UPS suggestion for 24" iMac

Question

Any suggestions on which size UPS to get for my 24" iMac?
Nothing else connected to it.
Thanks,
Marcantonio

Answer 1

Depending on what kind of backup runtime and other features you expect to
have in an uninterrruptible power supply, the size may end up being rather big.
A simple APC 1250VA 750Watt unit will only run my iMac G4 17" 1.25GHz
computer (uses about 40 watts) for a little more than an hour. With the native
OS X UPS software already in the system, you can set the UPS to shut off
the computer in Energy Saver system preference panel, and manage some
basic settings for using the UPS with most any modern Mac and not need
the APC or other branded software they include on a CD in the box.
If you hope to be able to catch any processes in-progress and complete them
during an unexpected power interruption, you would need to have an external
enclosed hard disk drive or time machine device also running on backup power;
then you could at least hope to save any initiated processes completely even if
the power should go out during a routine backup of your system files or work.
Since a UPS can auto-switch and maintain power at a tolerable level during a
brown-out or surge of high power, this 'automatic voltage regulation' feature
can save a logicboard, a power supply or other computer component from a
dose of bad power. These better models can also filter the power.
I'd avoid the inexpensive low-end units, since they also have a shorter life; not
just the battery backup cycles, but the lack of runtime when you may need it.
And some models have a better quality battery. A few I have owned have no
user replaceable parts inside; so the whole unit becomes disposable when a
battery should be easily swapped out.
It is a good idea to have two uninterruptible power supply units; one for the
computer and one for any accessories you may which to be able to run and
have filtered power go to; which would be attached to the computer. Things
such as powered USB hubs, and anything else, could be hooked up in a way
as to protect the computer from anything attached to the computer from a jolt.
Some items should not be attached to a UPS, but I have anyway; some kinds
of light fixtures and other accessories you may need while computing, so as
to finish the job and gracefully quit all tasks and then shut off the computer.
Availability of replacement batteries, factory warranty, and local coverage on
a UPS unit are things to consider when buying one; the batteries are heavy,
so if you end up buying one, note the shipping costs can erase a bargain deal.
Good luck & happy computing!