I've read a couple articles about energy usage around the home. One article Atop TV Sets, Cable Boxes and DVRs Drain Power - NYTimes.com states that a DVR might use "... 446 kilowatt hours a year, about 10 percent more than a 21-cubic-foot energy-efficient refrigerator, a recent study found." Since I have Kill-a-Watt energy monitor I decided to see what my home entertainment setup used.
I have a UPS plugged into the wall outlet and I have the following devices plugged into the UPS:
- DVR
- Google TV
- Wireless Router
- DVD player
- Wii
- Digtial delay device
- 46 inch LCD TV
- Surround Sound
The Wii, DVR player, Digital Delay, and Surround Sound was not used during this sample. I only use the Wii when it's too hot to run, and the other items when I'm watching a DVD movie. So I would say the DVR, TV, and Google TV devices are my typical viewing set up.
Over 72 hours (3 days) my setup used 8.24Kwh or 2.75Kwh per day and just over 1000 Kwh per year. That's about $110 a year at 11 cents a Kwh. When 'off' 85 watts per hour (2Kwh per day) is used , and the 'on' usage is 142 watts per hour (3.4Kwh per day). Like the article says you don't save much when turning the devices off. 2.75Kwh - 2Kwh = 750 watts per day for me which is less than 9 cents a day to have them 'on' for just over 13 hour per day. 750 / (142 - 85) = 13.16
The NY Times article never actually stated what a typical household used. The study the NY Times linked to never said either, but there was a table that showed 617 Kwh per year. Based on what I am using I would say that 617 Kwh is conservative when you add in the TV and the internet access needed to stream video.
I think a Kill-a-Watt device is well worth the $30 since it gives your real time and accumulated watts (watt hours) and the amount of time it has been measuring which is all you need to understand the energy usage. Kill-a-Watt are available online and home improvement stores.