The CRN Test Center, a center operated by CRN, a major computer industry trade paper, has tested eight uninterruptible power supplies (UPS) and determined there are some real differences. It gave its top rating to the APC Smart-UPS 1400, a rack-mounted line interactive UPS with 1,400 VA of backup power at a price of $849. A line interactive UPS simply monitors the AC line and kicks in battery power only when the AC input falls outside set margins. In contrast, an online UPS continuously provides power from the batteries, which are constantly kept fully charged by the AC input. The top-rated online UPS, the Tripp Lite SU2200RT2U, was rated second overall. Details of the tests are available at the test center's Web site.
[Contact: CRN Test Center; Web: www.crn.com/testcenter.]