Best Freezer Temperature

Submitted: Thursday, Oct 29, 2009 at 12:03
ThreadID: 73383 Views:30369 Replies:10 FollowUps:11
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Hi Everyone,

Just wondering what temp everyone runs their freezers at whilst travelling. We have a Waeco CF40 that we use as a freezer. We plan to connect to the Thumper at our overnight stops.

At the moment we are running it at home on -18 deg. which is the lowest it goes. Does it need to be that low to safely keep meat frozen and freeze our ice blocks.
Any advice would be very appreciated
Cheers Tony
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Reply By: George_M - Thursday, Oct 29, 2009 at 12:23

Thursday, Oct 29, 2009 at 12:23
G'day Tony

I run my Engle on about -2 degrees. I have a remote thermometer that has a sensor on the end of a wire, and I position the sensor about 10cm from the bottom of the fridge.

We cryovac our meat when travelling, so it stays largely frozen at the bottom. Next comes a layer of tins - they are above the "cold" layer in the fridge and don't blow up! On top we have two trays where we keep margarine, dip and other stuff that likes to stay cool, but not frozen.

Hope this helps.

George
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AnswerID: 389239

Reply By: dbish - Thursday, Oct 29, 2009 at 12:31

Thursday, Oct 29, 2009 at 12:31
Tony I have a waeco CF40 to, if you run it @-18deg it will use a lot more power. If i only want too keep stuf frozen that is frozen when added I set temp to --8 deg, If you want to use it to freeze stuf I use --14deg.
AnswerID: 389242

Reply By: Tenpounder (SA) - Thursday, Oct 29, 2009 at 12:33

Thursday, Oct 29, 2009 at 12:33
Hi there. My reading has told me there's nothing magical about minus 18 degrees C, but it just happens to be the standard. (Years ago, some wise guy decided zero degrees F was a good temperature for a freezer, and that became the standard, which is probably why your Waeco runs down to that level (and perhaps no more!)).
That said, there is a trade off between temperature and storage time, ie a sliding scale. So meat will stay frozen at, say minus 5 degrees, and your ice blocks will (eventually) freeze at that temperature. We aim at minus 10 degrees or better for frozen meat.
There are plenty of lists/bulletins etc on the internet. For example, the food standards websites (Health Depts etc) have them, as do the manufacturers of fridges and cryovac machines.
Try www.vacuseal.com.au you'll see that fresh meat will keep for 8 to 9 days at plus 5 degrees!!
We know from experience that meat in a vacuum pack and held at minus 5 or better keeps for weeks.
One final thought: we often run the fridge flat out while the vehicle is running, and then ease the thermostat on the fridge at night to reduce the load on the batteries. So we may have, say minus 10 or 12 degrees during the day, and up to, perhaps, minus 5 or 6 overnight if the ambient temp is really hot.
Hope this helps.
Kind regards
AnswerID: 389243

Follow Up By: Shaker - Saturday, Oct 31, 2009 at 14:37

Saturday, Oct 31, 2009 at 14:37
Boneless red meat correctly vacuum packed, will keep for around 6 weeks at +4 degrees.
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Reply By: Tony - Thursday, Oct 29, 2009 at 12:43

Thursday, Oct 29, 2009 at 12:43
Thanks everyone, thats really helpful and just the info I was looking for.

We might look at raising the temp overnight whilst its running off the battery.

We will look into Vacuum sealing for times when we are stopped in a remote place for a while but as we are travelling each day and free camping at night to get to 80 mile beach caravan park, we thought we could get away with using the waeco as a freezer. The kids love their chicken and prefer eating it to beef or lamb. Im a bit worried about taking it cryovaced as it could only be used for the first few days on the road.

Thanks
Cheers Tony
AnswerID: 389244

Follow Up By: Tenpounder (SA) - Thursday, Oct 29, 2009 at 12:52

Thursday, Oct 29, 2009 at 12:52
You're welcome, Tony. I am not sure what you mean about only being able to use Cryovac food for the first few days on the road: I've done several trips where I've left home with 10 to 12 days meals cryovaced and frozen at home, and just thawed as needed on the trip. Each time, I've ended up with still frozen, cryovaced food left over. And, of course, the safety factor is that, if the fridge chucks a whatsit, these meals will still hang on for several days at a pinch. We take both raw meat and precooked food (eg chicken casserole or curry or marinated lamb) and add rice or pasta or even Deb plus vegs. This saves space in the fridge.
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Follow Up By: Tony - Thursday, Oct 29, 2009 at 13:40

Thursday, Oct 29, 2009 at 13:40
Hi Chris,

I was refering to the cryovaced chicken on the road. As the kids are big chicken eaters and not overly keen on beef or lamb i thought if we cryovaced the chicken to take it would only be able to be used for the first couple of days before going off ( dont want to risk the little ones tummys on the road)
If you cryovaced chicken raw and then froze it, how long do you reckon you could safely eat it for before needing to chuck it away?
Does it make a diffence if its pre cooked to how long it will keep?

