OS X Help Logo
Insanely simple tutorials for the first time Macintosh user
Web2 Delight - Transfer YouTube videos and Flickr photos to iPods. ✭

The importance of an uninterruptible power supply

Written by: Scott Haneda on Thursday January 10th 2008, 3:58 pm

Filed under: Hardware

Time for a small distraction from software related posts.

Everyone’s computer is plugged into his or her home power. Not all home power is the same. Some are clean, some are dirty, some are noisy, and all are potentially problematic.

Ever turn on an appliance only to have the lights dim? If you do not have an uninterruptible power supply (UPS), you are sending those power fluctuations down to your computer, and all the parts inside it.

There are full blown power outages, where power is abruptly removed from your computer. Probably the worst, is a brown out, where about half the power is supplied to your computer.

A UPS is a small battery. Once plugged into your power outlet, it will charge like any other battery. You then plug your computer into the UPS. From that point forward, your computer will run off of the battery.

You can even pull the plug from the wall, and your computer will still run, albeit for a short time. Long enough to allow you to save your work and gracefully shut down.

In addition, this battery will protect you from any surges and drops in power. In my opinion, this is a mandatory item to have. Data is just too important; computers are too expensive to repair. The chances of power fluctuations are too high to risk not spending a relatively small amount of money to protect yourself.

The nice thing about OS X, and the USB based UPS units, is they can communicate with each other. No need to install any additional software. Just plug the UPS into your wall, your computer into the UPS, and a USB cable from the computer to the UPS, and you are set. You will have new options in your Energy Saver Preferences that allow you to define what your computer does when there is a power outage.

Amazon has good deals on them, I am linking to the one I have, as I know it works, and I know it works with OS X perfectly. The unit is small, silent, and just works.

APC BP500UC Back-UPS Pro 500

For around $130.00, it is a small price to pay for knowing your computer will never fall victim to blown up components.

Want to be reminded when there are new posts?
Get post updates in your email or subscribe via RSS.
9 Comments so farLeave a comment

some *are* clean, some *are* dirty, etc.

Comment by salamander 02.02.08 @ 8:58 pm

I had an APC UPS for a while but gave it away after the power-out beeping drove my poor dog crazy. I’d purchase another one if it promised not to beep. Also, with the USB connection, do any of them actually work with a Mac?

Great site; keep up the great work!
Mac geek in Fairbanks, Alaska where it’s currently 25° below zero!

Comment by Catherine Franklin 02.05.08 @ 4:47 pm

@Catherine, yes, the USB works, with no software, it just works, and in some cases, you can use that to turn off the beeping.

The main reason for the beeping was probably that your UPS was underpowered for your Mac. If that was not the case, then you have really bad power, and should definitely get one.

Maybe you can email APC and ask them how to take the beep off.

Comment by Scott Haneda 02.05.08 @ 4:49 pm

[…] Run when the power goes off with a UPS. […]

Pingback by Did you know your Mac could do that? « ATMac 02.13.08 @ 1:40 am

I’ve used an APC UPS devices on several Macs for the past decade. They work well, especially for “dirty” power. Many years ago when I upgraded my Performa 6300 to a G4 desktop, I researched various websites for a good power surge protector. The very best one, but not cheap, was zero surge protector . If one reads their testimonials & the list of companies that use zero surge, it becomes very clear that they are the best investment one can make for protecting sensitive electronics, including plasma TVs.

Comment by Gary Thompson 02.14.08 @ 3:07 pm

@Gary, thanks so much for your comment on surge protectors. I want to clarify a few things to our readers…

A Uninterruptible Power Supply and a Surge Protector are two different things. A surge protector will prevent a rapid surge in electricity from blowing your electronics.

This is especially important in areas where lightning can hit your home.

99% of the surge protectors you will buy at Target and other stores of that like, are junk. If they are cheap in cost, they are cheap in quality. Even some of the more expensive ones provide you little to no protection. Electricity is moving very fast, for a circuit to react equally as fast is not a simple task.

I am sure your “Zero” brand is of good quality, since it seems you have researched the matter well. What needs to be clarified is that most electronic devices do not break as a result of a surge, a drop.

Brown outs and uneven power are usually the culprit. The only time I have experienced a surge that was noticeable, in lights getting brighter in my home, was when the power went out, and then came back on a few hours later. This is caused by less demand to the power grid.

A few summers back we had rolling power outs, where the utility would drop power to half or more. I blew a phone, DVD, television, and some other smaller items. It was the half power that killed my devices. I suspect for most users, this will also be the case.

A UPS, unlike a surge protector, while more expensive, cures surges, and drops. Your computer is not running on the power main, but running off a battery. It is impossible, from a electrical standpoint, for the power to jump past the battery and into your electronics. It can be a surge, or a drop, it does not matter.

The “Zero” line seems to be about the same price as a UPS, so I can not say you gain much. In the event of a power outage, it is nice to have 5 minutes to save your documents and shut down your computer. A surge protector will not afford you this luxury.

Thank you for the comment, it is always good to know your options.

Comment by Scott Haneda 02.15.08 @ 6:26 am

Scott - Your explanation is correct. Here’s some additional info re: UPS from the zerosurge.com website: “(A word about Uninterruptible Power Supplies: they are not surge suppressors unless they are certified as such. A UPS is a battery-backed device that keeps electricity flowing in the event of a blackout. They’re useful, often necessary devices, but they can be blasted by power surges as completely as anything else on a circuit.)”

Comment by Gary Thompson 02.15.08 @ 9:06 am

@Gary, you are correct. The UPS may very well get blown up. I guess a surge suppressor in-front of the UPS would be the best of both worlds, though a bit pricey :-)

A note to readers, if you do get a UPS, unless it is certified, I would not use the surge suppression plugs on it for items you care much about. Of course, the “battery” plugs on the UPS will provide you protection all around.

Comment by Scott Haneda 02.15.08 @ 9:40 am

UPS also good for AirPort unit, DSL modem, etc. A laptop (on battery) is OK without, but a good surge protector is reasonable when AC power charger is in use. Thanks for good, elemental instruction.

Comment by Ray Conroy 03.03.08 @ 3:17 pm



Leave a comment:
Line and paragraph breaks automatic, e-mail address never displayed, HTML allowed. Name (required)
E-mail (required), never ever shared
URI
Your Comment:

Apple Store
Apple Store
Apple Store