Would recommend AGAINST using an extension cord on a supercharger (or any DC charging station with a liquid cooled cable). Have seen multiple instances of the cable overheated and shorting DC +/-.
There's a temperature measurement in the handle and the supercharger derates based on that temperature. With the extension cable that safety goes away. On top of adding an additional junction which generates heat making matters worse.
While the use of extension cords for Tesla Superchargers may seem convenient, drivers should keep in mind that each aspect of a Supercharger is built by design.
Effectively modifying the length of a Supercharger cable through an extension cord may then present some safety risks.
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