FYI: Tesla Cybertruck Lead Engineer Highlights Risks of Using Supercharger Extension Cords
Tesla Cybertruck lead engineer Wes Morrill has issued an important advisory concerning the use of extension cords at Supercharger stations. According to Morrill, employing North American Charging Standard (NACS) extension cords could potentially compromise safety.
The Risks of Using Extension Cords
Morrill’s warning was a response to an electric vehicle enthusiast discussing an aftermarket NACS DC extension cord. The idea was to enable non-Tesla vehicles like Rivian’s R1T and R1S to utilize Tesla’s Supercharger Network without occupying multiple charging spaces. However, Morrill strongly advises against this practice.
The lead engineer emphasized that utilizing extension cords at Superchargers or other DC charging stations is suboptimal. Morrill has observed numerous cases where these cords led to cable overheating and subsequent safety issues.
“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 +/-,” Morrill shared on social media.
Safety Mechanisms Compromised
Tesla Superchargers feature temperature sensors within the handle, which regulate charging based on temperature readings to prevent overheating. Extending the cable length eradicates this safety measure. Morrill added, “There’s a temperature measurement in the handle and the Supercharger derates based on that temperature. With the extension cable, that safety goes away, adding an additional junction which generates heat, worsening the situation."
Designed for Safety and Reliability
While the convenience of extension cords may be appealing, it’s critical to remember that every component of a Supercharger—including cable length—is meticulously designed for both reliability and safety. Altering the Supercharger’s cable length with extension cords could introduce significant safety risks, including overheating and short circuits.
Tesla has a storied history of prioritizing safety across its vehicles and charging infrastructure. The company has previously cautioned against various popular charging practices that could compromise safety. For instance, earlier this year, Tesla warned that using a wet towel on a NACS handle to increase charge speed could elevate the risk of overheating.
Conclusion: Adhering to Safety Guidelines
Electric vehicle ownership often comes with the temptation to explore aftermarket solutions to improve convenience. However, when it comes to something as critical as charging, adhering to manufacturer guidelines ensures both your safety and the longevity of your vehicle.
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William Kouch, Editor of Automotive.fyi
