TESLA SC to CHAdeMo Adapter

[ki...@hughes.net]

I have searched the web to no avail.  Has anyone seen an adapter that would allow me to charge my Leaf from a TESLA Super Charger station?

[chris1howell .]

There is not an adaptor to do this and it probably will never happen. Even if the hardware was built, Tesla would likely block it as the vehicle sends the VIN and other digital information at the start of a supercharging session.

Tesla owners who paid $2000 each to enable supercharging would likely be pretty upset if a bunch of Leafs and other CHAdeMO cars were blocking the stalls sipping juice at <50kw (superchargers can provide up to 133kw).

In the future other manufactures may partner with Tesla. I would guess it will be longer range vehicles as the spacing from station to station is not compatible with vehicles less than 200 mile range.

[Danny ter Haar]

On Saturday, February 14, 2015 at 11:00:45 AM UTC-8, Chris wrote:

There is not an adaptor to do this and it probably will never happen. Even if the hardware was built, Tesla would likely block it as the vehicle sends the VIN and other digital information at the start of a supercharging session.

Vin numbers can be spoofed, so one of the other rules seems to be:

I believe the car sends GPS data to the "mothership" so only the vin numbers in the neighborhood of the charger are actually allowed to charge.

[Nick Sayer]

If Tesla really wanted to, they could use some kind of PKI to make it cryptographically "impossible" to spoof a car.

If it were me, that's probably what I'd do. I'd make a vehicle identification certificate that's part of each car. The private key for that certificate would be contained in an HSM chip buried in the computers in the car. They make those things nowadays so that they're quite resilient to attack (the attacks are so expensive that it's unlikely that attacking them are cost effective). Here's an example: http://www.digikey.com/product-detail/en/ATECC108A-SSHCZ-B/ATECC108A-SSHCZ-B-ND/4866685

[ki...@hughes.net]

Nick, I agree that would be the reasonable approach but I wonder if they actually implemented any VIN protection at all.  I seem to remember I read somewhere that the TESLA communicates via a "carrier current" on the charging wires.  They would need some way to communicate reliably.  If they use a PKI approach the SC stations might have to have a record of the acceptable VIN.  The logistics of PKI maintenance could outweigh the potential loss of electricity.  Out here in the middle of the desert the lose of digital communications occurs more often than in the big cities.  Nothing would anger a TESLA owner more than not being able to FC on the way to wherever. 

Whatever happened to Elon's interest in encouraging the advancement of EV across the nation?

[Nick Sayer]

I'm pretty sure that the SC auth protocol goes over wireless. And I'm sure that insuring the correct wireless coverage is part of the site survey for potential SC locations. The beauty of PKI is that the SCs *don't* need a list of VINs. The car's identity certificate simply needs to properly chain, and the SC can verify that with a single public key. It's a problem that's been solved for nearly 30 years now publicly, and probably secretly (government) for far longer. 

Still, another way is for the SC to verify that the car with the given VIN is actually located *at* the SC in question through that same wireless connection (Tesla has GPS locating on all of their cars).

I think Tesla is well within their rights to price supercharger access as they like, and their current pricing is lifetime for $2k-ish at purchase time. Someone reverse-engineering it would be stealing. That's not the case with CHAdeMO, since the pricing model is different. 

Nothing's stopping Nissan from funding a similar fleet of CHAdeMOs strategically located. Maybe GM will do something similar with J1772 "Micky mouse" EVSEs for the Bolt in 2016. 

Sent from my iPhone

--
You received this message because you are subscribed to a topic in the Google Groups "OpenEVSE" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/openevse/HaYzz9bZyk4/unsubscribe.
To unsubscribe from this group and all its topics, send an email to openevse+u...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[gnuarm.del...@gmail.com]

I know this is an old thread.  I just wanted to point out that Tesla could do the handshake through the car if nothing else.  Connect charger to car and the car reports back to the mothership.  Then the car can be the link for the charger to communicate to the mothership.  A simple stimulus/response hand shake would preclude unauthorized charging. 

I know Tesla has the means to disable cars from charging at all.  It has happened when someone buys a salvage car and fixes it up to be on the road again.  Tesla doesn't want that car on the charging network until it has been Injected, Inspected, Detected, Infected, Neglected and Selected like in Alice's Restaurant.  I think they have a pretty hefty charge like maybe $10,000.  8-o

So somehow they can stop illegitimate charging and I can't imagine it isn't something pretty good.

  Rick C.

  - Get 6 months of free supercharging
  - Tesla referral code - https://ts.la/richard11209

[Marcin Chojnowski]

From what I know all this config is within the car. Not all Teslas are always connected. So calling mothership every time you plugin into SC doesn't happen. But as Tesla can remotely access any car of their fleet they can disable features that way. Also most of the diagnostics happens remotely.

There are some folks that take your car off Tesla VPN and make everything working again including SC charging. 

You received this message because you are subscribed to the Google Groups "OpenEVSE" group.
To unsubscribe from this group and stop receiving emails from it, send an email to openevse+u...@googlegroups.com.