UPS: APC BX1100li-ms
Clicking sound frequency: (2 to 4 clicking sound per day)
Connected device to UPS: PC (aprox. 450w) and Router (???watts) only
Setup: Main outlet ---> 500 watts AVR ---> UPS ---> PC / Router
Question:
1) is the clicking sound normal?
2) should i be worried?
additional info:
UPS is almost 1 1/2years,
no sign of power fluctuations noticed during the clicking sound.
UPS worked with my PC during an outage and fluctuations a weeks ago.