Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.

Will new battery fuse allow for faster Super Charging?

What limits charging is the power that the cells can accept, not the fuse. (A battery cell can accept less power input than what it is capable of getting out; whereas the fuse does not care which way the current flows.)

A fun calculation : taking the 'old' fuse limit into account and a low pack voltage for the 85kWh battery yields a maximum power through the fuse at 350V * 1300A = 455kW. Clearly, that's not the bottleneck for charging !

[Edit :] As randompersonx said, the 1300A rating is burst, not continuous, so my calculation is moot.
Anyhow, I do not believe the 'old' fuse is what limits supercharging at 120kW, but I do not have any evidence to back this up.
Last edited:


Space Weatherman
Dec 13, 2013
Annapolis, MD
Charging is limited by the parasitic energy dissipated by resistance internal to the cells, which tends to heat them and cause chemical modifications such as plating of the electrodes, if I understand it right. So dissipation in an external switch should not be relevant to the warming of the cells' innards, whereas active cooling of the pack is very relevant. A superconducting battery could presumably be charged at an arbitrary rate.

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.