Fridge/Freezer power consumption analysis

karma_mechanic

I got the two pack of these ones:

Wireless Thermometer Hygrometer, ORIA Mini Bluetooth 5.0 Humidity Temperature Sensor with Data Export and Alerts for iOS Android (2 Packs) https://amzn.eu/d/hvjXQiq

No display, just a tiny puck. So far I've had one in the freezer for a few days, one in various places in the fridge (bottom drawer, top door shelf etc) and also in the living room. 

It has showed that the freezer ticks along on -18 give or take half a degree, and the fridge has a sawtooth shape that bumps along at 3.5 +/- 0.5 or 4.5 +/- 0.5 depending on location. Inside the egg box on the top of the door is by far the warmest, hitting a peak of 7.

They read OK on the phone even from the inside of the freezer and the battery on the coldest one showed one bar less after three days at -18. The logging seems to be endless on the phone, but is apparently for 100 days.

Thoroughly recommended.

*** Edited now to put in link and correct the fridge temps.

Chrysalis

-21.6C is current reading, I also compared it to two other thermometers at room temp and seems accurate.

So seems my freezer is fairly consistently about 4C below what I set it to, so I guess now I know the reason they havent put live temperature on the built in display?

Will set it to -14C and see if it moves to -18C.  But am a little paranoid these sensors are wrong and then I damage my food.

Chrysalis

Qyburn said:

Chrysalis said:

The -50c is this one, but bear in mind it seized up at -22c.

https://www.amazon.co.uk/dp/B09294VXP9

Cheers. Unless I miss something it's not Bluetooth, which i liked the idea of for monitoring during a power cut when obviously you don't want to keep opening the door.

Yeah its got no app or anything.

Chrysalis

Recently learnt there is ambient temp range's for fridge freezers to work in, might be common knowledge but I didnt know.

According to this website the normal range requires 16C which to me seems quite high.

I checked my unit and luckily its the sub normal class and only requires 10C.

https://www.ukwhitegoods.co.uk/buying-advice/installation-advice/2793-fridges-a-freezers-in-garages-or-outhouses/

MultiFuelBurner

And then add in the variation that no two fridge freezers are built the same and kerpow mind blown.

Happy with the temps we have set on out LCD and it hasn't killed us yet in the past two years.

Chrysalis

The device that was posted on here, also went off in the freezer so took it out.

Then about an hour later I heard a ticking noise and I couldnt figure out what it was, then eventually I noticed it was the thermometer I had removed, the screen was back on but it was ticking, I picked it up and some faint beeps started, then it appeared to go through some kind of reset/reboot and it was then silent and seems to be working normally again.

So it seems if I want long term monitoring in my freezer I will need to go with sensors on a wire.

Meanwhile my fridge has become quite erratic, I seen it as high as 6.5C and as low as a little above 2C.  But that does get opened more than the freezer so perhaps can explain it going up occasionally, but I do feel the freezer is consistently below its target temperature by about 4C.