Tripp lites smart500rt1u intelligent line interactive racktower uninterruptible power supply prevents data loss downtime and equipment damage due to power outages voltage fluctuations and transient surges requires only one rack space 1u in a 2 or 4 post rack with included accessories for upright tower placement large internal batteries offer 17 minutes half load runtime and 5 minutes at full load maintains regulated 120v nominal output without using battery power during brownouts as l