4 ms·

Backward compatibility with J1772 (AC only charging standard).

by guardiangod 3y ago

api 3y ago
Can’t the Tesla plug also do that? You can plug a Tesla into a normal outlet.
- jvanderbot 3y ago
  You cannot plug a Tesla into a normal outlet without a brick of an adaptor.
  - api 3y ago
    I have a Nissan Leaf and have a brick of an adaptor for J1772. I think it's required for some kind of ground fault or other check circuitry because I know the car has its own built in charging system that deals with AC.
  - ajross 3y ago
    Oh, come on. A Tesla (excuse me, "NACS") plug with AC adapter attached is still less than half the size of a CCS connector. This is what it looks like: https://shop.tesla.com/product/sae-j1772-charging-adapter https://shop.tesla.com/product/sae-j1772-charging-adapter It's just a passive connector. All the signaling is handled internal to the car (which actually supports CCS too, there's a equally passive similar-looking CCS adapter you can buy).
  - Robotbeat 3y ago
    The adapter isn’t big. I put it in my pocket sometimes. But it’s worth noting the Tesla plug that does both AC and Fast Dc charging is smaller than the J1772 plug that does AC alone. And the J1772 to Tesla adapter is purely mechanical and conductive, no active components. So it’s cheap and you can buy 3Rd party ones.
    - jvanderbot 3y ago
      Oh! We're talking about the connector. For some reason I thought we were connecting to wall power, which requires a brick sized power converter and thick cable.
      - cptskippy 3y ago
        It's not even a power converter, it's just some contactors and a microcontroller that tells the EV what sort of power source it is. The EV talks to the micro and if the input power is compatible the contactors close and deliver AC directly to the EV. The charger onboard the EV takes that AC input and converts it.
        amluto 3y ago
        It’s also functionally identical to the equivalent J1772 device. You can (unwisely!) use dumb adapters in either direction. It’s unwise because there is no way for a passive cable or adapter to tell the car to limit current to anything below 80A.
        Robotbeat 3y ago
        I use a dumb adapter. The J1772 charge box still is able to talk to the Tesla car to negotiate charge current. The digital pins are still present.
        cptskippy 3y ago
        > It’s unwise because there is no way for a passive cable or adapter to tell the car to limit current to anything below 80A. Yes there is, the adapter just passively adapts all 5 pins. The J1772, CCS Combo 1, and NACS are all pin compatible. The EV has an ECU that can detect what is plugged by sensing the configuration on those 3 pins and negotiate accordingly. For older Teslas to support the CCS Combo 1 adapter they require an ECU upgrade. The adapter only needs to passively connect all 5 pins.
        3y ago

Backward compatibility with J1772 (AC only charging standard).

api 3y ago

Can’t the Tesla plug also do that? You can plug a Tesla into a normal outlet.

jvanderbot 3y ago
You cannot plug a Tesla into a normal outlet without a brick of an adaptor.
- api 3y ago
  I have a Nissan Leaf and have a brick of an adaptor for J1772. I think it's required for some kind of ground fault or other check circuitry because I know the car has its own built in charging system that deals with AC.
- ajross 3y ago
  Oh, come on. A Tesla (excuse me, "NACS") plug with AC adapter attached is still less than half the size of a CCS connector. This is what it looks like: https://shop.tesla.com/product/sae-j1772-charging-adapter https://shop.tesla.com/product/sae-j1772-charging-adapter It's just a passive connector. All the signaling is handled internal to the car (which actually supports CCS too, there's a equally passive similar-looking CCS adapter you can buy).
- Robotbeat 3y ago
  The adapter isn’t big. I put it in my pocket sometimes. But it’s worth noting the Tesla plug that does both AC and Fast Dc charging is smaller than the J1772 plug that does AC alone. And the J1772 to Tesla adapter is purely mechanical and conductive, no active components. So it’s cheap and you can buy 3Rd party ones.
  - jvanderbot 3y ago
    Oh! We're talking about the connector. For some reason I thought we were connecting to wall power, which requires a brick sized power converter and thick cable.
    - cptskippy 3y ago
      It's not even a power converter, it's just some contactors and a microcontroller that tells the EV what sort of power source it is. The EV talks to the micro and if the input power is compatible the contactors close and deliver AC directly to the EV. The charger onboard the EV takes that AC input and converts it.
      - amluto 3y ago
        It’s also functionally identical to the equivalent J1772 device. You can (unwisely!) use dumb adapters in either direction. It’s unwise because there is no way for a passive cable or adapter to tell the car to limit current to anything below 80A.
        Robotbeat 3y ago
        I use a dumb adapter. The J1772 charge box still is able to talk to the Tesla car to negotiate charge current. The digital pins are still present.
        cptskippy 3y ago
        > It’s unwise because there is no way for a passive cable or adapter to tell the car to limit current to anything below 80A. Yes there is, the adapter just passively adapts all 5 pins. The J1772, CCS Combo 1, and NACS are all pin compatible. The EV has an ECU that can detect what is plugged by sensing the configuration on those 3 pins and negotiate accordingly. For older Teslas to support the CCS Combo 1 adapter they require an ECU upgrade. The adapter only needs to passively connect all 5 pins.
        3y ago