When your voltage ranges are unstable (ie: power stays on, but the particular voltage amount varies a lot from your 220V conventional), then I think that's the kind of situation where an AVR is helpful. Is it real that surge protectors hinder efficiency ? I do know the xbox needs https://johnathanybaba.collectblogs.com/78730728/an-unbiased-view-of-uninterruptible-power-supply-apc