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Wall connector charges at 22kWh but Tesla only gets 7 kWh??

Dario_75D

Member
Feb 16, 2018
127
86
Belgium
Guys, I need your help in understanding if something is wrong with my Wall Connector at home.
I recently upgraded to three-phase and so I asked my electrician to also recable the Wall Connector to make use of the increased power.
Before recabling I was getting 7 kW. In the MCU Tesla showed 7kW and I could also see that the actual consumption in 1h was 7kWh. Also the car was getting 7kWh after 1h charging. So all good.

After the recabling, I see that Tesla and Teslafi are showing that the charge is being performed at 22kW but in practise only 7kW are hitting the car. So after 1h the car only gets 7kWh....

What could be wrong? I was expecting the car getting 22kWh or so after 1h charging at 22kW.

Attached the Teslafi charging report and what the Tesla app shows.

tesla.png
Screenshot 2020-05-23 at 13.39.44.png
 

jjrandorin

Moderator, Model 3, Tesla Energy Forums
Nov 28, 2018
10,854
12,581
Riverside Co. CA
Guys, I need your help in understanding if something is wrong with my Wall Connector at home.
I recently upgraded to three-phase and so I asked my electrician to also recable the Wall Connector to make use of the increased power.
Before recabling I was getting 7 kW. In the MCU Tesla showed 7kW and I could also see that the actual consumption in 1h was 7kWh. Also the car was getting 7kWh after 1h charging. So all good.

After the recabling, I see that Tesla and Teslafi are showing that the charge is being performed at 22kW but in practise only 7kW are hitting the car. So after 1h the car only gets 7kWh....

What could be wrong? I was expecting the car getting 22kWh or so after 1h charging at 22kW.

Attached the Teslafi charging report and what the Tesla app shows.

View attachment 544058 View attachment 544059

I suggest you "report" your own post and ask the mods to move it to model s forum. There are people who have model S' in this section of the forum, but you are ask a question specifically about model S charging speeds, which are not relevant to model 3 charging speeds. Model S owners might be able to assist you better.
 
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Reactions: Rocky_H

smatthew

Active Member
Jun 9, 2018
1,292
2,237
CA Bay Area
Are you sure? I can definitely charge at 16kW at work.
Sorry, thought you had a 3. And 7ish kw fits perfectly for the Standard Range Model 3.

A quick first step would be to call Tesla and ask them to look at the charging logs.

Otherwise, I suspect something is setup wrong in the charger.

Are wires connected to L1, L2, N, and G?
Or L1, L2, L3, N and G?
If you measure from phase 1 to phase 2 do you get 230v or 400 volts. I bet you get 230v. If so, here's your answer.
When you had single phase service the wires were connected to L1, N and G. I bet the electrician added phase 2 -> L2, and phase 3 -> L3. But actually Neutral should be disconnected, and phase 3 connected to N. Check the installation manual.
 
Last edited:

Dario_75D

Member
Feb 16, 2018
127
86
Belgium
Sorry, thought you had a 3. And 7ish kw fits perfectly for the Standard Range Model 3.

A quick first step would be to call Tesla and ask them to look at the charging logs.

Otherwise, I suspect something is setup wrong in the charger.

Are wires connected to L1, L2, N, and G?
Or L1, L2, L3, N and G?
If you measure from phase 1 to phase 2 do you get 230v or 400 volts. I bet you get 230v. If so, here's your answer.
When you had single phase service the wires were connected to L1, N and G. I bet the electrician added phase 2 -> L2, and phase 3 -> L3. But actually Neutral should be disconnected, and phase 3 connected to N. Check the installation manual.

Thanks for your answer. I have 3x230V without neutral.
Find hereunder the wiring pictures. Do you see anything that can be corrected to increase the charging rate?
 

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smatthew

Active Member
Jun 9, 2018
1,292
2,237
CA Bay Area
Everything checks out. It appears your electrician re-used your Neutral wire as phase 3, but that's only a problem in the labeling sense. Call Tesla and have them pull your logs.
 

Dario_75D

Member
Feb 16, 2018
127
86
Belgium
Everything checks out. It appears your electrician re-used your Neutral wire as phase 3, but that's only a problem in the labeling sense.

That seems to be what Tesla advises to do (see excerpt from the manual).
I'll call Tesla on Monday (it's already Saturday night in here).
Where do you think the hiccup is? Anything wrong done by my electrician?
 

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ucmndd

Well-Known Member
Mar 10, 2016
7,037
13,825
California
Something goofy there. Seems you’re only getting 32A on a single phase.

Furthermore if we’re talking about the car in your sig I’m 99% certain you can’t charge at 22kw - my understanding is your onboard charger will max out at 24a x 3 (~16kw)

I’m actually curious if backing the amps off to 24 manually will cause it to use the full 3 phases and charge faster.
 

ucmndd

Well-Known Member
Mar 10, 2016
7,037
13,825
California
Seeing you’re in Belgium - it’s my understanding that the 230v 3-phase no neutral service you describe is generally provided via an “IT” earthing scheme - if that’s the case, DIP switch 1 should be in the UP position per the 3-phase wall connector manual. It’s DOWN in your pictures.

This is pure speculation on my part from half a world away - so please consider this advice to be worth what you paid for it and either consult a professional or proceed at your own risk.
 

Dario_75D

Member
Feb 16, 2018
127
86
Belgium
Seeing you’re in Belgium - it’s my understanding that the 230v 3-phase no neutral service you describe is generally provided via an “IT” earthing scheme - if that’s the case, DIP switch 1 should be in the UP position per the 3-phase wall connector manual. It’s DOWN in your pictures.

This is pure speculation on my part from half a world away - so please consider this advice to be worth what you paid for it and either consult a professional or proceed at your own risk.


Hi, sure thanks for your answers (yes it's a duplicate thread, I wrongly chose model 3 and asked to move it - no answer for a while so I opened a new one).
Yes, it’s the car in the signature. it seems that in Belgium the earthing scheme is TT, so I wouldn’t change that.
On the other hand when you say “backing the amps to 24A” you mean to set the rotary to 7 (25A)?

If I lower the amp on the MCU the charging rate decreases proportionally (see attached picture from Teslafi) and it goes down to 6 kWh and less.

Screenshot 2020-05-24 at 08.31.34.png
 

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