This after was the dominant type of UPS and is particularly limited to within the a hundred and fifty kVA array. These units are still primarily used in some industrial settings (oil and fuel, petrochemical, chemical, utility, and heavy field markets) because of the strong mother nature of the UPS. https://google-sites16936.fitnell.com/74603118/ups-uninterruptible-power-supply-things-to-know-before-you-buy