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We have not studied the on/off timing cycles of the fridge but, naturally, that will depend a lot on external temperature and how often the fridge is opened. I would expect that the temperature driven controller would be more accurate than an external timer. We have checked the internal temperature with another max/min thermometer and found it to be very stable.
I don’t know if switching on and off very frequently going to do any harm to the pump and does it boost the power bill. I just don’t know.
Since the external temperature controller is keeping the fridge at a higher temperature (11C) than the internal thermostat (4C), it would seem to me that the fridge is working less hard to maintain the 11C temperature as there is a smaller difference between the surrounding air temperature and the desired internal temperature. This would imply that it is also turning on and off less frequently and, significantly, also using less power as it is doing less work.
Murray BE (Elect), DipPHE (Christine’s husband)
There is a simpler device available if you are in NZ or Aus.
No wiring required – plug and play!
I have just ordered on so will post a photo of mine in-situ when it arrives in a week or so
Take a photo – make sure it is not too big then click on the “Choose File” button at the bottom of the Post area and select your photo as the file to attach.