This once was the dominant form of UPS and it is limited to across the a hundred and fifty kVA assortment. These units are still mostly employed in a few industrial options (oil and gasoline, petrochemical, chemical, utility, and large marketplace marketplaces) due to strong mother nature with the UPS. https://israelslddo.blogsuperapp.com/34342918/the-definitive-guide-to-uninterruptible-power-supply-review