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How long does a freezer stay frozen when the power goes out?

woodgears.ca

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Re: How long does a freezer stay frozen when the power goes out?

#281
post #182

A simple way to detect power failure induced thawing in a freezer is to store a paper cup about half full of frozen water in the freezer. By keeping a coin on top of the ice it’s easy to see with a quick glance if the temperature has risen for an extended period of time (possibly due to a temporary power failure or the door not being fully closed).

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Re: How long does a freezer stay frozen when the power goes out?

#282
post #220

Earlier quoted context omitted.

Freshly downed live trees aren't great for firewood. The moisture content tends to make the wood difficult to light (if you can't spare lighter fluid, diesel, gasoline, candles, etc.) and it tends to produce a lot of smoke once lit. I've done enough camping that I can get wet wood burning if I have enough dry twigs, dry pine needles, birch bark, etc., but if your only experience with starting fires is pouring lighter…

And anything used in construction has been heavily treated to resist water damage, so I wouldn't want to be near those fumes, let alone eat something cooked from them.

It may be OK after the smoke clears. Rookies who have never used a real charcoal BBQ don't know when the coals are ready and start cooking too soon. You cook when it seems like it's too late the coals are ash but that's the time to do it.

Re: How long does a freezer stay frozen when the power goes out?

#283
post #182

A simple way to detect power failure induced thawing in a freezer is to store a paper cup about half full of frozen water in the freezer. By keeping a coin on top of the ice it’s easy to see with a quick glance if the temperature has risen for an extended period of time (possibly due to a temporary power failure or the door not being fully closed).

Another idea I’ve used while on vacation. Get a plastic bottle, fill it maybe 1/4 to 1/2 with water, freeze it, then before leaving turn it upside down. If the ice stays at the bottom of the bottle when you get back you should be all good.

Re: How long does a freezer stay frozen when the power goes out?

#284
post #131

The location of the freezer or refrigerator is critical. If you live in a house that has a typical unfinished basement, don't overlook the advantage it offers. With one simple change, you can noticeably lower your electric bill, reduce your carbon footprint, gain extra kitchen space and improve your health. Just move your refrigerator to the basement. Since the basement is normally cooler than the upstairs, the refri…

From what i'v read, freezers are designed to be placed in ambient temperature greater than +10C. There are specificially designed freezers that can withstand up to -15C ambient temp: https://home.liebherr.com/en/lva/products/household-applianc... A guy on the phone that sells used freezers told me that compressor has some liquid that gets thicker when temperature drops below X and compressor has to work harder. The o…

I have a Beko upright freezer that the documentation states is fine until -10C. Probably around half the price of a similar Liebherr.

Re: How long does a freezer stay frozen when the power goes out?

#285

Hi. Actualexperience here... it depends on the ambient temperature and how much stuff is in said freezer. So heres a data point: Freezer: normal upper level refrigerator freezer chock full of frozen fish caught on holiday in Alaska. Place, Time: Houston, TX, Late Summer, Hurricane Igor just hit and knocked our power out for 14 days. Findings: We kept the freezer shut and at about 4-5 days the fish was noticeably thaw…

PSA: I've worked disaster relief/reconstruction in Houston, New Orleans, and a few other places. If you come across a fridge with the doors taped shut DO NOT OPEN IT. If you come home after power was lost for more than a day or so, TAPE THE DOORS OF YOUR FRIDGE SHUT AND DO NOT OPEN IT.

It's not worth it. You will never make the fridge use-able again.

If you have to leave ahead of a disaster, consider emptying your fridges/freezer and propping the doors open.

Obviously this advice is strongest in warm areas.

Re: How long does a freezer stay frozen when the power goes out?

#286
post #255
post #182

A simple way to detect power failure induced thawing in a freezer is to store a paper cup about half full of frozen water in the freezer. By keeping a coin on top of the ice it’s easy to see with a quick glance if the temperature has risen for an extended period of time (possibly due to a temporary power failure or the door not being fully closed).

It is possible for the Ice to partially melt and the coin to not sink, the ice would need to COMPLETELY melt before this test would work, given the nature of ice it is possible for food to raise to an unsafe temperature while the ice is still melting This "trick" should not be used in place of proper temperature monitoring

I usually just put the cup upside down in a small container. If there's any melting the water will collect in the container.

Another poster said use an upside down water bottle, which sounds like an even better option.

Re: How long does a freezer stay frozen when the power goes out?

#287

Related but tangential anecdote: When we went on our honeymoon my mother in law came around and left our freezer full of delicious meat, fish all sorts. But then inexplicably turned off the freezer electricity switch on her way out. 2 weeks later my little sister cane around to leave us some milk in the fridge for our return. Only to find the entire kitchen wreaking of rotting meat and water and other crap all over t…

You had your freezer on a switched outlet?

Re: How long does a freezer stay frozen when the power goes out?

#288
Thawed vs unthawed isn't a bool. You're really interested in the long-term safety of the food, and that starts to decrease as temperatures start to increase.

-18C/0F is the point at which most pathogens are forced to hibernate and bacterial cultures stop growing. But they don't die, and they'll start to revive at higher temperatures - which means they'll begin to spread if there's a regular thaw/freeze cycle, even in a freezer that spends some of its time at -18C/0F.

Re: How long does a freezer stay frozen when the power goes out?

#289
post #267

Earlier quoted context omitted.

Yea so a few things he pointed out in this write up were readily observable. For example, the air falling out of the freezer is actually quite visible when hitting a hot humid ambient air. Also you could see the rate of defrosting accelerate everytime you opened the door. By the time we were able to find a gas station with dry ice we were out looking for open wal marts at a 73 mile radius from the house (Columbus Tex…

Interesting point I'd never considered until this thread... Why not tip the freezer / fridge onto its back? So that doors open "up"? Aware they're typically not perfectly flat on the rear face, but close enough you could support it with minimal work. And if it's unpowered, there's no need for clearance back there.

On the one hand that would assist with the immediate problem but might cause another problem down the line. Most small refrigerated appliances use hermetically sealed compressors and you’re actually supposed to wait a bit 24hrs ish before starting them to allow the oil in the system to drain back to where it belongs. So theoretically after the power came back on and you flip it back upright you should wait to turn it back on. In reality, lots of people move freezers and fridges and window a/c units and plug them back in and use them right away with no problem. But it is possible that you might severely shorten the life of your equipment too.

Re: How long does a freezer stay frozen when the power goes out?

#290
The temp curves may be non-linear, so I'm not convinced about the extrapolation from just a few hours.

I get not wanting to spoil food -- but why didn't he try with, say, jugs of water? Easy way to fill the freezer, great thermal mass, and probably a decent approximation of freezable goods.

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