In case your voltage ranges are unstable (ie: power stays on, but the actual voltage stage differs a whole lot from the 220V typical), then I believe that's the sort of state of affairs exactly where an AVR is useful. This a few-phase method lowers AC-facet noise considerably,⁵ so it https://trentonnohzr.iyublog.com/32982010/uninterruptible-power-supply-fundamentals-explained