Study of device electricity consumption and annual cost

Philip Shuman

Overview
In searching the internet, I found very little data on ACTUAL power consumption statistics for various household items. In order to calculate ROI for investing in power saving devices, one must know how much your current devices are using. Many devices will have their MAX current draw printed on the back, but how close does the printed number come to their actual use? I purchased a P3 Kill-A-Watt power meter to measure how much electricity each device uses. As a service to humanity, I documented my findings provided here.

Means of Measurement
The Kill-A-Watt is capable of giving many different readings, but two are useful in calculating use as it applies to money out of my pocket:

Data:
US Dollars per KiloWatt Hour (KWh): 0.18
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Photo: Description: Measured Watts
(realtime)
Measurement Period
(hours:minutes)
Accrued KWh KWh per month Cost per month KWh per year Cost per year
Computers
Dell Optiplex 780 (circa 2011) Intel Core2 Quad CPU Q9650 3.00GHz; 2 SATA drives; Windows 7; On 24/7 typical 40 hour work week use. 342:00 39.60 84.584 $15.23 1015.008 $182.70
Pentium 133MHz Firewall, single IDE drive 36 26.298 $4.73 315.576 $56.80
IBM Thinkpad T43 Pentium Mobile 2.00GHz
(on, charged, with display, idle)
22 16.071 $2.89 192.852 $34.71
IBM Thinkpad T43 Pentium Mobile 2.00GHz
(on, charged, display off, idle)
14 10.227 $1.84 122.724 $22.09
Computer Monitors
CTX 17 inch CRT Monitor (idle) 3 2.192 $0.39 26.304 $4.73
CTX 17 inch CRT Monitor (on 24/7) 98 71.589 $12.89 859.068 $154.63
CTX 17 inch CRT Monitor (my usage) 370:00 10.3 20.336 $3.66 244.032 $43.93
Dell 19 inch P992 CRT Monitor (idle) 1 0.731 $0.13 8.772 $1.58
Dell 19 inch P992 CRT Monitor (on 24/7) 121.5 88.756 $15.98 1065.072 $191.71
Dell 19 inch P992 CRT Monitor (my usage) 189:00 3.17 12.252 $2.21 147.024 $26.46
Dell 1907FP 19" LCD Monitor (1280x1024 60Hz DVI) (on 24/7) 24 17.532 $3.16 210.384 $37.87
Computer Accessories
Linksys WAP11 (on 24/7) 4 2.922 $0.53 35.064 $6.31
Netgear router 190:00 0.59 2.268 $0.41 27.216 $4.90
LaCie external USB 250GB hard drive 8 5.844 $1.05 70.128 $12.62
LaCie external USB 250GB hard drive 84:33 0.73 6.307 $1.14 75.684 $13.62
Western Digital MyBook external USB/eSata 500GB hard drive in use 9 6.575 $1.18 78.9 $14.20
Western Digital MyBook external USB/eSata 500GB hard drive idle 7 5.114 $0.92 61.368 $11.05
Western Digital MyBook external USB/eSata 500GB hard drive sleeping 4 2.922 $0.53 35.064 $6.31
Western Digital MyBook external USB/eSata 500GB hard drive normal use (24/7) 97:14 0.42 3.155 $0.57 37.86 $6.81
Electronics
Brother intelliFAX 600 (idle) 6 4.383 $0.79 52.596 $9.47
Brother intelliFAX 600 (idle) 231:00 1.54 4.870 $0.88 58.44 $10.52
AudioVox CNR 4 cell phone charger (idle) 69:07 0.00 0.000 $0.00 0
Sceptre 32inch LCD HDTV X32GV-Komodo (idle) 0 0.000 $0.00 0
Sceptre 32inch LCD HDTV X32GV-Komodo, on 24/7 with backlight at 0 100 73.050 $13.15 876.6 $157.79
Sceptre 32inch LCD HDTV X32GV-Komodo, on 24/7 with backlight at 4 119 86.930 $15.65 1043.16 $187.77
Sceptre 32inch LCD HDTV X32GV-Komodo, on 24/7 with backlight at 9 144 105.192 $18.93 1262.304 $227.21
Sceptre 32inch LCD HDTV X32GV-Komodo, on 24/7 with backlight at 10 149 108.845 $19.59 1306.14 $235.11
DirectTV Scientific Atlanta HR22 PVR (24/7) 37 27.029 $4.87 324.348 $58.38
Dish Network Vip 211k 'off' 28 20.454 $3.68 245.448 $44.18
Dish Network Vip 211k active 30 21.915 $3.94 262.98 $47.34
Dish Network Vip 211k typical use (24/7) 50:34 1.49 21.525 $3.87 258.3 $46.49
Household
Refrigerator: 1987 Kenmore 23 cu. ft. 236:00 32.09 99.329 $17.88 1191.948 $214.55
Refrigerator: 1990s vintage 99:38 10.72 78.598 $14.15 943.176 $169.77
Refrigerator: 2011 Whirlpool 25cu ft side-by-side 477:00 25.61 39.220 $7.06 470.64 $84.72
Refrigerator: 2013 Kenmore Bottom Freezer 370:00 28.15 55.577 $10.00 666.924 $120.05
8 inch Household fan 110vac (on 24/7) 423:00 8.01 13.833 $2.49 165.996 $29.88
Two 4 inch PC fans with 110vac power supply (on 24/7) 97:00 0.37 2.786 $0.50 33.432 $6.02
Plug in style air freshener 110vac (on 24/7) 291:00 0.42 1.054 $0.19 12.648 $2.28
Fountain pump (750liter/hour) (on 24/7) 8 5.844 $1.05 70.128 $12.62
Fountain pump (200liter/hour) (on 24/7) 2 1.461 $0.26 17.532 $3.16
iRobot Roomba 550 fully charged (idle) 4 2.922 $0.53 35.064 $6.31
Marineland Eclipse 6 (PFEC 06) pump/filter 5 3.653 $0.66 43.836 $7.89
Marineland Eclipse 6 (PFEC 06) fluorescent light 8 5.844 $1.05 70.128 $12.62
Lighting
50W Desk Halogen Lamp (high) 53 38.717 $6.97 464.604 $83.63
50W Desk Halogen Lamp (low) 37 27.029 $4.87 324.348 $58.38
100 mini Christmas lights (incandescent) 39 28.490 $5.13 341.88 $61.54
100 mini Christmas lights (incandescent) 44 32.142 $5.79 385.704 $69.43

Notes

Philip Shuman
http://www.shuman.org/
philip at shuman dot org
July 29th, 2011