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Power Consumption of Some Electronic Devices

2009-04-18

Updated: More thourough investigations into power consumption shows that it is perhaps not quite as bad as it seems below. The meter used below seems to have quite a large error when there is a large difference in phase between voltage and current… So the figures below should probably be seen as wort case using a cos(phi) close to one, which is not always the case.

A friend of mine let me borrow his power meter under the condition that I posted the results here. So here we go. The meter does not have absolute accuracy, but I’d guess the values below are within a watt or so.

  • Brodband Router (with phone connection) – Inteno (Bredbandsbolaget standard)
    On: ~5W
  • NAS – WD MyBook World II 1TB
    Power adapter alone: 4W
    Turned off: 3+4=7W
    Sleeping: 8+4=12W
    Streaming music, network sharing: 12+4=16W
  • Printer – Epson Stylus Photo R200
    Turned off: ~0 W
    On, no print job: 4W
  • USB Hub 4 Ports – Deltaco UH-410 with separate power supply
    On: ~0W
  • Wlan router – Apple Airport Extreme
    On: 14W
  • Homeplug — Netgear HD Ethernet Adapter HDX101
    On: 7W (each)
  • External har drive – old 2.5″ laptop drive connected to Airport
    Sleep: ~0W (power from USB hub)
  • Computer – Apple Power Book 15 G4
    Sleep: ~5W
    Idle: ~25W
  • Router/Music streamer – Apple Airport Express (APX)
    On, not streaming: ~2W
  • Radio – Denon TU-225
    Off: ~0W
  • Amplifier – Nad C350
    Off: ~0W
    On, not playing any music: ~31W
  • DVD player – Pioneer DV-410V
    Off: ~2W
  • ”Power Saving” switching outlet from Clas Ohlson
    Always: 7W (Seems this is not quite true, cos(fi)=0.1 or so and the meter does not get that)
  • Phone – Siemens Gigaset 3010 Micro
    Base station, not charging: ~4W

That’s it. That means that if I keep my home network and NAS up 24/7, the power consumption is at 40W in standby, not including the custom broadband router used for my internet connection and telephone. That’s probably another 10-15W. Counting on 50W and assuming a power cost of SEK1/kWh, it adds up to more than SEK1 each day. Yikes.

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