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Our compressor driven fridge is very efficient.  We have a serious 'first world' problem in that if we run it for more than 30 mins, the beers freeze.  I am after a simple timer so we can turn the fridge on and after a set time it will turn off.  Anyone have a simple solution?  

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31 minutes ago, Clipper said:

Our compressor driven fridge is very efficient.  We have a serious 'first world' problem in that if we run it for more than 30 mins, the beers freeze.  I am after a simple timer so we can turn the fridge on and after a set time it will turn off.  Anyone have a simple solution?  

https://www.12voltplanet.co.uk/adjustable-delay-timer-relay-delay-on-or-off-12v-10a.html

I would put that across in the existing circuit and install a 3 position toggle switch circuit to start it, I would add a bypass as the third position so I could run for longer than the timer if I wanted. And I would add a light so I knew the compressor was running.... 

 

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Why not use a temp controller? Then you can leave it on, and it will switch in and out to stay in the programmed range.

see https://www.amazon.com/Inkbird-ITC-1000F-Temperature-Controller-Fahrenheit/dp/B07R46D44T/ref=sr_1_6?dchild=1&keywords=12v+temperature+controller+Celsius&qid=1600579290&sr=8-6

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21 minutes ago, Island Time said:

Why not use a temp controller? Then you can leave it on, and it will switch in and out to stay in the programmed range.

see https://www.amazon.com/Inkbird-ITC-1000F-Temperature-Controller-Fahrenheit/dp/B07R46D44T/ref=sr_1_6?dchild=1&keywords=12v+temperature+controller+Celsius&qid=1600579290&sr=8-6

Because Fridge only runs when engine does, dont mind it getting 'too cold' during that time. Trial and error has shown about 30 mins does what we need to keep it the 'right' temp.

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1 hour ago, CarpeDiem said:

https://www.12voltplanet.co.uk/adjustable-delay-timer-relay-delay-on-or-off-12v-10a.html

I would put that across in the existing circuit and install a 3 position toggle switch circuit to start it, I would add a bypass as the third position so I could run for longer than the timer if I wanted. And I would add a light so I knew the compressor was running.... 

 

Those are all good ideas, thanks!

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So? Make the Temp controller switched on by ignition switch, and by fridge switch. Then, when the engine is on, AND the fridge is on, then the compressor will go if the fridge is not fully cold. Completely automated, nothing to remember. 

The other thing is, its only fully cold if the eutectic fluid in the tanks is frozen. For the best hold over, it needs to change state, this holds much more energy. If you are only using it as a fridge, it should have different fluid mix than if its a freezer. Then you get max hold over time before it needs to run again.

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