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OpenEVSE Open Source Charging Stations

Discussion in 'Charging Standards and Infrastructure' started by Chris1howell, Sep 12, 2014.

  1. Chris1howell

    Chris1howell Member

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    I have not been very active at TMC with OpenEVSE info. There have been a handful of Tesla owners that have built OpenEVSE units at 40A+, however most development has focused on 30A portable units. I have just released a new board and kit that fit the needs of Tesla owners better. I have been using a prototype 40A unit to charge my Model S for several months as has another TMC member. My UMC now is in the car where it should be...

    OpenEVSE Plus v3 is now avaliable.
    http://store.openevse.com/products/copy-of-openevse-plus-v3 .

    It is a board specifically designed for Level 2 charging stations. To the standard OpenEVSE features (basically everything required in SAE J1772) it adds a opto-isolated line voltage AC relay trigger to drive large contactors. It also adds current measurement.

    To go along with the new board is a 50A Level 2 Charging station kit.
    50A Kit

    Build Guide for 50A Charging Station Kit
    OpenEVSE 50A Charging Station - OpenEV

    http://d17kynu4zpq5hy.cloudfront.net/igi/openevse/uhIhbvIpU14VLu5G.medium
     
  2. tga

    tga Active Member

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    Sweet...
     
  3. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    Do you have any good sources for 70-80 Amp J1772 cords and connectors?
     
  4. lolachampcar

    lolachampcar Active Member

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  5. GSP

    GSP Member

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    #5 GSP, Sep 13, 2014
    Last edited: Sep 13, 2014
  6. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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  7. lolachampcar

    lolachampcar Active Member

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    shoot
    Sorry about that. I'll count myself lucky to have bought one when I did.
     
  8. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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  9. tga

    tga Active Member

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    25 ft, 75A ITT Cannon cable is listed on Digi-Key:

    EVC-C-75A-600-S-25

    Bad news - it's $360, not stocked, and has a minimum order quantity of 50 units ($18,049.76)

    None of the ITT cables or inlets are stocked.
     
  10. GSP

    GSP Member

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    Perhaps clipper creek or Eaton will sell a "replacement cable with plug" for their 80 Amp J1772 EVSEs?

    GSP
     
  11. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    A 75 Amp J-cable from Clipper Creek for retrofitting a Roadster HPC to J1772 costs $595! The kit does include a holster for the J-Plug, but that still seems like a lot of money.
     
  12. GSP

    GSP Member

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    Well, $595 is a lot less than a $18k min order for 50 units! It also is competitive with Tesla's price for the 80 Amp Model S cable.

    Sounds like that is the going rate these days. Reminded me of the old racer saying:

    "(charging) speed costs money. How fast do you want to go?"​

    Personally, at these prices, 40 Amps (30 mph) will probably be my answer.

    GSP
     
  13. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    There is a rumor going around that Tesla is dropping their price for the 80A HPWC from $1,200 to $750. That seems too good to be true, but really makes these a cables seem expensive.
     
  14. mitch672

    mitch672 Active Member

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    #14 mitch672, Sep 13, 2014
    Last edited: Sep 13, 2014
    Here is a link to pictures of the 40A UMC replacement I built with Chris's new HV contactor capable OpenEVSE board, I bought a Tesla UMC connector from Tony Williams, and the EVSE cable from his company as well (It was a challenge to splice them together, used "heat shrink" butt style connectors with solder embedded in them, then taped it all up and then overall shrink on that with a torch)

    40A-OpenEVSE Slideshow by mitch672 | Photobucket

    I've also built a 75A OpenEVSE with the ITT 75A cable, it's what I use everyday on my Dual charger Model S
    OpenEVSE Slideshow by mitch672 | Photobucket
    (the 40A OpenEVSE UMC replacement is at another house)
     
  15. Cosmacelf

    Cosmacelf Active Member

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    I'm selling mine for $149. See

    70A J1772 Cord and Plug | eBay
     
  16. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    The listing says Sold. Do you you have any more, or was this a one of a kind?
     
  17. Cosmacelf

    Cosmacelf Active Member

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    Damn, this board gets results. No sooner had I posted that link, then it got sold. Sorry, just had the one. I think I had purchased it from tucsonev,com, but they don't seem to sell high power J1772 cables anymore.
     
  18. tga

    tga Active Member

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    The only place I've seen them listed for sale is at manzanitamicro.com, $345 for 75A. No idea if they are in stock (or even still available):

    Manzanita Micro

    I did check to see if Kickstarter could be used as "escrow service" for a big order, but their rules prohibit resale; you have to be creating something.
     
  19. Cosmacelf

    Cosmacelf Active Member

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  20. wycolo

    wycolo Active Member

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    #20 wycolo, Sep 15, 2014
    Last edited: Sep 15, 2014
    They don't spec the plug itself. Also derate the cable to 50/60A, whatever that means. Also, DigiKey omits wire gauge of their 70A plug/cable combo.


    Curious, I checked out my still unused CS-60: rated "48A continuous":

    Cord - 3x8ga, 1x18ga.
    Plug - no name - sticker says "70A at 240/120".

    If I upgraded the contactor as well as the circuit board this could make a 70A j1772 (or less if the cable gets too hot).
    --
     

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