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Unscheduled charge?

Discussion in 'Model S: Battery & Charging' started by scaesare, Jan 23, 2014.

  1. scaesare

    scaesare Active Member

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    Well, that was interesting... my car seems to have taken a brief unscheduled charge. If VisibleTesla (a great little app by jpasqua here) is to be believed, my car decided to start charging at about 7:12am this morning and finished 35 minutes later at 90% SOC.

    What's odd is that I don't have this scheduled anywhere. My car is itself scheduled to start at 2am. The VisibleTesla app can initiate charging, but I currently do not have it set to do so (I double checked), but rather only report changes. The app does initiate HVAC on every morning at 7am, but that's not when the charging started.

    I've had this identical setup running for some time, and this is the first time I've seen that happen. I've had the car parked for a couple of days... but it's attached to shore power... so it should be topped back up after the normal 2am charge, so I wouldn't hav eexpected it to decide to charge on it's own just a short time later. It never has previously that I've seen.

    Odd.
     
  2. Krugerrand

    Krugerrand Active Member

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    Mwhahahahhahahahahaaha! I am reminded of a little movie called Demon Seed.
     
  3. Cottonwood

    Cottonwood Roadster#433, Model S#S37

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    Was the car there a while? When I have seen this, it was when the vampire needed to wake up and take a drink so the battery would not get too low.
     
  4. Martini

    Martini Member

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  5. scaesare

    scaesare Active Member

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    It has been parked since Monday... perhaps that was it. I'm assuming this is the 12v battery charging, as the main pack sould have been topped off a few hour previously...

    Does the 12V DC-DC charger automatically draw shore power if plugged in (as does the HVAC)?
     
  6. mknox

    mknox Well-Known Member

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    In my experience, the car will top itself up every other day, but it always respects the timer if set. I left for vacation with my timer set for 10:00 PM and when it did top up, it always initiated at 10:00 PM which meant I didn't end up using On-Peak electricity inadvertently.
     
  7. Trnsl8r

    Trnsl8r Blue 85kwh since 12/8/12

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    Like mknox said, it's probably just a top off. I seem to recall that the car will allow itself to charge up to six hours after charging is scheduled, so if you schedule it for 2 a.m., then 7:12 is still within its allowable window.
     
  8. J in MN

    J in MN S60 P12635

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    Trnsl8r is correct.

    The 12V is recharged from the main battery, and the main battery will be topped up once its SOC is 3% below your setpoint. If that happens within the 6 hour window, it will charge immediately, otherwise wait for the next scheduled start time.
     
  9. scaesare

    scaesare Active Member

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    That sounds like it then... not sure I've ever had the monitor app running when it happened.

    Thanks for the replies.
     

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