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How to design my garage?

Discussion in 'Model S: Battery & Charging' started by Citizen-T, Aug 30, 2011.

  1. Citizen-T

    Citizen-T Active Member

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    So, I'm in the process of building a new home and therefore have the unique opportunity to setup the garage with the perfect configuration for my Model S. I thought I'd offer this up to the community: how should I design my garage?

    Specifically, where should I put plugs? What kinds of plugs? At what height? How many volts/amps? Any other thoughts aside from the electrical setup?

    Thanks.

    P.S. Garage floor plan is attached.
     

    Attached Files:

  2. TEG

    TEG TMC Moderator

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    How many spare amps do you have to put to the garage? Can you get 240V 90A to the left side of the garage (upper right part of your PDF?).

    Tesla hasn't released details of which charge plugs they will support. I think it would be a safe bet to think at a minimum you could get a [email protected] J1772 based EVSE to put there. Possibly buy one from Clipper Creek, or wait to see what Tesla offers for sale along with Model S.
     
  3. dpeilow

    dpeilow Moderator

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    Prepare for a 240V, 100A circuit.
     
  4. doug

    doug Administrator / Head Moderator

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    Might you have more than one EV in the future?
     
  5. AnOutsider

    AnOutsider S532 # XS27

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    Not to hijack, but I might. I'm in a similar position as the thread-starter, though my builder is one of those "green builders" so they're planning solar this and green that. We haven't yet discussed electrical requirements so I'm equally interested in the knowledge in this thread.
     
  6. doug

    doug Administrator / Head Moderator

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    I'd say try to design for expandability.
     
  7. NigelM

    NigelM Recovering Member

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    I placed my NEMA 14-50 socket on the center of the back wall - that way the charge cable reaches the car easily regardless of whether I park forwards or reversed into my garage. I would have put the socket 2ft above the ground so that the charger would rest on the floor and the weight wouldn't be pulling down on the plug; however, local regs dictate that 220v/50A garage sockets must be 48" off the floor.

    Tip, make sure you can place a hook or similar on the wall near the socket to hang the cable when not in use.
     
  8. Lloyd

    Lloyd Active Member

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    #8 Lloyd, Aug 30, 2011
    Last edited: Aug 30, 2011
    I would wire each parking stall (right and left sides) with 4 x #4 wires so you have 100 amps available to each stall. L1, L2, Neutral and Ground. You may not need to use the Neutral, but it is there for you in case you need it. You might not use them all at the same time, or you could program them to charge at lower levels for longer periods. You can choose the recepticle or EVSE at a later time when needed. 48 inches would be a great height as mentioned above. Have your contractor leave you a 2 to 3 foot + tail so you can connect an EVSE directly.

    Additionally, I would put a protected Nema 14-50 or wired box on the exterior of each side of your garage. Then you will have power available for all of your Tesla Motors Club friends when they come to visit.
     
  9. edo

    edo Member

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    Consider installing 3 phase. It is probably going to be the source of choice for your next electric car (after the Model S). It may be cost prohibitive, but worth looking into.
    In the meantime, up two three bays can be on a different phase.
     
  10. Thumper

    Thumper Member

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    I would consider running conduit to the area under where cars will park and making a rectangle under the car a separate pour from the main slab. That way you can semi-conveniently add inductive charging when it comes.
     
  11. AnOutsider

    AnOutsider S532 # XS27

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    Yeah, I really like the idea of inductive, but haven't seen Tesla mention anything about it
     
  12. markwj

    markwj Moderator, Asia Pacific

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    +1

    Mine wired up the EVSE directly, with about 9" of wire. When time came to add a meter, it was a pain.

    So, think about meters (in particular if you are planning for solar) and add them at the same time (or leave plenty of cable and space free for them later).
     
  13. GSP

    GSP Member

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    Check with your local electric utility company. Many have special EV rates, and will provide a separate meter for your EV(s). Some have DOE funds to provide free ESVEs to their customers as well.

    GSP
     
  14. Doug_G

    Doug_G Lead Moderator

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    IMHO, NEMA 14-50 is plenty for overnight charging, and is a lot less expensive to install.
     
  15. vfx

    vfx Well-Known Member

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    =1 on an exterior plug box for other EV in your drive or street. Once you have an EV you will have friends with them. Share.
     
  16. Jaff

    Jaff Active Member

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    Excellent idea for the "extra" NEMA 14-50 for additional cars to charge outside...when I install a second service for the Model S next year, I think I'll install an auxiliary jack for this purpose!
     
  17. Citizen-T

    Citizen-T Active Member

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    Thanks for all the input guys. The information is very helpful.

    I do anticipate having two EVs at some point so I'll definitely put two outlets in the garage -- one on each side. I think I'll actually do one on the wall opposite the garage door and one on the side wall. That way I'll be able to accommodate both EVs that have the plug on the front of the car (like the Leaf) and those that have it on the side (e.g. Volt). I imagine I'll probably back the Model S in. Since the port is on the rear of the vehicle, I can also use the one on the wall opposite the garage door.

    Love the idea of putting one on the exterior as well. I'll ask about this.
     
  18. vfx

    vfx Well-Known Member

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  19. doug

    doug Administrator / Head Moderator

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  20. malcolm

    malcolm Active Member

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    If you're going for two chargers and two cars then think about durability of cables; can one car be driven over the cable on the floor while the other car is still charging?

    Also - in which direction will your garage door (doors?) open? Up and over isn't a problem (unless you decide to suspend a cable). Side opening can catch you out :biggrin:
     

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