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Is it normal for the wall connector cable to get hot @80 amps?

Discussion in 'Model S: Battery & Charging' started by BrettS, Apr 3, 2017.

  1. BrettS

    BrettS Member

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    I just picked up my new (to me) 2015 Model S with dual chargers. I also finished installing my wall connector on a 100 amp circuit and set it to charge at 80 amps. After 2 hours of charging the cable between the wall connector and the car was getting pretty hot. Almost too hot to comfortably hold, especially in the first 2 or 3 feet closest to the charger.

    I know 80 amps is the top end for that charger, but I'm wondering if it's normal for the cable to get that hot.

    Thanks
     
  2. 365gtb4

    365gtb4 Member

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    Not normal. I have two HPWC charging at 80A and they will get warm but never hot. I would get an infrared thermometer and measure the temperature along the cable and at each end and see what's going on. Until the issues is resolved I would reduce the amperage to maybe 40 amps.
     
  3. BrettS

    BrettS Member

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    Ok, thanks. I guess that's a bit of a concern then. I'm in florida and it was pretty warm today. Probably close to 90. The charger is in the garage, but I'm not sure it was really much cooler in the garage anyway. I'm sure the high ambient temp didn't help
     
  4. Rodolfo Paiz

    Rodolfo Paiz P85 "Plug and Play"

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    It does get somewhat hot. As for how hot is OK, you may want to check with your Tesla local service people. It's never bothered me.

    Also, remember that your battery can handle 80A and supercharging, but it'll live longer and age more gracefully if you charge more slowly. Also, lithium-ion batteries are happiest (and age best) when they spend as little time as possible either full or empty. If you use 50% of the battery on a day with lots of driving, for example, you may want to charge only to 80% so your use of the battery ranges from 30% when you come home to 80% the next morning.

    Since I rarely needed more than 100 miles in a day, for example, I charged my Model S to 75%, giving me rated range of 195 miles. I'd come back home with 75-100 miles of rated range left in the very worst days (about 30% to 40%), and I've charge overnight at 20A/240V so it would take 5-6 hours to recharge back to 195. Lastly, every month or two, I'd do a full charge to 100% so the pack would "balance" itself.

    I was never ever stressed for lack of range, and after four years my battery still held 98% of its original range. Anecdotal yes, but based on good science. Make sure you aren't living with range anxiety, there's no need for that. But while keeping enough range so you always have a great reserve, charging to a lower maximum will keep your battery healthier over time. You don't have to do any of this, but you have the choice if you want to baby your car and keep it in the best possible shape.
     
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  5. AmpedRealtor

    AmpedRealtor Well-Known Member

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    It will get "very warm" at the vehicle connector side and the cable will be quite warm to the touch as well. This is normal. However, if it feels like you are going to scald yourself and get that instinctive reaction to let go or get burned, then I would recommend contacting service to get your charge cord replaced. I've had mine replaced 3 times in the last 4 years. It wasn't until the last replacement about 2 years ago when it actually felt like I wasn't going to burn myself.
     
  6. tga

    tga Supporting Member

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    There's lots of discussion here about recent studies that show that faster charging is no where near as bad as originally thought, and may actually be beneficial.

    20kW charging (80A @ 240V), while large in absolute terms, is not all that fast relatively speaking (0.25C for an 85kW battery). Not really worth worrying about from a battery health standpoint. Although charging slower will be easier on your utility, electric system, HPWC/UMC, chargers, etc (mainly due to less heat).
     
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  7. BrettS

    BrettS Member

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    Thanks. I don't think it got quite to that point. I could hold it, but it wasn't really comfortable to do so. I think for now I'll keep an eye on it and see how it does on a cooler day. Then again, we're heading into summer and there are going to be a lot more warmer days ahead.
     
  8. LoL Rick

    LoL Rick Like Buttah

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  9. animorph

    animorph Member

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    If the cable temperature is only high at the HWPC end I would check the connection to the HWPC. Hotter at the car could be a poor connection there.
     

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