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Do You Need A UPS? (Page 2)2. Line-Interactive UPS Hailed by some to be the most efficient UPS, the line-interactive UPS is one of the most popular designs used today for computer protection. Although some manufactures sell line-interactive UPSs which are no more than an offline UPS with a regulator added, the basic line-interactive UPS has a bi-directional inverter/charger which is always connected to the output of the UPS, and uses a portion of AC power to keep the battery charged. When the input power fails, the transfer switch disconnects AC input and the battery/inverter provides output power. This gives a faster response to a power failure than an offline UPS.
 Simplified Diagram of a "Line-Interactive" UPS |
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