40 amp extension for charging?

[Asheville Guy]

40 amp extension for charging? Have a 40 amp extension cord that I want to use for charging my model S. I’m told it should be 50 amp? Does it make a difference. May be a silly question but I would appreciate any suggestions. Thanks.

 

[Rocky_H]

Just put this into a Google search, and it will show you the dozens of threads that are already here on this forum about it:

50A extension cord site:teslamotorsclub.com

And here is why you are hearing 50A. There isn't any 40A outlet type, so any kind of big beefy extension will be for either a 14-50 or 6-50 kind of outlet, so they just don't make "40A" extensions.

 

[brkaus]

Do you have any additional info on your extension cord? Brand? Plug type? Wire gauge? Length?

photos of the plugs and any markings might be helpful.

 

[Asheville Guy]

Sorry I didn’t google first. I see how encyclopedic this forum is! Here is a photo:


D3D806BC-057F-414C-AA52-77A3CD3205FC In model S media.

 

[brkaus]

Sorry I didn’t google first. I see how encyclopedic this forum is! Here is a photo:


D3D806BC-057F-414C-AA52-77A3CD3205FC In model S media.

Not sure why, but the attachment didn’t work.

try the upload image/file at the bottom of the text entry box. May also be a limit for new folks.

 

[Rocky_H]

Sorry I didn’t google first. I see how encyclopedic this forum is!

And it may seem odd, but I find using Google with that site option better and quicker than using the search that is built into this forum's interface.

 

[Lasttoy]

You can get 50amp cord off Ebay. Your circuit breaker should be a 50 amp. Car will only pull 30 from 14.50.

 

[Rocky_H]

*sigh* For some clarification:

Your circuit breaker should be a 50 amp.

It's actually allowed to be either 40A or 50A, depending on what is to be plugged into it. With the 2nd generation UMC, it is a maximum 32A draw, so the 40A circuit would be appropriate and code compliant. On the older 1st generation UMC, it was 40A max, so it did need the 50A breaker.

Car will only pull 30 from 14.50

Regarding the UMCs, I mentioned either the 40A or 32A for the older or newer versions. And with the onboard chargers in the car, that depends on what model of car you have. Since this is a Model S section, probably 40A or 48A max.