APS UPS Is 88 volts minimum ok for iMac?

Minimum consistent voltage(s) are those specified on the product label
and in the technical specifications included with the product & online...

However, the APC UPS has settings which can be used to choose
when their product elects to switch to battery-backup or filter power.

While I have (two) APC UPS 1250VA 750 Watt units (figure watts, half)
I have not chosen to set that aspect of alleged protection from default.
You may have to contact American Power products (Schneider) to
get Customer Support and feedback on what their settings do for you.

I've monitored the voltage and watts via the thoroughput evidence in
the little LED screen, on my APC unit. So far, it has worked out as-is.
And mine are set to shut down the computer at 50% battery life.

The run-time on these units is really quite short; a 1250VA is 'up to'
about 112 minutes with a low-powered computer. Or 35 minutes, tops.
I figure about half the life and time they suggest; just in case.

(They have a configuration page which tells what kinds of load each
model they sell can sustain, under ideal conditions. Or they used to.)
http://www.apc.com/sizing/selectors.cfm

Perhaps someone who has configured their UPS settings in detail, can
shed some additional thoughts or information on what else is involved.

• APC Support:
http://www.apc.com/support/index.cfm

The actual computer power should remain relatively constant; so the
APC settings should allow you to choose a safe margin of switching.
The 'automatic voltage regulation' these allow has been adequate so far.

Good luck & happy computing! 🙂

+{ edited }+

Actually, the computer specs at APC don't really matter as much as technical specs
of their products; since the battery backup and switching, durations, load, protections
and other bits of information are regular numbers that can apply to any product on
the end of the wire, relying on their uninterruptible power supply/backup. Even a TV.

Somewhere, in a reply to some other user's question, I'd found an even better page
at APC where the product specs were spelled out good enough to be used to help
find a competing brand product or a similar item, in New Zealand or Australia. This
is because some of these are set up for 220/240 VAC and run at different amperage.
There other models for other country's electrical specifications are curious, here.

You can tell a thing or two about your newer Intel-based Mac by checking specs on
the model's power supply; the spec sheets (everymac.com; mactracker.ca) have.

The 'switching limits' of these products and the protections they allegedly provide,
are items of interest; since the APC battery runs the computer when the power is
either too low or too high. And some of their settings probably allow a little control.

Other controls, in your Energy preference panel, will show the UPS settings. This
is where you can choose to have the Mac shut down on a certain % battery margin.
Obviously, a model with sufficient reserve capacity, may allow greater runtime.

And I see what you mean by their • UPS Selector Sizing applications (APC)
http://www.apc.com/tools/ups_selector/index.cfm? - being outdated by model.
Although they have a way to add a different computer model, it is suspect.

If you register at the APC site, you can ask questions of someone via a form/email.
Since I have not done so, I'm not sure of the level or duration of support they offer.

Good luck & happy computing! 🙂

{ edited }

You do not need to install any APC software for these units to work
with your Mac OS X system. The control panel in System Preferences
Energy saver will show an additional tab when an APC/UPS is attached.

There is a data cable included with most of the upper-end products and
it has a USB2.0 plug on one end and a data cable (like ethernet) plug
on the end which goes into the APC. This is what controls the APC from
the Mac OS X. The USB end can be plugged into a Mac or a powered
USB hub, so long as that Hub would see backup power during an outage.

You +do not need any special software+ and it is well advised to NOT get any.
The Mac OS X has built-in support for UPS and often it is newer than APCs.

Good luck and happy computing! 🙂

Glad to hear things worked out and you've gotten the controls
to function (at least in your main computer) correctly. Some of
the settings in Leopard 10.5.8 can be different than Snow Leo
10.6.x, those may include more features on the newer OS X.

The older OS X system should have its own way about using
the Energy settings; some may require a restart to recognize.

Since my daily use computer is left to sleep, and not shut off, it
relies on UPS backup power with automatic voltage regulation.
(A second computer can also use my main APC, but it does not
have any control over reserve power. It also is not left on.)

Hopefully the product works satisfactorily; the first APC I owned
was not good at all, and their customer relations suggested I
mail the unit back (to lower 48) as a remedy. No warranty. It was
only a week old and would have cost me plenty from Alaska.

{I let the new APC charge up 48 hours before using it; and then
it would unexpectedly quit and leave my Mac powerless. This
is never good for the operating system or open applications.}

So, I torture-tested the unit without my Mac attached; until I found
by testing it, the semi-defective circuits 'burned in' and it worked.

But I've never trust APC's customer service, after the first unit... A
1,000 Watt halogen work light helped it find realization of purpose.
Figured if I was going to dispose of a brand new (CompUSA bought)
uninterruptible power supply with AVR, I'd try to toast it first...!!

You can test your APC after it's fully charged, by putting a huge load
on it, and then pull the APC's power cord from the mains. Then, jamb
it back in, and unplug it again, again, etc. so on. Minor stress testing.
The load at test time, obviously should not include an Apple product.

Anyway... have fun.
Good luck & happy computing! 🙂