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San Francisco, USA


Home Power Usage

I have bought the Kill A Watt meter a while back. I went on to measure every gadget and applicances I can possibly measure. Here is some result to share.

Wattage Appliance
0W Clock Radio 1
Stereo off
TV off
LCD monitor off
1-5W Fax machine standby
Mac Mini sleeping
Wifi router
Charging small gadget
Inkject printer idling
clock Radio 2
6-10W Stereo playing Radio
DSL Router
11-25W Stereo playing CD
Laptop 1
15" LCD monitor
Compact Florescence tube
Space header (fans only)
Mac Mini On (+8W when playing DVD)
Motorola Set-top box (use same amount of power whether on or off)
20-60W Core i5 laptop
  • 0-1W while sleeping
  • 6W recharging while sleeping
  • 20W when idle
  • Power use increase when charging other devices or running many applications
30W 10cu ft refrigerator (24 hour avg)
46W Water Boiler & Warmer (24 hour avg)
Compact refrigerator (24 hour avg)
70W 32" LCD TV
340W space heater (24 hour avg)

My main observation is the concern on power usage by electronic gadgets, and also the phantom watt issue, that is gadget continue to draw power when they are off, is largely overblown. Most sustain on just about 1 watt of power. The only rogue applicance is the set top box that uses 18W whether it is on or not. Even that is only 18W. In fact all the electronic gadgets added together does not match thw power usage of one space heater. This is evident in my skyrocketing winter power bill (or in hotter climate, the summer air conditioning cost).

Another interesting find. My new refrigerator uses 50% less electric than a much smaller but dated compact refrigerator. At this rate, it will actually come very close to the estimated annual electric cost of $38 that is posted in the tag in the store.

2011.12.24 [] - comments



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