A UPS process with on the net double-conversion topology (and generator mode) will constantly filter soiled power and deliver cleanse AC output power. Soiled power is noisy, which produces a jagged sine wave but helps prevent utmost power output. Load bank testing may also help melt away from the leftovers https://israelnrvze.ampedpages.com/little-known-facts-about-backup-power-generator-home-56728703