Vertiv PSI5-800SRT2ULIN Lithium-Ion 800VA 2U Rack/Tower UPS
Overview
The PSI5-800SRT2ULIN is Vertiv's Liebert PSI5 Lithium 800VA/720W short-depth UPS built for edge IT closets, distributed network nodes, and security infrastructure racks where a full-depth unit won't fit and battery longevity matters. At 11.81 inches deep, it slides into shallow 2-post telecom racks or wall-mount enclosures that reject standard 18–24" units. The LiFePO4 (lithium iron phosphate) chemistry is the core differentiator here: lithium-ion batteries carry a 10-year design life versus 3–5 years for VRLA, survive wider operating temperature swings without derating, and ship air-freight without hazmat restrictions — meaningful when you're deploying to remote branch closets or edge sites. The unit includes a Vertiv Liebert RDU120 network management card out of the box, eliminating the $200+ add-on cost typical of competing lines. Pure sine wave output (not simulated) protects active PFC power supplies in modern servers, NVRs, and PoE switch arrays from the waveform distortion that trips over-current protection. At 98.4% efficiency in online double-conversion mode, it generates less heat than legacy UPS designs — a real factor in compact enclosures with limited airflow. Runtime is 20 minutes at half load (360W) and 9 minutes at full load (720W) — sized for graceful shutdown, not extended runtime. Six NEMA 5-15R outlets provide direct connection for network video recorders, PoE switches, and access control panels without a PDU intermediary.
Compatibility
Fits any standard 2U rack space with at least 11.81" of usable depth — suitable for 2-post open-frame and 4-post enclosed cabinets. Wall-mount bracket is included, making it a direct fit for on-wall network enclosures common in access control and small surveillance deployments. Connects to any load device via NEMA 5-15R plugs; 120VAC output is user-selectable to 100/110/115/125V to match regional equipment tolerances. The RDU120 NMC supports SNMP, Modbus, and BACnet, integrating with Vertiv Liebert power management software, most third-party DCIM platforms, and BACnet-enabled building automation systems. USB port enables direct communication with Windows, Linux, and macOS shutdown agents. Optional Liebert Intellislot cards (sold separately) extend connectivity to additional power protection protocols. Hot-swappable battery design means battery replacement on a live system without load transfer to bypass — relevant for always-on surveillance camera infrastructure that cannot tolerate planned downtime. Meets UL 1778 5th Edition, UL1973 3rd Edition, and CSA C22.2 107.3-14; Energy Star Certified.
Installation Notes
Operating temperature range is 32°–104°F (0°–40°C) with no derating across the full span — unlike VRLA-based units that lose capacity above 77°F, this holds rated capacity in warm IDF closets. Unit weight is 18.5 lbs; single-technician rack mounting is feasible without a lift. The gravity-sensing LCD auto-orients between rack and tower positions — no manual display reconfiguration required when changing form factor. EPO (Emergency Power Off) port enables integration with raised-floor or room-level EPO systems. Programmable outlet groups allow staged shutdown sequencing across connected loads.
