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Home charging [issue]

Don65

New Member
Mar 30, 2021
2
3
Surrey
I have a 40 amp 14/50 Nema plug for charging my model 3. When I’m charging it says I’m charging at 8 amps. Shouldn’t it be around the m3 limit of 32 amps?



F983C7A3-7AAE-43E2-8179-B7BB1F177E45.jpeg
 

skygraff

Member
May 15, 2018
233
207
Chicago
Is it possible you set your charge current lower than the charge cable's max amperage? It's supposed to go to the max automatically but be lower if previously set lower. If the screen shows 8 as the max, maybe the breaker or something else isn't performing at rated capacity.

This can only be adjusted on the main screen in the car.

Screen Shot 2021-06-13 at 23.05.50.png
 

joebruin77

Active Member
Dec 23, 2018
1,198
1,100
Encino, CA
Wasn't aware this was possible. Is it advisable to limit the amps if faster charging isn't needed? My wall connector does 48, which in most cases is way faster than I need.

As long as your system is set up to handle 48 amps (proper gauge wire, proper amp breaker, etc) then you can usually charge at 48 amps with no problem and there is no need to reduce your charging rate. However, there is one exception. I would take into consideration the overall power use in your home as well as the size/capacity of your electrical panel. For example, during the summer when I am running the AC, I usually charge at a lower rate just to make sure I am not over taxing my house electrical system.

I found this calculator recommended on another Tesla forum to do a rough estimate calculation of the load on your particular system to help determine if you can safely charge at 48 amps:

 
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Don65

New Member
Mar 30, 2021
2
3
Surrey
Is it possible you set your charge current lower than the charge cable's max amperage? It's supposed to go to the max automatically but be lower if previously set lower. If the screen shows 8 as the max, maybe the breaker or something else isn't performing at rated capacity.

This can only be adjusted on the main screen in the car.

View attachment 673193

Thank you skygraff I checked screen and it would only allow 8A but then I got a warning that wall plug was not all the way in. Sure enough it had come partially out, so I pushed it in and now able to set it to 32A.
 
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Rocky_H

Well-Known Member
Feb 19, 2015
7,277
8,961
Boise, ID
Yeah, if the plug type you want is sold by Tesla, you just buy it from Tesla. EVSEAdapters is great, but what they are doing is just buying official ones and taking them apart to change the plug type to ones Tesla doesn't sell, so that's why they are going to cost a little more.
 

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