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Old 01-10-2014, 02:15 AM   #31
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......I put my energy monitor on it and it's going to cost me nearly $500 / year in electricity to use this fridge (at $0.15/kwh)!!! It's averaging 350 watts / 3 amps over 48 hours of use. I do hear the compressor cycling on and off, but it's running most of the time, I'd say 80%+.....
I'm not completely sure of the calculations you have made. Is this it basically? 350x24 = 8.4KWH/day @$0.15/KWH would result in $459/year ?

The compressor is rated at 115VAC/4.4A which is about 500watts when running and the evaporator fan is rated at 9watts which runs all the time. Therefore, during your monitoring the compressor consumed 340watts on average, so it ran about 68% of the time, 340/500.

The manufacturer claims energy consumption of 2.08KWH per day, or an average of 86watts continuous. This represents about a 17% run time and would be about $115 per year at $0.15/KWH. Of course that figure is best case test results.

Still, I'm not sure why your measurements would be so different from the manufacturers. Either the unit is not operating correctly or an unloaded unit consumes 3-4 times the energy of a perfectly operating/filled unit.
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Old 01-10-2014, 01:40 PM   #32
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I'm not completely sure of the calculations you have made. Is this it basically? 350x24 = 8.4KWH/day @$0.15/KWH would result in $459/year ?
I have a power meter that calculates the cost per year for me. I left it running for more than 48 hours (after it had been on for a few days, too, so it wasn't just some initial startup running or anthing) and that's where I got the numbers.

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Still, I'm not sure why your measurements would be so different from the manufacturers. Either the unit is not operating correctly or an unloaded unit consumes 3-4 times the energy of a perfectly operating/filled unit.
I don't think a freezer empty would use more electricity anyhow - more airflow means it should run more efficiently and theoretically cost less.
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Old 01-10-2014, 02:13 PM   #33
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I have a power meter that calculates the cost per year for me. I left it running for more than 48 hours (after it had been on for a few days, too, so it wasn't just some initial startup running or anthing) and that's where I got the numbers......
But the cooler was empty, correct?

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......I don't think a freezer empty would use more electricity anyhow - more airflow means it should run more efficiently and theoretically cost less.
I disagree. A refrigerator or freezer is designed to operate with a load. I don't think it's about airflow, but a measure of the resistance to heat conduction/loss, thermal resistivity might be a way to describe it, of the items in the unit. Air would have very poor thermal resistivity while the solids or liquids being refrigerated have higher thermal resistivity. The items in the unit function as cold sinks that resist the absorption of heat. Once they are at the target temperature, it takes little energy to keep them there. But then again, maybe I'm wrong.
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Old 01-10-2014, 11:32 PM   #34
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But the cooler was empty, correct?

I disagree. A refrigerator or freezer is designed to operate with a load. I don't think it's about airflow, but a measure of the resistance to heat conduction/loss, thermal resistivity might be a way to describe it, of the items in the unit. Air would have very poor thermal resistivity while the solids or liquids being refrigerated have higher thermal resistivity. The items in the unit function as cold sinks that resist the absorption of heat. Once they are at the target temperature, it takes little energy to keep them there. But then again, maybe I'm wrong.
Yes, they are designed to run WITH a thermal mass factor other wise they lose a lot opening/closing and quite a bit during defrost.
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Old 01-11-2014, 03:18 PM   #35
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Fair enough.

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Old 02-20-2014, 01:04 PM   #36
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Bumping this with a link to my thread asking about the hinge mechanism and possibility of building a collar on the GDM 26 true cooler.

http://www.homebrewtalk.com/f11/true-gdm-26-display-cooler-460934/#post5925538

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