chinnyhill10 wrote:
I have a Belkin 400 VA UPS. This was dandy for my old PC. However as some of you may recall I decided to plug it into the Mac Pro. I never actually got the two to talk to each other, but I left it plugged in on the basis that at least it would buy some minutes in the event of a powercut.
Problem is that it didn't. The power dipped for a second, everything else stayed up but the UPS just died and the Mac with it (and if on the mains the Mac is the one that usually stays up longest if the power dips).
The old PC and LCD together only utilised just over 50% of the capacity but the Pro just makes it want to cry. I think it's the initial surge that is killing the UPS.
Apple say the unit consumes 171 watts idle 250 watts at max CPU. + my three hard drives. No idea how that converts to VA.
About the same, so it should have been OK. Are you sure the UPS is actually working properly?
As for "initial surge".. well, there shouldn't really be one. The UPS output stage is in circuit all the time, the system just has to hold up the DC bus when it starts to fall due to the mains going.
If the batteries are shot, obviously, it won't manage that.