power button

I stumbled across this money-saving tip today. A company called Bits Limited sells “smart” power strips. Here’s how they work: You plug a device into one of the plugs, and when you turn that device on, it switches power on to other outlets. The strip also figures out how much energy the device uses when it’s off, so when it senses you’ve turned that device off, it cuts power to those other outlets.

Here’s an obvious use: Plug your TV into the master outlet, then plug your VCR, DVD player, cable box (or powered antenna if you’re a cable-hating tightwad like me) into the autoswitching outlets.The reason these strips work is because most home appliances use power even when they’re switched off. A powered-off TV uses power because part of it has to stay on all the time waiting for you to hit the power button on your remote. The same thing is true of your DVD player, VCR, and anything else that has a remote. Any device that uses a plug-in “wall wart” transformer is also consuming power. The transformer chews up a watt or two even if the device it powers is turned off.

So if you can bring yourself to walk over to the TV to turn it on rather than using the remote, you can buy the cheapest $31 model for each TV in your house and plug your stuff into that. (To save more money, check for refurbs.)

The manufacturer states one of these devices can save you $11.55 a month, on average, when used with a computer.

The savings won’t be as high with other devices like TVs, but you can expect to save a few dollars and in the summer, you’ll save slightly more because those devices won’t be generating excess heat that your air conditioner has to dissipate. Each strip you buy should pay for itself in less than a year.

Plus, those wall warts will last longer if power is cut to them when they aren’t in use. I’ve come across numerous “broken” old-school video game machines whose only problem was a burned-out wall wart. Replacements can be pricey ($10-$20), so if these power strips save you from having to replace two of those over the lifetime of the unit, they pay for themselves right there.

The company also sells beefier units with more outlets and more protection intended for computers. The idea there is you can plug the computer in, and when you turn your computer off, it will automatically shut off your monitor, printer, and any other peripherals you have in order to save power.

I have mixed feelings on using these with computers. From an energy consumption standpoint, having a computer powered on all the time is comparable to having the lights on in the room all the time–and we’re talking old-fashioned incandescents here, not CFLs. So plugging your computer into one of these devices and turning it off when you’re not using it would save a lot of power. While computer monitors should be turned off when not in use, there’s nothing worse for the computer itself than turning it off and on repeatedly. I leave my computers on all the time, and in the last 10 years, I’ve had two hardware failures. One was a hard drive crash in a laptop (very difficult to avoid), and the other was a dead power supply in an HP Pavillion desktop after a power failure. As underpowered as that power supply was, that failure probably was inevitable too. Two failures in 10 years is a pretty good record.

Electricity is expensive, but computer failures are expensive too. I prefer to leave my computers on, save power where I can (I own several computers but they all only print to one printer, for example), and maximize my computers’ life expectancy.

I’m thinking very seriously about at least ordering one of these for the living-room television. It won’t pay for itself as quickly as the programmable thermostat did, but they only cost about $5-$10 more than a traditional power strip with comparable protection ratings. If I look at them as a $10 investment instead of a $30 investment, they’ll pay for themselves pretty fast.

I did go looking for other manufacturers. It appears that Fellowes made these in the past but has discontinued them. For now, it appears Bits Ltd’s offerings are the easiest ones to find. It would be nice if that changed.

A crude way to get some of the benefit of these is to use an electrical outlet timer. Plug the timer into the wall, plug your power strip into the timer (assuming the timer has a grounded outlet), then set the timer to cut the power off at night. The savings won’t be as dramatic, but if you happen to have a timer or two around the house to control Christmas lights, you might as well put them to use saving you some money during the other 10 months of the year.