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Old 08-27-2019, 09:32 PM   #111
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Fill 'er up with water jugs, start out at ambient, open up a few times as you normally would.

If you are measuring energy use off grid, need to include the inverter overhead, the actual draw of DC 12V from a battery bank.

Ah per 24 hours is the key stat.
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Old 08-27-2019, 09:43 PM   #112
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Empty?

Fill 'er up with water jugs, start out at ambient, open up a few times as you normally would.

If you are measuring energy use off grid, need to include the inverter overhead, the actual draw of DC 12V from a battery bank.

Ah per 24 hours is the key stat.
It's got three cases of soda, 10 32oz bottles of gatorade and a six-pack and a couple of other little things, but there were already in there and chilled when I started measuring. I'm going to try a more robust experiment tomorrow like what you describe, and also see what effect a fan on the radiator has.

I'm trying to gradually ease into the electricity stuff while I get the outside of my bus fixed up. I'm thinking I'm going to buy a couple of cheap solar panels and all the other gear and see if I can get my fridge here running completely off solar.
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Old 08-27-2019, 09:52 PM   #113
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Very nice. Any idea what the on off duty cycle is? And what the cut in / cut out temperature of the thermostat. Essentially you are measuring the heat gain of the interior of the fridge versus the outside temperature and then related to the efficiency of your cooling system. For an old freezer like that it seems amazingly good.

The freezing ability...testing how fast it can cool a gallon of water is fun but not that interesting unless you define what the surface area of the water is versus the air circulation inside the fridge... Water in ice cube tray will freeze faster then the same amount of water in a plastic bag.

John is right with the inverter losses. Especially the standby losses depending on your inverter.

But at least it is a very promising number to start with.
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Old 09-11-2019, 06:46 PM   #114
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What about this one? Is this a desireable model? It's a Norcold SB70.
https://oregoncoast.craigslist.org/r...972388160.html
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Old 09-11-2019, 06:55 PM   #115
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What about this one? Is this a desireable model? It's a Norcold SB70.
https://oregoncoast.craigslist.org/r...972388160.html
That looks like a pretty good deal. It is kind of small though. I went to a 10.8 cf refrigerator some years ago and can't go back to a smaller fridge. Wife won't let me
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Old 09-11-2019, 08:30 PM   #116
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Thanks, yeah, that does seem small. The measurements the seller gives work out to 5.6 cubic feet, but it's not clear whether those dimensions are inside or outside. But it's just me and my dog and as long as he has plenty of bones, he'll be fine.

My problem is that it's well over a week until payday, and I've already put about 110 percent of my disposable income into the bus project. If it's still for sale then I might take a drive. It's about 35 miles.
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Old 09-11-2019, 10:37 PM   #117
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I finally had time to sit down, and found that CL ad for the fridge came word for word from Amazon. The dimensions given are the same, 20X23X21, but amazon calls it 2 cubic feet. That's ridiculously small even for just me and my dog.
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Old 09-11-2019, 10:52 PM   #118
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I finally had time to sit down, and found that CL ad for the fridge came word for word from Amazon. The dimensions given are the same, 20X23X21, but amazon calls it 2 cubic feet. That's ridiculously small even for just me and my dog.
Maybe don't keep your dog in the fridge?
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Old 09-11-2019, 11:54 PM   #119
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He weighs about 100 lbs. I don't think he'll fit in that fridge. He doesn't think much of people who want to put him in a cage or a box. Can't say as I blame him.
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