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Old 02-24-2009, 03:36 PM   #11
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The math is pretty easy to figure out. To convert your electricity usage to kilowatt hours you are looking at two things, the amount of watts, and the amount of time they are running.

If you're lighting is 50w on 12 hours a day that = 50w * 12h * 30d = 18000 watt hours, or 18 kw hours in one month.

Do the same thing for each item you have that draws power, multiply the wattage x the hours used in a day x 30 days in a month. Then, add all KWH up and multiply by the rate your power company charges. You will have to look at multiple portions of the bill depending on where you live, and some may be more complicated than others. In either case, once you find the $ / killowatt hour just multiply that by your kwh answer and you have your monthly cost.

Heres an example:

Pumps = 30w X 24 hours x 30 days = 21.6kwh
Lights = 100w x 12 hours x 30 days = 36kwh

The heater can be tricky because you would need to figure out how much it is actually running, you may want to check your owners manual to see if it is thermostat controlled or if it runs continuously. Assuming your heater is not continuously running and only kicks on when the temperature dips below a certain point, you would really have to estimate based on room temp. and desired water temp. Once again, the owners manual of the heater might help you with this. As a safe bet, I would say:

Heater = 200w x 12 hours x 30 days = 72kwh

Adding them all up: Total KWH Usage = 21.6 + 36 + 72 = 129.6 kwh / one month.

Now just take a look at your electric bill and multiply. Where I live, we pay somewhere around 21c / kwh after all the generation, distribution charges, taxes, fees, etc... etc... The good news is, unless you live in Hawaii, I guarantee you pay less than that in the US.

Anyways.... 0.21 * 129.6 = $27.21 a month.


Hope that helps some of you!
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Old 02-24-2009, 03:43 PM   #12
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wow... very descriptive thank you... im gonna check wattages when i get home and start doing some math
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Old 02-24-2009, 03:45 PM   #13
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Cliff Notes Version:

Total KWH / Month For each Item = Watts X Hours a Day X 30 days

Add up all the KWH Values and multiply by the rate your electric company charges. In CT it's around $0.21 / KWH.... almost every other state is cheaper. (Some significantly)

You final result will be a typical cost per month. You can do this formula for anything in your house....television, stereos, whatever. It's sometimes good to think about how much money it actually costs you.
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Old 02-24-2009, 04:01 PM   #14
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good Lord, lol. I pay $0.09/kw where I live.... That's outrageous! Of course, my electricity is provided through a co-op. But evn in Houston, I think it averages around $0.16 or so.

It's $.06 for the juice, and $.03 for the delivery . $10 monthly svc charge...that's it.
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Old 02-24-2009, 04:09 PM   #15
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Originally Posted by nanoluvr View Post
good Lord, lol. I pay $0.09/kw where I live.... That's outrageous! Of course, my electricity is provided through a co-op. But evn in Houston, I think it averages around $0.16 or so.

It's $.06 for the juice, and $.03 for the delivery . $10 monthly svc charge...that's it.

Yeah we pay a lot...second highest in the nation to Hawaii. Theres a lot of reasons for it...mostly due to a backwards partial deregulated scheme. I happen to work for the electric company here, we don't generate our own electricity, we just distribute it. (We install and maintain, the poles wires, substations, etc... and we purchase the electricity from generating companies) The generating companyies charge around 12c right now per KWH, it makes up more than half of the total cost of electricity, and it's a total racket. It's really quite a mess right now and it causes a lot of problems for my company, one of which being public outrage at the cost, they blame us even though we have no control over the generation cost. Before deregulation, we generated electricity at 7c. Hooray politicians, they still refuse to admit they made a mistake.
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Old 02-24-2009, 04:10 PM   #16
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Quote:
Originally Posted by nanoluvr View Post
good Lord, lol. I pay $0.09/kw where I live.... That's outrageous! Of course, my electricity is provided through a co-op. But evn in Houston, I think it averages around $0.16 or so.

It's $.06 for the juice, and $.03 for the delivery . $10 monthly svc charge...that's it.
I work for a Co-op in west texas.

Generation costs for electricity in 2008 were horrid, mostly due to natural gas prices!


Your rates are a much cheaper than most companies in Texas~!
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Old 02-24-2009, 04:13 PM   #17
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I'm the SHECO..Sam Houston Elec. Co-op
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Old 02-24-2009, 04:15 PM   #18
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Quote:
Originally Posted by littlerob904 View Post
Hooray politicians, they still refuse to admit they made a mistake.

I hear ya...friggin buggers
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Old 02-24-2009, 05:05 PM   #19
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Here's a spreadsheet I created to calculate electricty cost.

Anyone can change it and I can't lock the cells... So please only change numbers in blue. The rest of the cells are formulas... so any changes to black numbers will screw up the spreadsheet.

Good luck! My cost for one tank is $19.09 a month.


http://spreadsheets.google.com/ccc?k...e7JLpuUw&hl=en
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Old 02-24-2009, 05:18 PM   #20
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*cringes*... im running 9 150 watt lights for 12 hours... a 300 watt rack heater for 24 hours and 8 black lights at 100 watts for 12-24 hours.... thats without aquariums.... im leaving this thread

-Brad
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