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Old 06-16-2010, 10:04 PM   #1
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How Much is this Costing Me??


I have a small minifridge in my garage under my workbench that I use for beer and waters for when I'm out working on the hotrod. The sticker on the back of the fridge says it draws 1.2 amps.

Can you folks look at my math and correct me if I'm wrong in my assumptions or methodology.

1.2A * 120V = 144 watts

144 watts * 12 hours (not sure how often it runs but it is quite warm in the garage) * 30 days = 52 kWh

52kWh * $0.12/kWh = $6.24/month

Does this sound correct? I'm just trying to evaluate whether or not it is worth keeping plugged in.

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Old 06-16-2010, 10:10 PM   #2
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Refrigerators rarely run more than 20 percent of the time, even in a warm garage. Other than that, calcs are fine.
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Old 06-16-2010, 10:21 PM   #3
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My fairly new 26 cu ft fridge is rated to use under $100 of electric a year

I'd say yours is using much less



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Old 06-16-2010, 10:29 PM   #4
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your calculations are assuming the fridge runs 100%
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Old 06-16-2010, 10:57 PM   #5
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I wasn't sure exactly how much it runs, so I used 12 hours a day to be conservative.

So, if I use 20% instead of 12 hours/day, it ends up being $2.50 a month or $30/yr. That seems well worth it to me!!! What do you think??

The reason I asked is because my friend was trying to say it was costing me $25 a month to run.

Thanks for the input fellas!
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Old 06-16-2010, 11:03 PM   #6
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Quote:
Originally Posted by LyonsElecSupply View Post
your calculations are assuming the fridge runs 100%
I assumed 12 hr a day. But I guess thats a bit much. 20% is probably a more realistic number thanks!
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Old 06-17-2010, 06:13 AM   #7
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$30 a year to keep the beer cold is a super deal!!!!!!!
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Old 06-17-2010, 06:55 AM   #8
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There are products like the kill-a-watt that actually measure consumption over time (electrical, not beer consumption!) just plug one if those in for a week or two and you'll have real numbers to play with. One warning though... Once you've got one you'll want to measure the world! My family is ready to kill me for measuring just about everything! :-)
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Old 06-17-2010, 07:03 AM   #9
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Quote:
Originally Posted by jbfan View Post
$30 a year to keep the beer cold is a super deal!!!!!!!

Depending on how the frig is built, you may be able to help it a little. If it has the condenser coils on the back, add some additional insulation around the sides. If the coils are built into the sidewalls then you can't do this.
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Old 06-17-2010, 08:08 AM   #10
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Quote:
Originally Posted by mopowers View Post
So, if I use 20% instead of 12 hours/day, it ends up being $2.50 a month or $30/yr. That seems well worth it to me!!! What do you think??

The reason I asked is because my friend was trying to say it was costing me $25 a month to run.

Thanks for the input fellas!
Your friend is clueless
My 26 cu ft fridge doesn't use $25 a month

I think you could leave the door open & run it 100% & it would not use $25 a month



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Old 06-17-2010, 08:10 AM   #11
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Quote:
Originally Posted by WaldenL View Post
There are products like the kill-a-watt that actually measure consumption over time (electrical, not beer consumption!) just plug one if those in for a week or two and you'll have real numbers to play with. One warning though... Once you've got one you'll want to measure the world! My family is ready to kill me for measuring just about everything! :-)
Yup, got one a few years ago and I am STILL using it To the OP, I pay $0.22/kWh which is almost twice what you pay. I plugged my main fridge into a Kill-A-Watt and measured it for a month. End result was, the main fridge in my house uses $6.80/month. It's energy star yes, but also in a cove so heat dissipation isn't ideal and being opened/shut frequently all day. If my main fridge at nearly twice the price per kWh is only $6.80/month I think your $2.50 is far more accurate for a small unit that's not opened/closed too much... probably even less.

The big hitters in my house are the AC (running on powersave 24/7 cost is $68/month), De-Humidifier (in basement, average cost is $31/month in summer), and dryer (it's 240v I can't measure, but I think mine costs $1-2 each drying cycle. After having a baby and doing cloth diapers which require daily washing & drying our electric bill more than doubled and it isn't the washing machine). The big surprises was the washing machine, according to the kill-a-watt costs a little over a penny per load. Now I do laundry more often, and try to air dry.

You should pick yourself up a Kill-A-Watt too. http://www.amazon.com/P3-Internation.../dp/B000RGF29Q you tell it what price you pay for kW, plug the device into it, and it will tell you exactly how much so far, per week, per month, per year that device should cost... and the longer you leave it plugged in and measuring (for items that kick on/off like a fridge) the more accurate. It's fun to see exactly what's going on, and not so expensive you'll break the bank. I don't know why, but the only thing mine won't measure is our microwave, turn on the microwave and ERR displays on the screen until the microwave shuts off. Has no problems with anything else.

Last edited by Piedmont; 06-17-2010 at 08:34 AM.
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