Energy use by household appliances

We monitored many of our household electrical appliances with Kill-a-Watt monitors over many hours, typically more than a week. The usage figures are considered typical for our habits, for some items we monitored usage over 10 or more weeks.... note, 10 weeks is 1,680 straight hours.

For comparisson, the hourly usage rate was determined (use / time), and then multiplied to determine the cost over a year (24 hours * 365.25 days).  The DoE Appliance Data is another resource you should consider.

ApplianceNumber of
appliances in
the home
Total use
(kw)
Number of
hours use
monitored for
Use per
hour
(kwh)
Estimate cost
per year
100 Watt Equiv CFL (25W) 4 2.05 255.00 0.008043 $24.54
40 Watt Equiv CFL (11W) 13 4.86 1,104.00 0.004402 $43.64
60 Watt Equiv CFL (15W) 15 2.42 525.00 0.004618 $52.82
Battery charger 1 0.46 206.00 0.002233 $1.70
Cabinet Light 2 0.39 369.00 0.001057 $1.61
Clothes Dryer 0 0.00 0.00 0.000000 $0.00
Desktop Computer 1 73.33 3,175.00 0.023096 $17.61
Electric Piano 1 0.07 1,310.00 0.000053 $0.04
Emergency Light 1 0.42 625.00 0.000672 $0.51
Emergency Torch 1 0.73 567.00 0.001287 $0.98
Fridge 1 20.29 335.00 0.060567 $46.19
Garage Door Opener 1 5.06 893.00 0.005666 $4.32
HP Laptop computer 1 3.54 226.00 0.015664 $11.95
Hifi 1 18.97 1,310.00 0.014481 $11.04
IBM Laptop computer 1 9.64 543.00 0.017753 $13.54
Iron 1 0.80 650.00 0.001231 $0.94
Kettle 1 6.10 877.00 0.006956 $5.30
Kill-A-Watt 8 0.35 1,222.00 0.000286 $1.75
Microwave 1 128.05 10,785.00 0.011873 $9.05
Modem 1 21.17 5,162.00 0.004101 $3.13
Office (1 printer, scanner, flatscreen, USB Hub, phone, computer, shredder) 1 71.49 3,045.00 0.023478 $17.91
Paper shredder 1 0.41 544.00 0.000754 $0.57
Phone - Base station 1 9.41 3,335.00 0.002822 $2.15
Phone - Slave station 4 1.18 527.00 0.002239 $6.83
Radio/CD player 1 2.99 1,310.00 0.002282 $1.74
Signal booster 1 0.86 334.00 0.002575 $1.96
Solar Pump/Controller 1 23.51 4,558.00 0.005158 $3.93
VDU Screen switch 1 1.08 544.00 0.001985 $1.51
Washing Machine 1 4.81 1,703.00 0.002824 $2.15
Wireless router 1 27.52 2,810.00 0.009794 $7.47
Work office 1 66.47 3,480.00 0.019101 $14.57
Estimated total cost per year (8.7cents per kwh) $311.49

NOTE: We do not have a Clothes Dryer, we line dry all our laundry.

Our change in habits per collecting this information.....

We no longer keep our computers on 24x7. Previously, in a period of:

Running our home computer, printer etc (the equipment under the "Office" classification above).

Now we only turn it on when we need it, the new costs are reflected in the table above.

Email: darrell AT nearto.us
Web: http://www.nearto.us/
Copyright (c) 2007-2009 Darrell Edgley