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Run pc case fan on cig lighter question

Discussion in 'Technical Chat' started by Caslon, Jul 21, 2021.

  1. Jul 21, 2021 at 8:38 PM
    #1
    Caslon

    Caslon [OP] Well-Known Member

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    Wanting overnight cracked window airflow and not using car fan which would drain battery after 5+ hours. Would this be okay: 80mm high speed pc case fan hooked up to the cig lighter. Fan draws 12v and .13 amps. Can someone here do the math and tell me if that could/would/might prevent my truck starting after about 5-6 hours…or, be fine? I plan to keep the fan wedged by rolling up the window to it. I wouldn’t use radio, etc. I suck at electrical math.
     
    Last edited: Jul 21, 2021
  2. Jul 21, 2021 at 9:31 PM
    #2
    Dm93

    Dm93 Test Don't Guess

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    If you battery is good it shouldn't be an issue, however if your battery is getting weak it may kill it overnight.
    0.13A (130mA) is just over the absolute maximum allowable parasitic draw current of 100mA (ideally should be 50mA or less).
    If your just needing to do it a night or 2 you should be ok if your battery is good but I wouldn't do it on a regular basis without something to keep the battery charged.
    Are you sleeping in the truck or why are you needing to ventilate it at night?
     
    airmax233 and Caslon [OP] like this.
  3. Jul 21, 2021 at 10:56 PM
    #3
    Caslon

    Caslon [OP] Well-Known Member

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    Ya….Sleeping here for the time being. I get what you mean about running it nights in a row and not driving freeway to get battery up to snuff again. Bought a Noco GB40 booster, not worried about a no start. Thanks for the electronics math.

    I’m going to chance it and see if if I need to use my NOCO GB40. Facts is facts, tho. Thanks again for them.
     
    Last edited: Jul 21, 2021
    airmax233 likes this.
  4. Jul 22, 2021 at 4:43 PM
    #4
    HisDad

    HisDad Well-Known Member

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    Maybe the First Gens are different, but I've never seen a Toyota (or any Japanese vehicle) that leaves the cigarette light energized when the engine is off. On my '06 Tundra, I had to jump a relay to get the two "Power Ports" to work with the engine off. Those looked like cigarette lighter ports, but were not rated for the 25 amps required to actually get the cigarette lighter hot enough to, uh, light a cigarette.

    I'd check that before doing anything else.
     
    6 gearT444E likes this.
  5. Jul 22, 2021 at 10:23 PM
    #5
    Caslon

    Caslon [OP] Well-Known Member

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    I'd keep the key in on position, not really the issue.
     
  6. Jul 22, 2021 at 11:02 PM
    #6
    Yettee

    Yettee Well-Known Member

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  7. Jul 22, 2021 at 11:06 PM
    #7
    0xDEADBEEF

    0xDEADBEEF River Trash Aficionado

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    With the key on you’re burning a lot more energy than the fan alone
     
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  8. Jul 22, 2021 at 11:45 PM
    #8
    fatfurious2

    fatfurious2 IG: great_white_taco

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    I thought about this as an option to create airflow when camping. I have a second battery that I would run them off of, so I didnt have to worry about killing the starter battery. But a few people told me that they are loud, and dont move alot of air. The fan linked thats rechargeable is a much better option. And you only need to worry about the battery thats built in. Might even be able to run that off of a portable battery pack, if the internal battery dies.
     
  9. Jul 23, 2021 at 7:21 AM
    #9
    HisDad

    HisDad Well-Known Member

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    Not that bright either, but you be you.

     
    wilcam47 likes this.
  10. Jul 23, 2021 at 7:30 AM
    #10
    MR5X5

    MR5X5 Well-Known Member

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    Amp-Hrs (AH). How many amp-hrs is your battery rated for? Divide that number by 0.13 amps and you have hrs it will last. FWIW 0.13 A ain't nothing.
     
  11. Jul 23, 2021 at 7:34 AM
    #11
    Knute

    Knute Well-Known Member

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    Key on means the entire truck is electrically live.

    Have you considered using a basic window screen cut to fit, then leave the windows open??
     
  12. Jul 23, 2021 at 7:35 AM
    #12
    Knute

    Knute Well-Known Member

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    Need to add the truck's parasitic draw to the 0.13 A.........then do your calculation.
     

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