Cottonwood
Roadster#433, Model S#S37
I agree. The probability that two cars will arrive simultaneously, both at very low state of charge, and both connect to the same Supercharger, is low. And even if it does happen, the effect is probably felt for only 10 minutes or so, as the power ramps down once the battery gets to half or so. 67.5 kW is still a pretty impressive power to be charging at.
Interesting thoughts. I will send the supercharger team a recommended fairness algorithm. What do you think about this as a strawman based on arrival time differences?
- 0-1 minute — Equal priority and sharing. If one car can't take 50%, then the other car gets whats left. We don't need rally races to see who can plug in first.
- 1-3 minutes — First to arrive gets 60% or most it can take, whichever is less; second to arrive gets rest.
- 3-5 minutes — First to arrive gets 70% or most it can take, whichever is less; second to arrive gets rest.
- More than 5 minutes — First to arrive gets 80% or most it can take, whichever is less; second to arrive gets rest. I believe this is the current split for first and second to arrive.
Of course we could avoid all hard boundaries and thresholds by the Supercharger cabinet doing a linear ramp in first to arrive priority from 50% to 80% over 5 minutes, or whatever time seems good for fairness... 5 minutes seemed pretty reasonable to me. In that amount of time the first to arrive has already been able to suck in 10 kWh and is on it's way to start tapering.