Thank you, no issues with electricity I know what to do ;) This ups is planed for my bedroom, and really do not want beeping sounds until i am slipping.

Can be some other small ups … but must have AVR since sometimes a I have some voltage anomaly ( dont ask why long story ) also short power outages … for 1 to 2 mins … not every day but once per month happen … And yes is nothing which is related to my el. Installation.