Vertiv Liebert PSI5 1500MT120LI 1,350 W Lithium-Ion UPS | Tower

Keep essential infrastructure online with the Vertiv Liebert PSI5 Lithium-Ion 120V UPS. Designed for network equipment, servers, and mission-critical systems, this 1,350 W, 1,500 VA tower UPS delivers the power conditioning and runtime needed to ride through outages and stabilize inconsistent utility power. Automatic voltage regulation helps correct common voltage fluctuations without immediately switching to battery, preserving battery capacity for real interruptions. The lithium-ion battery platform is a strong fit for IT teams that want longer service life and less maintenance overhead than conventional battery designs. With 8 minutes of backup at full load and 18 minutes at half load, it provides practical runtime for controlled shutdowns or generator transfer. This model also includes RJ-11/RJ-45 dataline protection, an EPO port, and a 10 ft cord, making it a practical choice for compact server rooms, branch offices, and edge deployments where both power and signal protection matter. For buyers comparing UPS options, the PSI5 Lithium-Ion stands out by pairing enterprise-grade power conditioning with a smaller footprint and lower lifecycle friction.