We need 277 volt AC compatible charging. Really.

Gshenderson

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A 50 A circuit with 40A EVSE should get you 20 miles/hour.
The Rivian included charge cord with the 14-50 plug gets you 16 miles/hour @ 32A, and a 48A EVSE will get you 25 miles/hour. Using a 40A EVSE should land you around 20.
But I think you need a 60 amp breaker for that 48 amp EVSE, correct?
 

DucRider

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But I think you need a 60 amp breaker for that 48 amp EVSE, correct?
Yes, but the question was about plugging into a 14-50 on a 50 Amp breaker. That lets you use a 40A EVSE hence the 20 miles/hr.
A 14-50R could also be installed on a 40A circuit (there is no dedicated NEMA 40A plug/receptacle so using a 50A receptacle is specified by code). That is why the portable EVSEs like Tesla and Rivian provide are designed to draw no more than 32A even though they have a 14-50 plug.
 

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