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Short and sweet J-1772 to Roadster adapter - lockable

Discussion in 'Tesla Parts for Sale' started by hcsharp, May 4, 2012.

  1. hcsharp

    hcsharp Active Member

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    rgjones thank you so much for your support! You've been a big help and I wish I could afford to give you a commission!!!
    :redface:(trying not to feel guilty now for making you pay for a prototype...)
    Seriously, really glad to hear it's working out!

     
  2. Timothy

    Timothy Driving on Sunshine

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    My unit arrived today and I am eager to buy the padlock try charging with it tomorrow!

    One of my new techy friends I met at Earth Day here in Santa Barbara was concerned that disconnecting the J-connector without turning the charging off in the car first could blow a fuse. Do you think this extra step of turning the charging off in the car first is necessary?
     
  3. TEG

    TEG TMC Moderator

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    Pressing the release button on the J-plug, and starting to pull it out is supposed to tell the car to stop charging before the power pins get disconnected.
    Do we know if that mechanism is preserved through this adapter? I think Tom Saxon had some concerns about that sort of thing.
     
  4. doug

    doug Administrator / Head Moderator

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    The Roadster, as is, doesn't use the proximity signal part of the J1772 standard. This was fixed on the Model S.
     
  5. TEG

    TEG TMC Moderator

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    So, I gather that means it would be good practice to stop charging from within the Roadster, or using an "off" button on the EVSE before unplugging the J-plug from the Roadster adapter...
     
  6. vfx

    vfx Well-Known Member

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    We had a conversion in Fashion Island with those who are E-knowledgeable Tom and Jim and the answer was exactly the above^. Anything else would need to be tested (on someone else's car :)
     
  7. hcsharp

    hcsharp Active Member

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    #27 hcsharp, May 9, 2012
    Last edited: Mar 14, 2013
    Pressing the release button on the J- connector, which you have to do to pull it out, stopped the current flowing within a few milliseconds every time I tested this. edit: But not all EVSEs will do this! Read more below./end edit. It first interrupts the proximity detect which causes the J1772 EVSE to immediately stop the pilot signal. When that happens the Roadster stops taking current usually at the next AC crossing (when the voltage is 0 in an AC sine wave), taking at most 16 milliseconds.

    I have tested this on 2 different brand of EVSE and in both cases it performed as expected. edit: But not all work this way! You press the lever and there is no perceptible delay before power stops.

    In summary, it's best to stop charging at the EVSE first, which they all recommend, or with the Tattler, or with the stop button on the VDS, and then by pressing the release button on the J connector.

    As a secondary precaution, the pilot pins on both my adapter and the Roadster are intentionally shorter than the power pins. Thus even if the EVSE failed to shut off the pilot as expected, the pilot pin would disconnect first and the Roadster would stop taking current before the power pins disconnected.

    As a third precaution, the sleeves that I used on the Roadster side are rated for up to 20 live disconnects at 80 Amps during their lifetime. So all of the above would have to go wrong 20 times before any significant damage occurred to the adapter. You are probably more likely to get hit by a comet.

    To address another issue mentioned, even if you do a live disconnect, it will not cause the battery fuse to blow. It is essentially the same as a power outage while charging or having the contactor open in the HPC due to a GFI fault. The Roadster is designed to withstand these events, even if it doesn't particularly like them.

    Tom Sax was converting an HPC that did not have any proximity detection which would not be the case with all J1772 stations. Therefore he had a much bigger incentive to handle it reliably with a separate circuit in the car. In theory he could have achieved a similar result by interrupting the pilot signal with the release button but then the system would have been technically out of compliance with J1772 and had unpredictable results charging other cars.

    Hope this helps!
     
  8. TEG

    TEG TMC Moderator

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    Yes, thanks for taking the time to explain all that !
     
  9. dpeilow

    dpeilow Moderator

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    Sounds like you've really thought that through. Good job.
     
  10. strider

    strider Active Member

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    A good use for a Tattler/OVMS to stop the charge as you approach.
     
  11. hcsharp

    hcsharp Active Member

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    Picture me at a public charging station 90 miles from home, oscilloscope in one hand, strange looking adapter with test leads dangling in the other, trying not to electrocute myself, drawing some quizzical looks, collecting data... :scared:
     
  12. TEG

    TEG TMC Moderator

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    // warning... going off topic //

    You have inadvertently led me to my favorite Google search ever... "strange gadget" returned these among others:
    Gadget-Helmet-Daschle--583.jpg
    x3xffa23a4627885fc5ce7467952ecc57e5.jpg
    stone-usb-hub_1.jpg
    [​IMG]
    [​IMG]
     
  13. vfx

    vfx Well-Known Member

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    Have one!

    Even used it in a camping situ just like pictured. Perfect when only two can fit on a mountaintop.
     
  14. Bradleybang

    Bradleybang Member

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    I am on a trip to Pebble Beach for the weekend. Realizing the stations have all gone j1772 I ordered one of Henry's adapters. He was kind enough to overnight the part with my FedEx account. As I type this message my car is charging at 70A at Rabobank in Salinas.
    Photo to follow.

    Thank you Henry. It's better than the pictures.
     
  15. Botbldr45

    Botbldr45 Member

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    Would love to get one ......
    Who do I contact and would anybody like a Tesla version ( never used)......
     
  16. bonnie

    bonnie Oil is for sissies.

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    Send hcsharp a pm (first poster in this thread).
     
  17. bonnie

    bonnie Oil is for sissies.

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    fyi - for those of you who buy - a camera lens case is perfect for storage. The adaptor measures approx 6.5" long x 3.25" diameter (or 165mm x 82.55mm). Plenty of padded lens cases on eBay, like this one:

    lens case.jpg
     
  18. DrTaras

    DrTaras R254->R725->S->X->M3-->R2020?

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    Thanx Bonnie!
     
  19. Botbldr45

    Botbldr45 Member

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    Thank you ..... Just did it:rolleyes:
     
  20. doug

    doug Administrator / Head Moderator

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    No demo vids yet?
     

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