TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

DIY Home EVSE

Discussion in 'Charging Standards and Infrastructure' started by vfx, Aug 24, 2011.

  1. vfx

    vfx Well-Known Member

    Joined:
    Aug 18, 2006
    Messages:
    14,792
    Location:
    CA CA
  2. W.Petefish

    W.Petefish Active Member

    Joined:
    Apr 29, 2011
    Messages:
    1,059
    Location:
    North Texas (DFW)
    It is good but, it advocates steps that might not be necessary.

    That makes me wonder how much you would save with making your own EVSE?
     
  3. TEG

    TEG TMC Moderator

    Joined:
    Aug 20, 2006
    Messages:
    17,249
    Location:
    Silicon Valley
    There seems to be a fair bit of room to cost reduce from what is available now. Getting down to under half the current prices seems doable.

    Some references:

    My Nissan Leaf Forum View topic - Weekend(s) Project - DIY EVSE
    Home Brew Charging Stations ()

    A fair bit of the cost is still the plug end. It will be nice when you can find good quality J1772 plugs for well under $100...
     
  4. doug

    doug Administrator / Head Moderator

    Joined:
    Nov 28, 2006
    Messages:
    15,912
    Location:
    Stanford, California
    ...in a bin at Home Depot or AutoZone.
     
  5. vfx

    vfx Well-Known Member

    Joined:
    Aug 18, 2006
    Messages:
    14,792
    Location:
    CA CA
    A Leaf friend bought his EVSE at Lowes.
     
  6. W.Petefish

    W.Petefish Active Member

    Joined:
    Apr 29, 2011
    Messages:
    1,059
    Location:
    North Texas (DFW)
    I find that hard to believe.
     
  7. vfx

    vfx Well-Known Member

    Joined:
    Aug 18, 2006
    Messages:
    14,792
    Location:
    CA CA
    From his email.

    We are in the LA/Ventura CA area.
     
  8. TEG

    TEG TMC Moderator

    Joined:
    Aug 20, 2006
    Messages:
    17,249
    Location:
    Silicon Valley
    EVSE to be Available at Lowes
    I think you could build your own for under $500... (But what is all the labor worth?, and you won't have a well tested, certified product...)
     
  9. vfx

    vfx Well-Known Member

    Joined:
    Aug 18, 2006
    Messages:
    14,792
    Location:
    CA CA
    Same reason I bought the Roadster over a conversion that I liked the looks of better.
     
  10. TEG

    TEG TMC Moderator

    Joined:
    Aug 20, 2006
    Messages:
    17,249
    Location:
    Silicon Valley
    Twitter
     
  11. W.Petefish

    W.Petefish Active Member

    Joined:
    Apr 29, 2011
    Messages:
    1,059
    Location:
    North Texas (DFW)
    I stand corrected.
     
  12. W.Petefish

    W.Petefish Active Member

    Joined:
    Apr 29, 2011
    Messages:
    1,059
    Location:
    North Texas (DFW)
    It would be worth it to be able to have control over the size of the EVSE.
     
  13. TEG

    TEG TMC Moderator

    Joined:
    Aug 20, 2006
    Messages:
    17,249
    Location:
    Silicon Valley
    Yes, and there is a lot of learning value in building your own things if you are so inclined and capable.
     
  14. W.Petefish

    W.Petefish Active Member

    Joined:
    Apr 29, 2011
    Messages:
    1,059
    Location:
    North Texas (DFW)
    I think that in my spare time I will try to make one. An instructable will be made for anyone else who wants to attempt to make one.
     
  15. dwegmull

    dwegmull 2013 Model S 85

    Joined:
    Oct 8, 2009
    Messages:
    238
    Location:
    Redwood City, California
    I am (slowly) working on my own charger, mainly as a way to learn about it.
    My goal is a portable charger that can be used when going to a friend's house either for a few hours (i.e. to share a meal) or overnight. To keep light and compact, I decided to design it for a 30Amp circuit (24A continuous). In a typical house, the laundry area is near or in the garage, so I picked a cloth dryer as my plug of choice.
    This is a very basic but safe unit: it has a GFCI, and it implements the full diode check protocol.
    Parts wise, I ordered a 30A cable from a supplier in Arizona which name's escape me at the moment. I was about $300~$400. I'm using a 30A contactor, from Digikey. The GFCI is a "donut" model meant for a hot-tub (available from any hot-tub and spa supplier). I have a tiny power module that takes anything from 90VAC to 240VAC and outputs 24V. From there I create +/-12VDC and +5VDC to power my processor. The "brain" is an Arduino Mini-pro. I have most of the code written which takes only a few KBytes. There is a relay under control of the Arduino that can control the main contactor, in series with the GFCI: as a result, for power to be present, both the GFCI and the J1772 protocol must be happy.
    The whole thing fits in a outdoor grade box (meant to be used for industrial control boxes), sourced from McMaster-Carr. I think it is 7" x7" x5". There is no user interface other than the GFCI reset and test buttons. I figure most cars have plenty of indicators built-in to let the user know what is happening. A possible extension would be a Bluetooth serial port module that would allow me to use my mobile phone as an interface... I figure I'd get the basics right first and the bells and whistles later!
    I will post some updates and pictures here soon.
     
  16. TEG

    TEG TMC Moderator

    Joined:
    Aug 20, 2006
    Messages:
    17,249
    Location:
    Silicon Valley
    Cool! I know you are definitely a 'maker' of all sorts of things.
    Sorry to correct you, but as you probably know, the "charger" is in the car. So people tend to refer to these things as the EVSE or charging equipment.

    Probably these guys:
    J1772 Adapter
     
  17. DaveD

    DaveD EVs Kick Gas!

    Joined:
    Aug 18, 2007
    Messages:
    548
    Location:
    Redmond, WA
    even better would be in the surplus bin, because the Mennekes connector supplants it. Hope springs eternal.
     
  18. dwegmull

    dwegmull 2013 Model S 85

    Joined:
    Oct 8, 2009
    Messages:
    238
    Location:
    Redwood City, California
    Yes, I got the cable from Tucson EV. I just noticed a significant drop in prices: the 70A model (plug + cable) is now down to $250. This is a lot less than I paid for my 30A cable a few months back! I hope this will lead to more DIY projects.
     
  19. TEG

    TEG TMC Moderator

    Joined:
    Aug 20, 2006
    Messages:
    17,249
    Location:
    Silicon Valley
  20. Lloyd

    Lloyd Active Member

    Joined:
    Jan 12, 2011
    Messages:
    4,883
    Location:
    San Luis Obispo, CA
    Wimpy 30 amp charger! It would take about 18 hours to charge an empty Model S battery! Fine for a leaf however.
     

Share This Page