ok electricity math question

raggie33 · May 30, 2004

ok i pay 7.8 cents per kilowatt hour i have a ac that uses 620 watts.so say my unit stays on 24 hours per day. i figure my bill will be like 40 per month on ac unit?i say 24 hours a day to be safe. i dont run heat in winter but i do run ac in winter.also if any one can tell me how to figure it out easly it sure will help

nisshin · May 30, 2004

I may be wrong but ...
0.078 $/kw-h * 0.620 kw * 24 h/day * 30 day/month
= $34.82/month

(Of course this assumes the AC unit is running at the full 620 watts all the time.)

PhotonBoy · May 30, 2004

0.62 kw * 24 hrs * 30 days* $0.078 = $34.8192

Don't you mean ac in summer?

raggie33 · May 30, 2004

thank you . i always like to know what it will cost yeah opps summer lol not winter thank you for formula it should be cheaper then that they have a weird rate it changes like less then 350 kw its one rate then next 650 it is another,then over 1000 a another but i want worst case .this has been one nice window unit it does a fine job.it is so hot in southern ga in the day time but at night im sure compreser only comes on for a minute or so

PhotonBoy · May 30, 2004

Here in Nova Scotia, it doesn't make sense to have an air conditioner. Today's termperature forecast is 9C or 48F (max!); right now it's 5C or 41F. It does get hot during July, but not for long, maybe 3 weeks or so.

Darell · May 30, 2004

Everybody else beat me to it!

kWh are just kW times h. Your situation is 0.620 kW (620W/1000W in a kW). You just multiply that by the number of hours to get your kWh - and that's what you're billed for. The unit will likely cycle, and so won't be drawing that much constantly.

Factoid just for fun: I can drive my car 1,300 miles on the power to run that AC unit 24/7 for a month.

raggie33 · May 30, 2004

how in the world do ya do that darell that .car id assume has like a 4500 watt electric moter? .

raggie33 · May 30, 2004

o ps i doubt it will cycle,the room is around 15x15 with 10 feet ceiling i got a 6000 btu unit.it realy needs id guess 7000 btu but. i couldt find one.and a course one that is to big dont run long enough to remove humidty from room and it is so humiid down here

javafool · May 30, 2004

Here in Clearwater it is getting to the season where it is 92-95°F during the day and cools all the way down to 78-82°F at night (well, by 4:00 in the morning anyway.) 92° now at 4:00 in the afternoon. I will turn off my heat pump next August or September I guess.

Even at that, it is cheaper than heating all winter long

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