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Won't complete charge on 15 amps 120 volts

Discussion in 'Model S' started by montgom626, Nov 27, 2013.

  1. montgom626

    montgom626 Active Member

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    I noticed that my car stops charging after 60-120 minutes when plugged into 15 amp 120 volt circuit (NEMA 5-15). I am on FW 5.8. This is new behavior since FW 5.8. I think others have noticed this??? Any solutions???
     
  2. mknox

    mknox Well-Known Member

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    I haven't used 120 volts on 5.8 yet, but did this past summer at a friend's summer cottage. It took the whole weekend, but it did complete. Ditto a few weeks ago at an overnight business conference. Charged for about 24 hours straight.

    I have had some issues with 240 volt charging on 5.8 as described in this thread. I wonder if there is any relationship?
     
  3. JohnQ

    JohnQ Active Member

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    I'm on 5.8 and have been charging on a NEMA 5-15 the past two days. No problems leaving it charging for hours on end.
     
  4. captain_zap

    captain_zap Electron tamer

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    If you are on a 15 amp circuit (meaning a 15 amp breaker and NEMA 5-15), then you can only safely draw 12 amps. Unless you are on a dedicated circuit, there are other loads which can be switched on. When the other loads are switched on, this can cause the car to sense voltage drop and stop charging.
     
  5. montgom626

    montgom626 Active Member

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    It only draws 12 amps. Good point. I will switch to another circuit.
     
  6. wcalvin

    wcalvin Member

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    Your trouble is likely that someone else has added a load on the circuit, dropping your voltage at the car below 100 v, at which point the charger disconnects.

    I have been suffering with two 120v outlets that have so much series resistance behind the wall that a 12 amp load will drop the voltage reaching the charger below 100. Originally thought it was my extension cord but then one of them did it without the extension cord. Now I am using a third outlet 100' away that doesn't have the problem. The extension cord drops 118 to 110. If there was something else on that circuit that cause it to start out from the outlet at 110v 12 amp, then I would have your problem because the car would see 100 v.
     
  7. montgom626

    montgom626 Active Member

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    I am going to test another circuit tonight. I don't know of anything else on the circuit.
     
  8. mnx

    mnx 2013 P85

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    You can always drop the charge rate a couple amps, that might solve the problem as well.
     
  9. mknox

    mknox Well-Known Member

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    The OP doesn't say where in the USA he lives. If it's cold like here, that might maintain the connection, but not actually put any energy into the pack!
     
  10. montgom626

    montgom626 Active Member

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    Wisconsin and it was and is really cold. 10F this am. FWIW, the UMC was doing nothing, not charging, nothing.
     
  11. cinergi

    cinergi Active Member

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    By far the fastest solution is to call Tesla roadside assistance and ask for help. They can check logs and whatnot and if they can't see the problem, they can have engineers dig in and/or work with the service center to fix whatever's broken.
     
  12. montgom626

    montgom626 Active Member

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    Bad outlet, charges great at 120 volt, 12 amps

    I took the great advice here (thanks to everyone) and moved to a different outlet. Works fine.
     
  13. SCW-Greg

    SCW-Greg Active Member

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    I've been plugged into a 5-20 outlet, with no issue, charging for 24 hours to 90%. Bummer that I don't have a 5-20 adapter, as the Tesla thinks it's a 5-15, and won't let me pull more than 12A. At least I've been seeing a constant 121 to 122 volts coming out of this outlet.

    Quick poll...
    Has anyone *ever* been able to get the "stated" charge speed of 5-6 mph on a 110 outlet??
    Best I've ever seen is 4, which I'm figuring is the normal rate.
     
  14. jcaspar

    jcaspar Member

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    Website states 3 miles per hr. That's what I get:
    [TR="bgcolor: transparent"][TH="bgcolor: transparent, align: right"] [/TH][TH="bgcolor: transparent, align: right"] [/TH][TH="bgcolor: transparent, align: right"]VOLTS / AMPS[/TH][TH="bgcolor: transparent, align: right"]KILOWATTS[/TH][TH="class: center, bgcolor: transparent, align: center"]MILES OF RANGE PER
    HOUR OF CHARGE[/TH][/TR][TR="bgcolor: #F7F7F7"][/TR][TR="bgcolor: transparent"][/TR][TR="bgcolor: #F7F7F7"][/TR][TR="bgcolor: transparent"][/TR][TR="bgcolor: #F7F7F7"][/TR]
    NEMA 5-15Standard Outlet110 V / 12 A1.4 kW3NEMA 14-50RVs and Campsites240 V / 40 A10 kW29NEMA 6-50Welding Equipment240 V / 40 A10 kW29NEMA 10-30Older Dryers240 V / 24 A5.8 kW17NEMA 14-30Newer Dryers240 V / 24 A5.8 kW17
     
  15. gg_got_a_tesla

    gg_got_a_tesla Model S: VIN P65513, Model 3 Res Holder

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    I got a 5-20 adapter from Tesla and have been plugging into 5-20 outlets at work drawing 16A at 110-111V. Although the car and the iPhone app indicate that the car's charging at 5 mph, the actual rate according to VisibleTesla is around 4.7 mph. That's the best I've seen.
     
  16. SCW-Greg

    SCW-Greg Active Member

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    @jcaspar, thanks for the update. The old web site calculators used to indicate 5 I believe.

    @gg, thanks for that update. At least 4.7 could help take the edge off over a long weekend... get me nearly 24 more miles in a day.
     
  17. islandbayy

    islandbayy Active Member

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    I have seen 6 and 7 on the 5-20 adapter, and the best I've seen on a 5-15 was 5, and just barely, on a outlet 5 ft from the meter that was 20 ft from the transformer (almost no voltage loss)
     

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