Device Power Consumption List

Electricity is expensive! Currently the cost per kWh is around 7.4 cents. Don’t be fooled, you still pay a delivery charge and other fees, tax and sometimes even retail fees. This brings the actual cost somewhere around 15-20 cents per kWh. 

Using this calculation we can determine the monthly cost of using a single watt:

1 watt * 24 hours / day * 30.5 days / month / 1000 watts / kWh * $0.15 / kWh = $0.11 per month

1 watt * 24 hours / day * 30.5 days / month / 1000 watts / kWh * $0.20 / kWh = $0.15 per month

…and yearly this translates to roughly $1.30 to $1.80…per watt!

Who would have thought that a $1 100 watt light bulb could cost over $100 a year?

Here is a list of some devices which I have measured the power consumption using a cheapo power meter:

Device Name Min. Watts Max. Watts
Cisco RV042 Dual WAN Router 5 7
Cisco DCP3825 Cable Modem/Router(bridge mode) 7 9
Netgear GS605 5-port Gigabit Switch 5 7
Aztech DSL Modem (no sync) 2 2
Motorola SB5101 Cable Modem (no sync) 3 4
Dlink DGS1005D 5-port Gigabit Switch 3 4
Linksys WRT310N 4 4

A worst case estimate for the yearly cost in dollars would be determined by multiplying the average power consumption by a factor of 2.

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2 thoughts on “Device Power Consumption List”

  1. Thanks for posting min and max power consumption, but I’ve measured considerably more for my Linksys wrt310N router which runs at about 0.21 amps, or 25.2 watts @ my voltage. Any idea about why there would be such a difference? I note that industry test values for routers average ~ 6.5 watts and a similar model wrt300n is the industry’s worst at 35 watts. I’m currently on a campaign to reduce baseload at my house, so any ideas of which router is best performing per KWHr would be helpful.

    1. Hi Dave, thanks for the comment. My best suggestion to you would be to forego multiple devices and try and get a modem/router/switch combo. This is what I have done as I don’t have the need for a complicated setup. As for why we experienced such different readings, perhaps my cheap power meter isn’t very accurate, or there is a problem with your device causing it to draw excess power.

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