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Did anyone try to charge MS using TT-30 ?

Discussion in 'Model S: Battery & Charging' started by sreehyd, Feb 5, 2013.

  1. sreehyd

    sreehyd Member

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    I checked roadster postings , there are few folks who tried to charge using TT-30 . I am not sure anyone used this RV outlet ? I am planning for a roadtrip and learnt the hotel/motel i made reservation has this setup .

    Any pointers how can we utilize the open port to charge my MS during my stay , This would really help. Below is picture they have sent .


    RV hookups.JPG
     
  2. Lloyd

    Lloyd Active Member

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    There is not a tt-30 adapter available at this time.
     
  3. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    #3 FlasherZ, Feb 5, 2013
    Last edited: Feb 5, 2013
    EDIT again:

    Ok, after some testing - it *can* work.

    The car will limit 120V charging to 20A.

    I connected a 6-50 receptacle to a 120V plug. Wired one way the UMC had red "fault" LED's and the car refused to attempt a charge. I reversed hot and neutral, and the UMC lit up green. The car initially showed 40A (based on the UMC's 6-50 adapter) but dropped to 20A just before charging started. It ramped to 20A and kept charging there for a minute before I pulled the plug.

    All the usual FrankenPlug/FrankenCord disclaimers apply. See the FAQ for more details.

    You'll need to go to a J1772 setup to get more than that, I think.
     
  4. qwk

    qwk Model S P2681

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    Even if there was an adapter, neither the roadster or model S charge at anything over 16A when on a 120V circuit anyway.
     
  5. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    #5 FlasherZ, Feb 5, 2013
    Last edited: Feb 5, 2013
    You know, I hadn't even thought of that -- this is confirmed even when putting a high-amperage 120V circuit onto one of the 240V plugs?

    EDIT AGAIN: See above. I made it work, but limited to 20A.
     
  6. roblab

    roblab Active Member

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    Ah, but you can make one easily. Just as long as you know that it's 110 volt at 24 amps and will take around 30 hours to fill the S battery. Hope I did the math right... but it's only marginally better than the regular 110 volt outlet.
     
  7. jaanton

    jaanton Roadster NA #1026

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    Not true. You can build a TT-30 adapter for the Roadster UMC which will draw 24A @ 120V.
    Wiring UMC for 110/120 volt operation?
     
  8. mitch672

    mitch672 Active Member

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    I have a TT-30 at home (don't ask, I bought an RV Park setup), with OpenEVSE I can set the J-1772 pilot signal to 24A and see how much the Model S draws. The J-1772 standard specifies 16A max on L1 (120V), but it shoud be tested anyway...
     
  9. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    #9 FlasherZ, Feb 5, 2013
    Last edited: Feb 5, 2013
    I'd like to see what the car does for 120V on J1772 with it.

    - - - Updated - - -

    Note that the UMC cares about the polarity of hot vs. neutral. It will take 29-30 hours. (I miscalculated first time...)
     
  10. qwk

    qwk Model S P2681

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  11. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    In case you didn't see my edit, above, the car will limit it to 20A on 120V, though, on the UMC... I connected only 120V to a NEMA 6-50 and the car automatically dropped to 20A when it saw only 120V. Perhaps a TT-30 adapter for the UMC with a software upgrade would allow for 24A to be drawn, but we'd have to wait for the adapter.
     
  12. qwk

    qwk Model S P2681

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    No I didn't notice, Thanks. That is very good to know, although the gain from going from 120V 16A to 120V 20A is minimal(and you need an adapter).
     
  13. jkirkebo

    jkirkebo Model S P85+ VIN 14420 EU

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    From the picture it seems like there are two TT-30 sockets. They might be wired with opposite hots ? If so, one could probably get 30A 240V by making an Y-adapter from 2xTT-30 to a 14-50 (remember to turn down charging amperage) ?
     
  14. qwk

    qwk Model S P2681

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    Usually sockets that are that close together are not on opposite phases. The other factor that comes into consideration, while there are a ton of these in the wild at RV parks, most parks also have one or two NEMA 14-50(I have not been in an RV park that doesn't). I know what I would choose.
     
  15. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    Nitpick: opposite legs. No such thing as opposite phases in modern AC power distribution. :)
     
  16. sreehyd

    sreehyd Member

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    I was told they only carry 30A plugs. So at this time my only choice would be to stop by near by RV park who has 14-50 and charge my car , I bet it would take several hrs to charge up from "zero" state :scared:
     
  17. richkae

    richkae VIN587

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    I made an adapter to charge my Roadster from a TT-30.
    I put a TT-30 outlet in my garage on a 30 amp breaker. Then I made an adapter with a TT-30 plug to 10-30 socket. Then I use the 10-30 pigtail. The 10-30 pigtail sends a 24 amp pilot signal, and the car draws 24 amps at 120 volts.
    I've thrown it in my trunk a few times, but have never used it anywhere other than my garage.
    I figured that if I was charging overnight - for 15+ hours, it would be a huge improvement over 12 or 16 amps.
     
  18. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    Perhaps a 10-30 adapter will allow the car to draw 24A when 120V is present, but I suspect it will limit to 20A like my experiment above. You may need Tesla to create a TT-30 adapter to charge at 120V, 24A.
     
  19. arg

    arg Member

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    May not be that minimal. It's 25% gain in terms of current (and 66% over the 12A drawn from a standard 5-15 socket), but may be more in terms of miles per charging hour, due to the fairly constant drain for auxiliaries.

    People are reporting getting only 2 or 3 mpch with 120V/12A instead of the nominal 5 (perhaps due to weather conditions), so under those conditions the 120V/20A (nominally 8 mpch) might get 5 or 6 mpch - 100% improvement. Admittedly, there are some questionable assumptions in this calculation...
     
  20. bluetinc

    bluetinc Member

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    I have my custom made EVSE with a J1772 plug. I went ahead and set the pilot for 80A, with a 120V feed, and the car automatically limits at 20A. It sounds like they moved the max charge rate down from the Roadster days :(. Perhaps we could convince them to raise it...

    Peter
     

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