Watts cost


Old 12-18-05, 06:29 PM
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Watts cost

Trying to figure out how much it costs to have 2 - 100 watt bulbs on 24/7 for 28 days. I looked around the web and simply got more confused. My kwh cost is .070806 now here is my quess 200 watts (joules) per second divided by voltage of 120 = 1.66 now times 60 = 99.6 per hour times 24 hrs = 2390.4 times 28 days equals 66931.22 now divided by 1000 = 66.93 kwh times cost of .070806 = about $4.73 per 28 day period to keep two 100 watt bulbs burning, Is that right??????????????
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Old 12-18-05, 06:44 PM
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You are billed for watt-hours. You are billed 0.070806 per 1000 watt-hour.
200 watt load times 24 hours times 28 days = 134400 watt-hours.
Since you are billed at 0.070806 per 1000 watt-hour, then your bill would be $9.51
Old 12-18-05, 06:52 PM
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thanks handyron that is a pretty brutal amount to keep a server running full time I see how it is figured now, I was making it a lot more complicated than it needed to be.
Old 12-19-05, 04:52 PM
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HandyRon is right but if you want an online calculator here is one.

Old 12-19-05, 07:56 PM
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Note that the power supply is probably rated to put out 200 watts (max), not to use 200 watts.

Also understand that when you aren't using 200 watts of power the input power goes down as well. The only way to get an accurate picture would be to use a meter and measure the power for some representative period of time and then multiply.
Old 12-20-05, 12:45 PM
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And check your bill carefully to figure out whether .070806 is the total cost of a KWH. Sometimes there is more than one line item on the bill where the cost is proportional to KWH used (e.g., the might charge separately for the cost of the energy itself, and the delivering the energy to you). Energy companies like to issue confusing bills to hide the real costs.
Old 12-20-05, 01:32 PM
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I'm using a Belkin 1100va backup power supply. It's monitoring software indicates ouput power usage at 11% off hours to 25% during the work day. The difference appears to be the monitor which is turned off at night. The average is about 18% (close to 200 watts). We have 10 systems like this and we keep all systems on 24/7. Based on the rate quoted above, that could cost as much as $95 per month. Our rate is fortunately much better.

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