Liebert PSI5 800 Vertiv 990 W 120 VAC UPS | Rack Mount, AVR

Maintain uptime for network closets, edge servers, and workstation-critical loads with the Vertiv Liebert PSI5 800. This 2U rack/tower convertible UPS is designed to stabilize incoming power with AVR, helping sensitive equipment ride through common voltage fluctuations without unnecessary battery use. With 990 W of output capacity at 800 VA, it is sized for smaller infrastructure footprints where clean power and fast recovery matter more than bulk capacity. The 120 VAC design fits standard North American deployments, while the convertible form factor gives teams flexibility during refreshes, relocations, or mixed rack and floor installations. A 3-minute standby runtime is intended for short interruptions, enough to preserve sessions, complete controlled shutdowns, or bridge to generator transfer in tightly managed environments. For organizations that value predictable protection over oversized runtime, this model delivers a focused balance of capacity, conditioning, and deployment flexibility. Choose it when you need dependable power protection for equipment that cannot tolerate even brief instability, but does not require extended battery autonomy. It is a practical fit for branch IT, small server rooms, and distributed infrastructure where every rack unit and every minute of uptime count.