This once was the dominant type of UPS and is particularly limited to across the 150 kVA range. These models are still predominantly employed in a few industrial configurations (oil and gasoline, petrochemical, chemical, utility, and heavy field markets) mainly because of the strong character with the UPS. From Java https://wordpress59379.isblog.net/the-smart-trick-of-ups-uninterruptible-power-supply-that-no-one-is-discussing-50964052