Tripp lites smx1500xlrt2u 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 two rack spaces 2u in a standard rack enclosure large internal batteries offer 25 minutes half load runtime and 10 minutes at full load runtime is expandable with optional bp36v15 2u external battery pack maintains regulated 230v nominal output without using battery po