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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.

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  1. Dust bunny

    Dust bunny

    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


    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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