Hello.
My research was done around March '08 just when the 8-core Mac Pro came out (and when I got my MP1.1 on closeout).
I guess you would call it Internet Hearsay, but I looked into it quite a bit.
At first I only wanted to find out what size Back-UPS to get. Then I found out about all the complaints. I had Google'd "Mac Pro UPS"
At the time, the MP1.1 had a lot of complaints about UPS shutdown upon wake from sleep.
This would only happen when running on batteries and because the UPS sends a signal to the computer over the USB it wakes the computer up when switching to battery power. This caused the Mac Pro to overload the UPS, thus causing shutdown for an awful lot of people (at the time). One person was even having trouble with an APC Back-UPS 1500? if I recall correctly.
Further research found more Internet Hearsay about non-sine wave UPS's damaging certain kinds of computer power supplies.
Looking into it further, someone explained that a sine wave charges something called Primary Capacitors much differently than square or stepped wave. This causes a lot of heat and eventual failure (non-sine wave).
Of course this would only occur when running on batteries for an extended period or on a fairly regular basis. Regular line power is unaffected.
One person said a UPS company engineer (who spoke poor English) compared using a UPS to smoking cigarettes... slow death.
The general opinion at the time amongst 1st generation Mac Pro users was:
1- Back-UPS type UPS's might or might not work.
2- Smart-UPS type UPS's work great if sized large enough.
3- The UPS should be sized larger than the computers Power Supply max rating in VA (not watts) plus anything else plugged in.
So I set out to find a SUA1000 and ended up with a slightly used SUA1500 which has been great for a year and a half through many brownouts and a few blackouts.
As important as good backup power is how well the UPS adjusts for low or high voltage. I get quite a bit of low voltage here especially in summer. The SUA1500 then clicks and does its thing. It has something called Buck/Boost that lets it raise or lower line voltage quite a bit without turning on battery power
If one is going to the expense of buying a Mac Pro wouldn't it be a little silly to cut corners on a UPS?
The only bad thing about a Smart UPS (750, 1000 or 1500) is the higher initial price. Oh, and the weight!
Wow is that thing HEAVY! It's actually heavier than the Mac Pro itself.
Have Fun,
Keri
PS. By doing my research I avoided buying
TWO (or more) UPS's.
At least I like to think so.
