In case your voltage concentrations are unstable (ie: power stays on, but the particular voltage amount varies quite a bit from your 220V normal), then I think that's the sort of state of affairs in which an AVR is useful. That UPS's output excellent is just not base from the https://andy2456t.tblogz.com/new-step-by-step-map-for-uninterruptible-power-supply-ups-47384592