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Thread: Spare charging cord

  1. #11
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    Thanks Jerry. However, this suggests there is just one 'S-connect' plug for the model S side and three adapters on the power side. If this is true then what Mitch suggests can't be done.

    For My part I'd sure like to keep the EVSE with available adapters in my Car and have a second 'S-connect; plug wired to my garage box. For the roadster a second EVSE is $1500. For the model S one could buy the high power wall charger at $1200. Since I won't have the twin charger option (not much sense for the 40kWh battery) this latter option doesn't have much value for me. At this point, a second EVSE makes the most sense to accomplish my goal. I just can't understand why it is so much on the roadster (with a probable similar cost for the model S). It seems like one could custom build an open EVSE box for a fraction of the cost. The problem being how to get just the S-connect plug. Since it's proprietary I don't expect low cost option to come up any time soon.

  2. #12
    Roadster #1144 + Sig 114 dsm363's Avatar
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    I find the need for a second UMC around town (for me) at almost zero. I'll never take a spontaneous 200 mile trip without going home first to pick up the UMC I keep plugged into my garage. I do however keep the J1772 adapter in my trunk for the Model S. That way if that rare circumstance did happen, I would at least be able to plug into public J1772 charge stations in various cities but not at RV parks. At long trip I go on I of course just unplug the UMC and put it in the trunk.

    If that doesn't work for some people though, I think a second UMC should be cheaper than the HPWC so that would be the cheapest Tesla provided option if you need a second UMC in the trunk at all times.
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  3. #13
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    As others have noted, I'd also just unplug the main UMC and put it in the trunk when I'm going to be travelling. You could buy another and some folks will. For me, I figured I might want a road trip spare cable 1/month at most x 10 years = 120 times. A UMC costs 1200, so I thought about 10 seconds on that and went:

    "Yea, there's no way in hell I'm effectively spending $10 per trip for a spare cable when it'd take me 15 seconds to unplug my other one."

    I suppose I'm cheap though.

  4. #14
    S85 - VIN:P05130 - 3/2/13 jerry33's Avatar
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    Quote Originally Posted by NeedToDrive View Post
    However, this suggests there is just one 'S-connect' plug for the model S side and three adapters on the power side. If this is true then what Mitch suggests can't be done.
    Based on that and what was in the Get Amped cars, you get one UMC and three adapters. The Model S end is part of the UMC. You will be able to purchase more adapters for different receptacles if you need them.

    Quote Originally Posted by NeedToDrive View Post
    For My part I'd sure like to keep the EVSE with available adapters in my Car and have a second 'S-connect; plug wired to my garage box. For the roadster a second EVSE is $1500. For the model S one could buy the high power wall charger at $1200. Since I won't have the twin charger option (not much sense for the 40kWh battery) this latter option doesn't have much value for me. At this point, a second EVSE makes the most sense to accomplish my goal. I just can't understand why it is so much on the roadster (with a probable similar cost for the model S). It seems like one could custom build an open EVSE box for a fraction of the cost. The problem being how to get just the S-connect plug. Since it's proprietary I don't expect low cost option to come up any time soon.
    It's been posted that the UMC for the Model S is $500. Whether that is correct or not...
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  5. #15
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    The J-1772 to Model S adapter is totally seperate from the UMC, see the picture on this post.

    Use with an "OpenEVSE", you have a home charging station for 1/2 the cost of the HPWC ($1,200)
    You can build a 75A OpenEVSE for around $600, see my build.

    Tesla has not published the cost of a spare UMC for the Model S. I don't imagine it will me cheap, nothing is from Tesla.

    http://code.google.com/p/open-evse/wiki/75AOpenEVSE

    J1772 adapter, charging practicalities - Page 5
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    I support OpenEVSE: http://code.google.com/p/open-evse/

  6. #16
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    Quote Originally Posted by mitch672 View Post
    The J-1772 to Model S adapter is totally separate from the UMC, see the picture on this post.
    Thanks Mitch. That was the confirmation I was looking for. When I get my model S I'll be looking into building my own.

  7. #17
    Roadster 919, S 2006 Doug_G's Avatar
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    Quote Originally Posted by dsm363 View Post
    I find the need for a second UMC around town (for me) at almost zero. I'll never take a spontaneous 200 mile trip without going home first to pick up the UMC I keep plugged into my garage. I do however keep the J1772 adapter in my trunk for the Model S. That way if that rare circumstance did happen, I would at least be able to plug into public J1772 charge stations in various cities but not at RV parks. At long trip I go on I of course just unplug the UMC and put it in the trunk.
    Right. I was initially thinking that I'd charge with the UMC in the garage, but would want to carry a second one in the car. I'm now rethinking that.

    Around here, a year ago there was no J1772 infrastructure anywhere, period. Nada. That is now changing rapidly. I can find J1772's around town. I can drive to Toronto or Montreal and find them at my destination and along the route. A year ago I had to take my Roadster's UMC along on a road trip. Now I'd be okay leaving it at home (I like having backup plans so I'll still take it).

    In light of that I'll probably skip the extra UMC, and just keep the J1772 adapter in the car.
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  8. #18
    Roadster #1144 + Sig 114 dsm363's Avatar
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    Quote Originally Posted by Doug_G View Post
    Right. I was initially thinking that I'd charge with the UMC in the garage, but would want to carry a second one in the car. I'm now rethinking that.

    Around here, a year ago there was no J1772 infrastructure anywhere, period. Nada. That is now changing rapidly. I can find J1772's around town. I can drive to Toronto or Montreal and find them at my destination and along the route. A year ago I had to take my Roadster's UMC along on a road trip. Now I'd be okay leaving it at home (I like having backup plans so I'll still take it).

    In light of that I'll probably skip the extra UMC, and just keep the J1772 adapter in the car.
    I agree with you, having a backup on a trip is never a bad idea. I took the UMC with me on my 150 mile trip yesterday even though I knew I wouldn't need it but I was going to an area with zero J1772 chargers but plenty of RV parks in a pinch.
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  9. #19
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    My logic for getting a spare UMC is more paranoid. If my UMC dies or is broken or damaged or stolen, it becomes impossible to charge the car in my garage (since I'm not getting an HPWC). At that point, I have about a month to get a new UMC, or hog a J1772 station, before my CAR dies. While I'm sure Tesla would happily express-mail a new UMC, it would be much less anxiety-inducing to just pull out the spare.
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  10. #20
    Roadster #1144 + Sig 114 dsm363's Avatar
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    Quote Originally Posted by neroden View Post
    My logic for getting a spare UMC is more paranoid. If my UMC dies or is broken or damaged or stolen, it becomes impossible to charge the car in my garage (since I'm not getting an HPWC). At that point, I have about a month to get a new UMC, or hog a J1772 station, before my CAR dies. While I'm sure Tesla would happily express-mail a new UMC, it would be much less anxiety-inducing to just pull out the spare.
    You would only have a month if your car was already at empty. If you charge every night like Tesla suggests and have over a 50% SOC when the UMC goes bad you have a year to get a replacement. I'm pretty sure your car would make it the time it takes Tesla to FedEx a replacement. That of course doesn't mean you shouldn't get a backup if you want it. Can always leave it in the trunk for trips as some people are planing.
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