in this international forum.
Many new European owners experience severe troubles when charging their Model 3 with three phase ac power. Including me. Power is reduced from the possible 11 kW down to sometimes as little as 2 kW.
I have the following setup: I use a Swiss T15 three phase socket which delivers 10 amps at maximum. I set the car to pull 10 A, and I set my mobile wallbox (Crohm) to 10 A either. The car starts by pulling 7 kW for a few hours and then reduces speed drastically. As I said to 2 kW.
At a 22 kW charging pole the full 11 kW is being sustained.
Suprisingly one phase charging at the same T15 plug does not reduce speed at all.
The Crohm Box is able to show current voltages. When charging is started the three voltages drop from around 227, sometimes 230, to 221 or so volts. In the TTF forum I was told that a drop of of more that 3 percent is outside the norm. 230 to 221 would exceed this. So this would explain the reduced speed at three phases. However, the 221 V is still completely inside the norm of absolute voltages (must be above 210 or 215 V, afaik).
However: If I charge at one phase the voltage drop is the same, but the speed is /not/ reduced.
Oddly things do not change if I set the 3 phase charging speed to 6 amps. Still the speed is reduced.
So I would conclude that three phase charging follows a different algorithm than one phase charging. Which is odd. It looks like the Model 3 is more careful at 3 phase charging than at one phase.
Any explanation for this? Is three phase charging too sensitive to voltage drops? Or is one phase charging not sensitive enough? Any solutions? Do you experience the same problems?
(I am aware that it might be wise to have the lines checked by an electrician anyway because the voltage drop is too high - however, if one phase charging is still acceptable, why is three phase charging not?)
Thank you for your thoughts.
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