Fridge/Freezer power consumption analysis

Netexporter

5 degrees is cold enough.

Qyburn

mmmmikey said:

Hi, if anyone has the temperature sensors I linked to earlier, it's worth knowing that on one of mine the display goes blank because of the cold, but the Bluetooth still works and I can see both the live and historic temperatures on the smart phone app.

Mine's just dropped dead, no display and no response on Bluetooth. It came to life after warming it to room temperature, now popped it back to see how long that lasts. 

Chrysalis

Qyburn said:

mmmmikey said:

Hi, if anyone has the temperature sensors I linked to earlier, it's worth knowing that on one of mine the display goes blank because of the cold, but the Bluetooth still works and I can see both the live and historic temperatures on the smart phone app.

Mine's just dropped dead, no display and no response on Bluetooth. It came to life after warming it to room temperature, now popped it back to see how long that lasts. 

Same issue then

Mine has arrived today, just not put it in freezer yet.  Mainly I want to see if it correlates with the other at -22C.  If it does i might give hisense a call to check the freezer thermostat.

mmmmikey

Hi @Qyburn and @Chrysalis - hope I haven't made a bad recommendation here and please accept my apologies if that's the case. I have 2 of these, I used one in the freezer and one in the fridge, and they happily worked for 3 months or so, with the "only" issue being the blank display on the freezer one. I stopped using them after 3 months because by then I had all the data I needed. Makes me wonder if I was just lucky. Fingers crossed you get them working and sorry again if I gave you a bad steer <this space left blank for hanging my head in shame icon>

Qyburn

mmmmikey said:

Hi @Qyburn and @Chrysalis - hope I haven't made a bad recommendation here and please accept my apologies if that's the case. 

Don't worry on that score. I suspect the battery. Some brands of CR2447 give operating temperature down to -20 Deg.C, which is obviously on the limit in a freezer. Panasonic quote down to -30, and I'm sure I saw one that said -40 but I cant find it now.

https://docs.rs-online.com/0fa3/0900766b8061c9cd.pdf

The supplied battery was marked CR2447T and I've seen references to that but nothing explaing the difference, if any. 

Qyburn

Chrysalis said:

New device arriving tomorrow.  This was one rated for -50C lol.

Which device is this?

Chrysalis

Qyburn said:

Chrysalis said:

New device arriving tomorrow.  This was one rated for -50C lol.

Which device is this?

I have the same as you now.  But still not put it in there.

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

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

Chrysalis

mmmmikey said:

Hi @Qyburn and @Chrysalis - hope I haven't made a bad recommendation here and please accept my apologies if that's the case. I have 2 of these, I used one in the freezer and one in the fridge, and they happily worked for 3 months or so, with the "only" issue being the blank display on the freezer one. I stopped using them after 3 months because by then I had all the data I needed. Makes me wonder if I was just lucky. Fingers crossed you get them working and sorry again if I gave you a bad steer <this space left blank for hanging my head in shame icon>

No worries, its still useful even if it only works for a day at a time.

Qyburn

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.

Alnat1

I'm keeping an eye on this thread, I'd like to have some way of monitoring my fridge remotely and need something reliable. Please keep reporting on how they all work.

I've got a 12 year old themo/probe type device, with the wire that goes through the seal, the display part magnetically sticks to (often falls off) the outside of the fridge. I use it to check the temperature of my hibernating tortoises who are snoozing in there until spring. If the alarm went off, fridge is in the integral garage so might go unnoticed for a while.