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Electrical Efficiency Table PDF Print E-mail
Wednesday, 13 February 2008

So you’re looking at getting a generator but need to know what size to carry on your activities of normal daily living without the power interruptions we are having with the current load shedding.

To assist you in choosing the right size generator, below is a table, by no means comprehensive, but with most of the household items we use on a daily basis so that you can caculate your daily electricity consumption.

All electrical appliances will carry labels stating how many watts are required for them to run.   If the wattage is not stated then you can calculate the wattage by multiplying the volts by the amps.


The table below is an approximate guide to the amount of electricity used by the most-used household appliances.  Generally speaking, for items like TVs, etc. you will notice quite large variations and that is because the bigger the screen, the more power it uses. The same goes for an oven, the larger the oven, the more energy it uses.


The table below represents the amount of watts per hour used by a particular item.


ApplianceEnergy used (watts per hour)
Tumble dryer4,000 – 6,000
Oven3,000 – 6,000
Air-conditioning unit1,000 – 6,000
Stereo System250 – 750
Computer1,000 – 1,500
Electric space heater2,000 – 4,000
Fan heater2,000 – 3,000
Kettle1,500 – 2,500
Hob1,000 – 2,000
Iron1,000 – 1,500
Toaster1,000 – 1,500
Dishwasher1,000 – 1,500
Hairdryer700 – 1,500
Microwave500 – 1,000
Washing Machine400 – 1,500
Fridge500 – 1,500
Freezer500 – 1,500
Vacuum Cleaner200 – 1,000
Television50 – 400
Video/DVD/Satellite50 – 400
Cooker Extractor Fan100 – 200
Bathroom Extractor Fan20 – 200
Regular light bulb40 – 150
Low-energy light bulb10 – 20
Fluorescent Light10 – 20


Last Updated ( Wednesday, 13 February 2008 )
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