FlatSix911
Porsche 918 Hybrid
Electrek addressed this issue with Tesla throttling charging over 2 years ago...
Tesla explains why it limits Supercharging speed after high numbers of DC charges
The issue came back into focus this week after a Tesla owner returned from a road trip where he used several different Superchargers and couldn’t get a charge rate above 90 kW even though the top charge rate is officially 120 kW. He went to the Tesla Service Center and posted the technician’s conclusion to the Tesla Motors Club:
Supercharger General Diagnosis Conclusion: No Trouble Found. Review vehicle logs and verify charging is topping out a lower rate than observed on earlier DC charging sessions. According to Tesla engineers, once vehicle has been DC fast charged over a specified amount, the battery management system restricts DC charging to prevent degradation of the battery pack. According to Tesla engineers, this vehicle has seen significant DC fast charging and is now has permanently restricted DC charging speeds. Important to note, supercharging will always still be available to the vehicle and the battery pack has not yet experienced significant degradation due to the amount of DC fast charging performed on the pack up until this point in time. Vehicle is operating as designed.
Tesla explains why it limits Supercharging speed after high numbers of DC charges
The issue came back into focus this week after a Tesla owner returned from a road trip where he used several different Superchargers and couldn’t get a charge rate above 90 kW even though the top charge rate is officially 120 kW. He went to the Tesla Service Center and posted the technician’s conclusion to the Tesla Motors Club:
Supercharger General Diagnosis Conclusion: No Trouble Found. Review vehicle logs and verify charging is topping out a lower rate than observed on earlier DC charging sessions. According to Tesla engineers, once vehicle has been DC fast charged over a specified amount, the battery management system restricts DC charging to prevent degradation of the battery pack. According to Tesla engineers, this vehicle has seen significant DC fast charging and is now has permanently restricted DC charging speeds. Important to note, supercharging will always still be available to the vehicle and the battery pack has not yet experienced significant degradation due to the amount of DC fast charging performed on the pack up until this point in time. Vehicle is operating as designed.