Does pork and fish last a while or is it similar to chicken?

Cheers Tony

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Follow Up By: Dandj - Thursday, Oct 29, 2009 at 13:50

Thursday, Oct 29, 2009 at 13:50
Tony, just a note of caution for those with a 3 way gas/electric fridge, (ours is a Dometic 2453), when running on gas the thermostat seems to effect the fridge temperature more than the freezer temperature, which stays around -18º.

If I was to raise the thermostat setting over night, frozen food would stay frozen but other food in the fridge would get warmer.

Also, to concur with Tenpounder, having the freezer at -18º give you some breathing space in the event of a failure (or in our case running out of gas) before the food thaws. At -5º you would have much less time.
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Follow Up By: Tenpounder (SA) - Thursday, Oct 29, 2009 at 14:38

Thursday, Oct 29, 2009 at 14:38
Tony. I can't instantly find any specifics, but I seem to remember people, and even spurts, saying that fish and chicken may not be as durable as lamb and beef. But it is all relative: if you have a mishap, and say the fridge is deprived of power for a few hours, then you would have to treat thawed raw chicken a bit carefully. But I would have no worries with raw frozen chicken at, say, minus 10 or thereabouts lasting for weeks or longer. Even cool raw chicken (say around zero or plus 3 or 4 degrees) would have to be fine for several days. We tend to use chicken tights fillets (no bones) because they are more compact than, say, chicken quarters. If you have a problem cook them up, if not, leave them raw and frozen.
To give you an idea, last month, we left Adelaide with 12 meat meals for 2 (one meal of raw steaks; the rest precooked casseroles, curries etc.) plus another 6 meals for 2 for some friends who we wre re-stocking at Mount Dare. That whole lot, plus four 1.5 litre ice blocks, were all frozen at home to about minus 14 degrees. The total cold mass was enough to ensure NOTHING thawed in the next two weeks, despite the fridge getting up to around minus 6 at the worst (ambient temp around 40 degrees once or twice, mostly in the thirties in the day time, and down to around 12 overnight.)
I had the thermostat on about setting 2 (OK, I confess its an Engel) over night, and flat out while travelling (about 4 hours only per day). Back in Adelaide 12 days later, we threw away the last three blocks of ice.
Only if the meat thaws will it make a real difference whether you freeze while raw, or cook first. But we play safe, and cook a lot first, just to create a 'secondary safety' margin.
Remember, if you buy a thermometer with a memory, you can review the maximum temp from time to time to make sure you haven't missed anything. Most of the cheap Dick Smith/Jaycar/ Engel models have this.
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Follow Up By: Tenpounder (SA) - Thursday, Oct 29, 2009 at 14:50

Thursday, Oct 29, 2009 at 14:50
PS these last comments all relate to cryovaced meat, not just wrapped meat! Also, I meant chicken thighs not chicken tights!!
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Reply By: Voxson - Thursday, Oct 29, 2009 at 13:47

Thursday, Oct 29, 2009 at 13:47
minus 22 is what my 40litre engel runs at when turned to freezer...
when i am driving most of the day with short stops it will stay between --18 and -22....

ambient heat effects this operation quite a lot...

when i leave the car locked up and the ambient gets to 50 degrees then the freezer struggles to stay above -14....

my iceblocks and frozen dinners,, seafood etc stays perfectly frozen at all times..

my engel draws approx 2.2amps per hour from the battery and my cf40waeco draws approx 5.5amps per hour..
AnswerID: 389250

Reply By: Boobook2 - Thursday, Oct 29, 2009 at 18:08

Thursday, Oct 29, 2009 at 18:08
Keep it at -18. Believe it or not it wont use much more electricity at -18 than at -2 ( but will use 2 - 3 times as much as at +2) It may even use more at -2 as it has to refreeze all the time, which apart from using a lot of electricity, is unsafe. It is better to just cryovac ( at above zero) and not freeze at all IMHO.


