My UPS is making clicking sounds

I have a Synology nas which I am connecting to an Eaton 5e850iusb UPS. Before I used to live in UAE. There the government is giving continuous electricity. The UPS never made a sound and very rarely it would make a clicking sound and it would beep once. The electricity didn't cut when that happened.

Now I am living in Lebanon. Here the government is cutting the electricity a lot. We have a subscription with a guy who owns a generator and we get electricity from the generator when the government cuts the electricity. The UPS is randomly making clicking sounds when we get electricity from the generator and sometimes the light in my room dims a bit when the clicking sound happens. Also sometimes the UPS makes a clicking sound and it beeps once when there is electricity.

I know that the electricity going into the UPS from the generator is dirty and is fluctuating. The UPS is line-interactive and uses AVR (automatic voltage regulation) to correct the fluctuating electricity by either boosting or lowering the voltage when it gets too low or too high. If the UPS beeps when the clicks happen then that means that the battery is used to correct the fluctuating electricity. If it doesn’t beep when the clicks happen then the AVR is correcting the fluctuating electricity without using the battery.

The problem is that I am often using electricity from the generator so the UPS is clicking a lot these days and it clicks 20 to 50 times daily. I know that it's the UPS's job to click when the electricity fluctuates but I am worried what a lot of clicking will do to the UPS so I made inquiries about that.

I got mixed replies. Some people told me that the clicking is killing the UPS faster because wear and tear is happening to the part that is clicking so I became worried that the UPS won't last a long time. Other people told me that the part that does the clicking can handle a lot of clicking and it will stay ok for a very long time. Who is correct?

Hey, I have an APC Smart UPS. I'm in the UK so it's not really needed, but sometimes during storms it gets a bit clicky. Similar thing happens, the lights dim and the UPS clicks. All this is, is the UPS switching between battery and mains as it believes the power is too low or about to go off completely. Somewhere in mine there are settings to set the voltage at which it will switch to battery but I haven't touched that as it works okay. It sounds like the generator is not providing a consistent voltage. I’m not sure to be honest how long a UPS is meant to be able to switch between battery and mains when doing it constantly. In any case, if your lights are flickering your PC might switch off if not connected through the UPS.

To add to this, my UPS is over ten years old, the only parts I have had to replace are the batteries. Everything else is working just fine even after all that time. That's actually something I have to do ASAP as just last week the batteries failed.