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=== For the Impatient: How Much Protection You Need ====== For the Impatient: How Much Protection You Need ==='''On-line''' UPS systems employing double conversion topology, not delta conversion or ferroressonant, are the only true on-line types. The on-line UPS is constantly engaged, converting all incoming power to DC current which passes though the battery circuit (DC bus) and is converted back to AC again. Equipment connected to the on-line UPS is electrically isolated from utility power and receives continued highly regulated power. This design prevents any output power disturbance or gap when there is utility power loss or an anomaly in the incoming power since the battery circuit is always engaged. An on- line UPS can accept as low as 50% normal incoming voltage without drawing battery power, greatly increasing battery life. Liebert single phase on-line UPS systems have hot swappable batteries that typically last (5) years.[[File:ups-tripplite.jpg]][[File:ups-tripplite.jpg]]