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If regen can feed 60kW into the battery, why is plug-in charging limited to 10kW/charger? When is regen going through to exceed that charger limitation?
If you had a device to spin the wheels backwards fast enough, you could charge quickly even without a Supercharger
Might have to do with regenerative being DC and home charging is AC.
Correct. AC current must pass through an inverter to be converted to DC, which can then be fed to the battery. (Batteries neither consume nor produce AC power).
It's this inverter hardware that's limited to 10kW each.
Regen, Superchargers, and DC fast chargers all feed DC directly to the battery, which is why the limit can be surpassed.
Thanks!Cool "info graphic".
Well spotted. I was doing this thinking of the 60kWh version, which I thought could reach 100mph.However your max (governed) speed indicator is a bit off. Should point to 125 and/or 130.
Wouldn't the A/C induction motor produce A/C regen?
If you had a device to spin the wheels backwards fast enough, you could charge quickly even without a Supercharger
An inverter is a device that converts DC to AC. A rectifier is a device that converts AC to DC.
The Model S has one or two "chargers" depending on spec. They include rectifiers to convert fixed low frequency mains AC electricity to DC to charge the battery. A supercharger station uses the exact same chargers; it just has about 10 of them inside it (and they're run at higher load than in the car i.e. 12kW each, 120kW total).
The car also has a "drive inverter" which is actually both an inverter and a rectifier; i.e. it can convert DC to AC and also AC to DC. It is a much higher power device (up to 310kW in inverter mode) and has to deal with variable, higher frequency, AC on the motor side.
They're completely different systems with different purposes and tolerances.
Doesn't even have to be backwards: Ad-hoc Fast Charging
Good explanation. One correction: a Supercharger has a stack of 12 of the car chargers inside, currently running at 10kW each. I've seen inside of one and counted. No room for a 13th though, so to get from 120kW to 135kW they'll have to overdrive them slightly to 11kW.