Ok, thanks guys. That's what it sounded like in the OP, but I couldn't picture how they'd bypass the onboard chargers.
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I am not sure if Tesla's supercharger works the same way, but from what I know about CHAdeMO+LEAF, the on-board AC charger still has some logic circuits involved when doing high speed DC charging. Basically the charger in the car has access to sensors, history and knowledge of the battery pack to be able to make intelligent decisions about what volts&s can go into the pack. Even though the off-board DC charger gets to send power directly into the pack it still depends on the car to tell it what sort of charging protocol is appropriate.
AC charging is just power+pilot signal to the car, but DC charging has a lot more cooperative handshaking between car and off-board charger.
AC charging is just power+pilot signal to the car, but DC charging has a lot more cooperative handshaking between car and off-board charger.
stopcrazypp
Well-Known Member
I think that is the ideal offboard charger design (most flexible). The "brain" is in the car and decides what voltage and current goes into the battery (as it does with the onboard charger). All the offboard charger has to do is know how to listen to those commands from the car and doesn't have to make any assumptions about the battery inside the car.
I don't know if Tesla's design is like this though. Since the "supercharger" is only for the Model S right now, they could also have the charging logic being handled by the offboard charger instead. That makes the chargers much less flexible though.
Yes, for instance if it was designed with the assumption that it would always charge a Model S battery pack it could end up being incapable of being adapted to charge other vehicles (like a LEAF) through CHAdeMO. Lets hope it is flexible and open enough that eventually there can be adapters to/from other types of vehicles that support different flavors of QC.
Related:
Likelihood of a CHAdeMO adapter for the Model S
DC charging is very simple: charge up to the wanted voltage with maximum current. when voltage is reached, reduced current until reaching minimum level. than charging is finished.
Telsa uses PLC for communication. Before the charging starts, the car send the information to the charger and then charging starts. The car keeps to send "ok" messages to the charger in intervals until charging is finished then it will send the "stop" message.
Telsa uses PLC for communication. Before the charging starts, the car send the information to the charger and then charging starts. The car keeps to send "ok" messages to the charger in intervals until charging is finished then it will send the "stop" message.
WhiteKnight
_____ P85 #549 _____ Sig Red / Sig White
The 85 kWh Model S includes free unlimited supercharging, which makes me think that the 60 kWh will have the option at time of purchase for signing up for unlimited supercharging for a fee. Wrapped up in this fee is the cost of the hardware and software that enables supercharging. So rather than paying per use, you have to decide at time of purchase if you want supercharging for say $1,500 and then you'll get it free for life after that. I think they might go this way because they use the term "optional" which makes me think it's an option when you buy the car, also I was told that it is illegal to sell electricity in the United States (IANAL) if you are not a regulated utility. I am sure there are others on this site that know better about this topic than I do.
NigelM
Recovering Member
Ummm, I sell my excess (PV) production to Florida Power & Light. Somehow I don't think that's a federal offence....
I think you're jumping to a conclusion; it may be that the 85kWh cars include the hardware and software for Supercharging, but that 60kWh purchasers must pay something extra for the SC capability. Tesla has never said that ongoing use of SCs will be free.
It's been on the Model S options page since it was created that supercharging was optional on the 60kWh battery.
No need to sell the electricity. Just rent the use of the parking spot. The electricity is included in the "rent".
Or provide a charging "service". You pay for the time on the connector, not the electricity.
Beavis
Model S Signature 991
It's not a question of legality. In many states, utility regulations do not distinguish between electricity generated for sale to business or residential customers and electricity sold at charging stations. The implication is that charging stations are regulated like a public utility. CA passed legislation to exempt charging stations from the definition of a public utility. CO has pending legislation.
The "TBD" listed on 60 kWh battery for Supercharging is related to the cost, not availability/compatibility.
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