At the - 18 setting it will get up to -5 or so with new food. At -2 it will get to +2 to 3. Bacteria city.
AnswerID: 389274

Reply By: Fatso - Thursday, Oct 29, 2009 at 20:38

Thursday, Oct 29, 2009 at 20:38
Hi Tony
How much food do you intend to freeze?
If you are going down the Canning for 21 days it would be advisable to carry probably four weeks food. If on the other hand you will be in a town every few days you can purchase fresh meat then.
Australia is an amazing country with a wonderful food distribution network.
Most towns in SA, Vic, NSW & Qld will have a grocery shop, butcher shop & maybe a baker shop. They will most certainly have a cappuccino machine.
WE bought 14 nights worth of meat in Alice Springs & got home 3 weeks later with 5 nights worth.
Leave plenty of room in your fridge for cold drinks for you, the wifey & kids unless you are going to be isolated for a couple of weeks. Don't forget to put some "happy hour" snacks in as well.
AnswerID: 389296

Reply By: Member - Graham H (QLD) - Thursday, Oct 29, 2009 at 20:46

Thursday, Oct 29, 2009 at 20:46
Weve had our 60ltr Waeco at -10 since February 24/7 and it keeps eveything

in the large compartment frozen whilst leaving the stuff in the small one cold

but not quite frozen.

Spends quite a bit of time in the car or else under the awning.
AnswerID: 389300

Reply By: Member - Gavan F (WA) - Friday, Oct 30, 2009 at 03:15

Friday, Oct 30, 2009 at 03:15
Hi Tony

I have a Waeco CF50 which I run at -11 . Overnight I turn it off and it generaly rises to -8/9 which due to its thermal mass generaly cools down pretty quick once On again with the car travelling or on the Solar Panel when stationary. I run an 80 A/H Aux Battery.and 100W solar panel

I also Vac seal meals and meat etc ..No blood in the bottom of the fridge.!

Gavan
AnswerID: 389350

Reply By: Von Helga - Friday, Oct 30, 2009 at 09:57

Friday, Oct 30, 2009 at 09:57
This is an interesting Question.
I suggest you google your Health authorities websites and look at food Standards as you will find that the recommended temp below freezing is much lower than I would have thought.
Yes the products will still be "frozen" at minus something however, bacteria can still be alive if you don't keep it at the lower temp of Minus 17 deg c
AnswerID: 389387

Follow Up By: Fatso - Friday, Oct 30, 2009 at 16:32

Friday, Oct 30, 2009 at 16:32
To coin the Subway add "EAT FRESH"
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Follow Up By: Tenpounder (SA) - Friday, Oct 30, 2009 at 16:49

Friday, Oct 30, 2009 at 16:49
Hi there Von Helga.
Like I said earlier, zero F has become the yardstick for operating temps for commercial (and by default domestic) freezers. This equates to minus 18 C. But the storage time at temperatures below zero C is a sliding scale, and safe storage periods at, say, minus 10 degrees can be measured, and are published. Croyac vacuum packing adds further by removing much of the oxygen upon which bacteria flourish.
So, while I agree that the higher the storage temperature, the greater the risk of spoilage, I repeat that the safe storage time at say minus 10 degrees will be many weeks (but not perhaps 6 months as per the NSW Health data).
To Fatso: What's your point? Fresh food goes off; the colder it is, the slower. Most of us keep some of our food cold for that reason.
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Follow Up By: Fatso - Saturday, Oct 31, 2009 at 08:38

Saturday, Oct 31, 2009 at 08:38
Fresh is FRESH. If it is rotten it is not FRESH, it is rotten.
Buy fresh & eat fresh.
Like I said ,if you are going to a town every few days you can stock up on fresh milk, fresh vegies & fresh meat. Meat will keep for several days in a fridge. If the fridge you have does not keep meat for at least 4 days you would be well advised to go & buy yourself a TRAILBLAZER. It definately will keep meat fresh longer than 4 days.
For those who don't know,Australian towns are not that remote any more.
You can get a cappuccino, gourmet pies, fresh vegies & a leg of lamb in Birdsville these days.
I did this year.
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Follow Up By: Muddie - Saturday, Oct 31, 2009 at 12:11

Saturday, Oct 31, 2009 at 12:11
Depends which day you arrive in Birdsville, I have been there last year when the pub has only thai slop for dinner and the shop/servo 1 old pumpkin.
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Follow Up By: Shaker - Saturday, Oct 31, 2009 at 14:38

Saturday, Oct 31, 2009 at 14:38
.... and the bakery had sold both the pies!

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