Car charging less than max amps at home?

[Mikey3LR]

Hi everyone! Had my model 3 for a few weeks now and it has started to get colder here in the UK. I noticed the past couple of nights the car has not been charging at 30 amps? It is currently pulling 19/30 (5kwh). On the app you can knock it back up, but I wondered if this was the car doing it on purpose to improve battery health etc, or its just some default setting somewhere thats been set in error as im sure it used to always charge 30/30 until it hit the limit.

For reference i have been keeping it around 50% SoC because dont drive much.

Thanks in advance!

 

[jjrandorin]

People have reported some "strangeness" with changing the amps setting in the Tesla app. Go to the car and bump it back up to the max. This would not be the car setting it like that for battery health or anything... all home charging is considered slow charging as far as the car is concerned.

 

[jrweiss98020]

Yes, mine started dropping to 38 or 39A from 40, after I updated the app to v4.x. It does it less often now, after changing it back to 40 on the car display screen.

 

[Mikey3LR]

Thanks for the help both! I fully expected that to be the case that something had gone a little bit strange… will adjust it on the car.

 

[Braumin]

I had the same problem. Would always set to 23/24 when I checked in the app. I changed it in the car to 24 and it's been fine ever since.

 

[zef3215]

I use a public three phase AC charging near my house 11kW. I noticed quite often lately that the max. amps are somehow set to 15A (10kW) instead of 16A in the phone App and the same in the car.
The car is still on 2021.40.6 software version and Tesla APP is on 4.4.0-810 on iOS.
This sounds to me like a bug in the software or the car limiting the amperage in case is noticing voltage fluctuations to protect the installation. This is how UMC will adjust the amperage when charging from “doggie” 220V socket.
Something to be observed if is changing with new car software updates?

What software version are you on?

 

[Mikey3LR]

Yep also on 2021.40.6 And 810 ios mobile app! I set the charge to max in the car today and increased limit to 60% so it would have a bit of time to run at that speed. Will monitor! Was hard to google…

 

[jankratochvil]

I use a public three phase AC charging near my house 11kW. I noticed quite often lately that the max. amps are somehow set to 15A (10kW) instead of 16A in the phone App and the same in the car.

I expect owners of the AC charger did set the maximum amperage to 3x15A. I have already seen such setup. There are some electric tables for diameter of the used cables, its placement, temperature etc. and it could tell them 15A is the maximum permitted limit: (sorry it is in Czech) calculator | tables

 

[zef3215]

I expect owners of the AC charger did set the maximum amperage to 3x15A. I have already seen such setup. There are some electric tables for diameter of the used cables, its placement, temperature etc. and it could tell them 15A is the maximum permitted limit: (sorry it is in Czech) calculator | tables

I used the same charger before and never had this issue. Anyway, in the meantime I got few updates and the “problem” is gone.