Quad G5 requiring huge amounts of power when waking? (Overloads Back-UPS!)

I have an uninterruptible power supply (UPS), an APC Back-UPS RS 1500 (model BR1500). It is rated to deliver 865 W (1500 VA).
When I woke my PowerMac G5 Quad from sleep a couple days ago, I got an overload warning on my UPS for the first time ever. After speaking to the support person at APC, he decided to send me a replacement because even with everything disconnected from the UPS, the overload indicator still stayed on, and a "cold start" didn't solve it. Basically, my Quad killed the UPS. I thought maybe it was just an isolated incident.
Today, while I'm waiting for the replacement from APC, I borrowed an APC Back-UPS XS 1500 (BX1500) from a friend. It has the same power capacity as my model. A few minutes ago, I woke my Quad G5 from sleep and AGAIN I got an overload warning from the UPS. I turned off the UPS, disconnected my Quad, and turned the UPS back on again. This time, the UPS seems okay. It didn't "die" like my BR1500.
I've had this Quad G5 for about 7 months, and I wake it from sleep perhaps 5-10 times a day. Until a couple days ago, I never had an overload warning on either the BR1500 or the BX1500. Now I'm afraid to put my Quad to sleep. I'm not sure why this is happening twice in a few days, while it never happened during the thousands of times I've woken the G5 from sleep before.
According to Apple's knowledgebase, the Quad can require as much as 550 W when working on processor intensive tasks. I don't know how much it is requiring when waking from sleep. Both of these UPS can deliver 865 W (1500 VA).
Any help or insights would be very much appreciated.
PowerMac G5 Quad 2.5 GHz 3GB RAM 2x500GB hard drives   Mac OS X (10.4.7)   NVIDIA GeForce 7800GT

Doc-
I don't see anything at all in the APC document regarding inrush current. Maybe I am missing something.
You say that this hasn't happened before and to two different units. I still refer to my original post where I stated that you may indeed need a more robust UPS, but my gut rtells me this is not it.
I don't know where you are geographically located, but where I am we just went through some unusually hot weather. That put a huge strain on the electrical grid to keep up. Has the AC by any chance been on in the building when this has happened?
I do not know the technical expertise of the person from the post that measured various current draws, but generally one does not do that with an oscilloscope. You can, but generally it is easier to clamp an amp meter to the line and measure it that way. An o-scope would require a big resistor and access to the physical wire inside of the Mac's power cable, not to mention the math needed to compute the current readings. I can assure you that if that Mac drew that much power at any point it would at minimum trip the circuit breaker.
Try this: plug the Mac and the UPS into the same outlet but don't plug anything into the UPS. Put the Mac to sleep and wake it up. Does it still cause the UPS to kick in? If so, that would definitely point towards the incoming line.
Nothing else really makes sense here. I don't know why you draw more instantaneous power when awakening as opposed to cold boot but I guess that the Mac has some sort of "soft start" where it doesn't slam the power supply all at once with things powering up but does it more methodically.
Although it may be the UPS, I would start looking at environmental and infrastructure elements.
Luck-
-DaddyPaycheck

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