This at the time was the dominant kind of UPS and is also restricted to across the a hundred and fifty kVA assortment. These units are still primarily used in some industrial configurations (oil and fuel, petrochemical, chemical, utility, and weighty field marketplaces) due to robust nature of the UPS. https://waylon0k67q.widblog.com/88753134/ups-uninterrupted-power-supply-secrets