Do I need a better UPS?

Solution
Does the UPS have a battery test? Or a software suite that monitors the UPS and reports problems? On the face of it, it sounds like your UPS cannot keep up with the power requirements of the PC. But have you tried the same thing with the computer plugged into a bare wall socket (not into the UPS)? If the computer still shuts down, the problem is probably the PSU.

mazboy

Commendable
Dec 28, 2017
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Does the UPS have a battery test? Or a software suite that monitors the UPS and reports problems? On the face of it, it sounds like your UPS cannot keep up with the power requirements of the PC. But have you tried the same thing with the computer plugged into a bare wall socket (not into the UPS)? If the computer still shuts down, the problem is probably the PSU.
 
Solution