I've purchased a Line Interactive UPS 1200VA. It's supposed to give 8~20min backup (as written in the manual). This UPS has transfer time < 10ms. It works fine when the mains is active.
But the problem is that when the power went off, the PC also went off for a fraction of a second and started rebooting.
The strangest thing though is that it has to be a proper power failure by the service supplier. If I just turn off the power at the wall plug, the UPS kicks in immediately and the PC carries on working fine.
What's the solution of that? What should I do?
My hard drive was physically damaged because of improper shut down & restart. I've 5~8 times power outage in my country so I badly need an UPS.
Best Answer
Does your UPS also properly protect against surges as well as power drops? If not it could be that the power outage is preceded by a brief surge which rather then smoothing the UPS reacts badly too (or allows through and the PC's PSU reacts badly to it). I would expect that must UPS devices are also designed to smooth out surges as well as protecting against outages, but it might be the case that either not all do, or that the power problem your incoming supply presents is outside the range of what your UPS is intended to deal with. It could also indicate that your USP is faulty and not correctly dealing with circumstances that it should be able to brush off.
It would be a good idea to add the make+model of UPS to your question. Also, the country+area you are in may make a difference to how likely certain electricity supply anomalies are, so you might want to specify that information too.