rolf wroteThis if for an electrical specialist to answer.
I can only speculate, using my limited electrical knowledge.
For one thing, I don't think a UPS should switch off at all, except when the battery is empty. Is it a proper UPS, or just a switching backup, that switches automatically from power to battery? When I say a "proper UPS" I mean something that would supply power from the battery all the time, even when you have electricity.
Another thing I could think of is how the power cuts. Is it clean? Or maybe it has some kind of peak (which triggers a protection in the UPS maybe?) or on the other hand it fades out which fails to activate backup power. Or maybe it has something to do with the frequency of the AC power? Something that would interact with the mechanism inside your UPS (of which I know nothing).
Really it needs an electrical "geek". There are people like this in Lebanon. Maybe you can ask an electrician.
Have you had any other electrical problems in your house?
I'm not sure the UPS switched off or not. Perhaps just reset. The old one was a PCE and the new one is a INVO with much higher VA.
The computer just resets as if shocked and reboots.
None of this happens if I manually turn off the electricity in the house. If I do so, the computer continues working normally and UPS starts blinking. It also never happens when moteur goes off.
The reset only happens at the scheduled 3-hour electricity poweroff.
I just tried it again. I turned off the elecrticity in the house for 5 minutes and computer did not reset. It only happens when the electricity company takes off the electricity for that 3-hour period.
Ok, I'll talk to an electrician.
PS. I got something called
D&S voltage protector a while ago. It didn't help.
About other problems, nothing out of the ordinary except a one year old LG 23" monitor showly dying within three month. I got a samsung which seems to be holding up better so far.