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Continuous usb power

Discussion in 'Model X' started by chloedog, Jun 9, 2016.

  1. chloedog

    chloedog Member

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    my usb in the front center console turns off when the car turns off. I swear my model s used to keep the usb powered all the time. Is there a way to have the model X keep the usb powered?
     
  2. Rockster

    Rockster Active Member

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    My S does not power its USB when the car is off. Either your Model S was unique or you are misremembering . :)
     
  3. JeffK

    JeffK Active Member

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    I know this is slightly unrelated, but I have a Prius with a cigarette lighter receptacle that loses power when the car turns off too.

    It's kind of a standard practice to make sure you don't drain the battery.
     
  4. JamesG

    JamesG Member

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    I am struggling with the same issue but withe the 12volt cigarette lighter.
    I am putting together an auxiliary battery system to solve the problem
     
  5. JeffK

    JeffK Active Member

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    I'm not a smoker, but I'd imagine a disposable lighter might be cheaper.
     
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  6. JamesG

    JamesG Member

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    You missed the point. I want the cicarette lighter to be on so I can run my refridge.
     
  7. cantdecide

    cantdecide Member

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    In my S the 12 volt turns off when I leave the car. In my X it stays on 24/7.
     
  8. JamesG

    JamesG Member

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    In my X it shuts off sometimes when the car locks. Sometimes a few hours later. Never stays on till the next morning. Maybe it has to do with the voltage of the Tesla 12v battery. So if I leave the refridge on and the Tesla 12 v battery voltage drops, tha
     
  9. JeffK

    JeffK Active Member

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    Ah, so you mean the receptacle not the lighter itself. If you connect the battery to be charged by the alternator then unless you have some kind of switch to isolate the circuit when you shut off the car you'd probably still end up draining your primary 12v battery. If you don't have it charge via the alternator then your aux battery will drain fairly quickly and you'll be left with warm beer... err fridge contents. I'd be interested to see what you come up with.
     
  10. goneskiian

    goneskiian Active Member

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    You have an alternator in your X? :confused:o_O:p;)
     
  11. JeffK

    JeffK Active Member

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    haha I didn't think he was referring to a Model X

    Same thing would apply in an X sans the alternator though... if you connect the 12 V batteries in parallel so they can remain charged you'd still have to disconnect the aux one to not drain the primary 12V
     
  12. JamesG

    JamesG Member

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    I understand about a cutout relay when the tesla is off. I still think that connecting the 2 batteries in parallel could be a problem. I don't understand the electronics of the tesla 12 v charging system. Possibly the increase of resistance of 2 parallel batteries would fool the tesla charging system and cause a problem.
     
  13. JamesG

    JamesG Member

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    12v to 120v inverter. 120v input 7.5 amp 12v smart charger connected to 35ah sealed battery.
     

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  14. systemcrashed

    systemcrashed Please Reboot

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    Is this built into the fridge itself? Or are you using an auxiliary battery?
     
  15. JamesG

    JamesG Member

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    I am using aux battery in rear under trunk
     
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  16. systemcrashed

    systemcrashed Please Reboot

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    Are you only getting abou 5-6hrs of auxiliary cooling with that setup? Does the fridge run continuously or intermittently, I'm curious how long will it keep things cool?
     
  17. JamesG

    JamesG Member

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    The fridge is on intermittently. Depends on the setting on the fridge/freezer and the temp in the car. Draws between .5 and 2 amps. I expect to get 24 hours. I'll let you know after I live with it for a while
     
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  18. goneskiian

    goneskiian Active Member

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    It is my understanding that when the 12v battery's charge drops low enough it is simply recharged by the main pack.

    I know Inread that somewhere on here. Perhaps someone with more knowledge of how this works will chime in.
     

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