I found this video very informative about J1772

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5 thoughts on “I found this video very informative about J1772”
  1. Was interesting. I learned some things:

    1) there is no L3, there is L1 and L2 AC and L1 and L2 DC. I never head of L1 DC being used and looks like only L2 DC has been rolled out.

    2) J1772 can actually do L1 DC as well up to ~50kW at 600V. Shame Leaf couldn’t have used that in 2010 instead of chademo but then it might have made J1772 plugs even more complex when having 2 ways to DC charge on a station. Really would have been nice if they had made those AC pins the same size as the DC pins so it could have been a single plug.

    3) It wasn’t a ‘standard’ till 2016 and before was a recommendation. That explains the short sighted initial design and patch to make it usable for reasonably fast charging. It is a shame they couldn’t have dropped that handle and added 3 phase option (that I do most of my public charging in the USA at, see 208V), but then we are back to J3068 which I had hoped the USA Model 3 was going to use.

    I really hope MCS, that is needed by semi (and IMO 150kWh+ trucks/cars), replaces the T and both CCS designs for everyone but we will see.

  2. Just one correction: with AC charging, it’s the AC EVSE that announces the amount of current available (in amps) to the BEV, not the other way around. AC EVSEs are basically just protective relays, so that no current is supplied if the plug is not connected to a compliant vehicle, and that will cut the power immediately due to some problem with the car, cable, or if the cable is disconnected. An AC EVSE does not interfere in any way with the energy that flows through it (apart from the relay); it’s the car that decides how much current to draw, limiting the maximum to whatever the EVSE announces through the PWM protocol.

  3. Imo, it does not make sense to make this distinction between L1&2 and DC fast charge outside of this acedemic understanding.

    Charging is so relatively complicated that we should be allowed to use “Level 3” and “DC fast” and “Supercharge” interchangeably. Arguing otherwise is gatekeeping on something we EV enthusiasts should really not want to gatekeep on.

  4. Why do US people even care about what “level” it is, l1 l2 l3 etc? In Germany we just say 50kW for example. The term “hypercharger” or “hpc” is used for 150kW or higher, but there’s no l1.

    Also, just say “CCS” 😛

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