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Inverter fan always running now.

Discussion in 'Power Electronics' started by AprilSteel, Oct 12, 2019.

  1. AprilSteel

    AprilSteel

    111
    9
    Feb 2, 2017
    I have a generic chinese type inverter of 1000 watts .It started to turn the fans on all the time even when completely cold . They seem to be going full pelt.
    Looking inside I see a thermistor on the heatsink a 100K type and I'm wondering how to test it in situ.

    I was thinking of maybe cutting one leg and see if it stops first. Can always solder it back together.
    While cut I could try a new replacement across the present one.
    Will this be safe to do ? Will I be likely to blow anything doing it.
    Is there a better way?
    Thanks in advance
     
  2. thedoc298

    thedoc298

    8
    0
    Oct 4, 2019
    Sounds like what I would do without a second thought. Does the inverter run ok besides this, if so, you probabbly nailed it.
     
  3. AprilSteel

    AprilSteel

    111
    9
    Feb 2, 2017
    Yep inverter seems fine . I ordered some new thermistors and while I wait instea d of letting the fans run full bore I cobbled up a buck converter 24 V to 12 V and put a temperature board on it . Cut one of the fan lines and put it on the relay . Now I can set the on, off, and wait for parts . It cost me about $6 all up for both boards . $1.10 for the buck converter 2 amps. Bloody amazingly cheap . Probe hot glued over output mosfets

    smallIMG_20191017_181507.jpg
     
    Last edited: Oct 17, 2019 at 11:04 AM
  4. thedoc298

    thedoc298

    8
    0
    Oct 4, 2019
    so cool
     
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