What does it cost to run a portable air conditioner?
I’ve bought a 9000 BTU air conditioner from B&Q:
www.diy.com/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=9333257&fh_view_size=10&fh_eds=%3f&fh_location=%2f%2fcatalog01%2fen_GB%2fcategories%3C{9372015}%2fcategories%3C{9372041}&fh_refview=lister&ts=1246271483002&isSearch=false
but I’m confused as to how much electricity it uses. The leaflet says:
"Annual energy consumption, kWh in cooling mode: 577"
"Cooling output kW 2.8"
"Energy efficiency ratio 2.41"
If I call 1kW 10 pence per hour (tbh I’m not sure what electricity costs) would that mean 577kW equals £57 per year? Or have I got the math completely wrong as usual?
The unit has an input power of 1200w but I doubt it runs at that level.. 1000watts = 1kilowatt so if I run it for 10 hours a day that would be £30 a month! That sounds hideously expensive to me.
Can anyone please tell me what this thing really costs to run because if it really does cost £30 a month I might take it back to B&Q and buy a huge commercial/industrial fan instead.
Waaaah! My head is hurting trying to figure out the numbers. :-O
Who is right, Peter or Foggy? Is it £25 a month or £25 a year?
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2.41 = the watts of cooling per input watt of power. So, if you are getting 2.8KW of cooling, your input watts at that level are 1200 watts. But that includes uses that are not purely for cooling – such as running the fan and possibly an evaporator and/or condensate pump if so-equipped.
So, start with the input power. AC units are motor-driven, so the input power will be the requirement to operate the cooling fan at the highest level and the compressor simultaneously – in other words, flat out.
Let’s assume that you operate the unit for twelve (12) Hours per day, during which the compressor operates for six (6). Let’s assume that the cooling fan is on ‘medium’, so not-quite flat out.
Your average draw will be a combination of: 6 hours @ 90% of full input.
6 hours at 20% of full input (just the fan).
6 x 0.9 x 1200 = 6480
6 x 0.2 x 1200 = 1440
1440 + 6480 = 7920
7920/1000 = 7.9kwh/Day
= 79 pence/day
79 x 30 = 23.70 pounds/month.
100 days/year = 7900 pence or 79 pounds per year.
These figures will be pretty close – less or more depending in the hours it is used and the actual load on it. But with motor loads such as AC units, the rated input power is very close to actual consumption when running flat out. And the compressor has only one operating level, the variance will only be in the fan and any other accessory loads, and no more than about 30% of the total load, if even that much.
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LikeDislike"Energy efficiency ratio 2.41"
Only true way to find out would be to write down what you pay now. Plug it in wait for the next bill and determine the amount difference.
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LikeDislikereally an air conditiones use a compresor that consume alot of energy
it would be recomended if the room is litle and thre is no much people to go into or go out this is a ral problem
for example in a car there are no problem cause all the windows are closed and there are noone who is open opne the doors
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LikeDislikeYou can’t judge it by the month because it will not be running constantly all month will it? In USA this unit would run for 8 hours for about $1.
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LikeDislikeAll of yall are wrong. The energy consumpton is based on kilowatt hours not actual hours. Energy in kilowatt hours is the product of power in kilowatts and time in hours; it is not "kilowatts per hour".
Using a 60 watt light bulb for one hour consumes 0.06 kilowatt hours of electricity. Using a 60 watt light bulb for one thousand hours consumes 60 kilowatt hours of electricity. Seems to me you multiply 577 kwh by how much a dang kwh is in your are of the world.I am going to say that puppy cost less than 25 pounds a year to operate in the UK.
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