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How to adapt a cheap digital stopwatch / clock to record fridge run time

Discussion in 'General Electronics Discussion' started by Dust bunny, Oct 15, 2012.

  1. Dust bunny

    Dust bunny

    10
    0
    Oct 4, 2012
    My boat refrigerator runs on 12 volts DC. I'd like to adapt a 'cheap' digital clock or stopwatch to time how long the fridge runs for. I wired in a counter that counts how often the compressor starts, but that doesn't really help as I need to know how long it runs each time it comes on and total run time in say, 24 hours.
    I was thinking a digital stopwatch utilizing the lap time counter, but what do you think; is this possible?
    Thanks in advance for your time!
     
  2. CocaCola

    CocaCola

    3,635
    4
    Apr 7, 2012
    Quick and dirty get an analog clock of the proper voltage and wire it parallel to the compressor... Set it for 12:00 and see how much time elapses in a day... You won't get individual run periods but I don't see how that is really all that important if you can average the 24 hour period out... Also ambient temps and the amount of items in the fridge can have a drastic effect on run time... Logging the individual run time is a little more involved, I would do it with a micro but that kinda involved for a newbie...
     
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