Should your voltage concentrations are unstable (ie: power stays on, but the actual voltage stage differs lots within the 220V regular), then I feel that's the type of state of affairs exactly where an AVR is useful. This a few-phase approach minimizes AC-side sound significantly,⁵ so it is possible there https://andreszdavo.gynoblog.com/32972841/uninterruptible-power-supply-system-an-overview