Vertiv Liebert PSI5 24V External Battery Cabinet | 2U Lead Acid 9 Ah

The Vertiv Liebert PSI5 24V External Battery Cabinet is engineered to dramatically extend the uptime of essential IT equipment by delivering reliable, scalable backup power. Designed to work hand-in-hand with Liebert PSI5 UPS models PSI5-800RT120 and PSI5-1100RT120, this 2U external battery solution provides a compact, space-efficient path to longer runtimes in data centers, server rooms, and network closets. Built around a 24V lead-acid battery system with a nominal capacity of 9 Ah, it delivers predictable power delivery to critical loads, enabling graceful shutdowns and sustained operation during outages. Whether upgrading an existing PSI5 deployment or planning a resilient infrastructure expansion, this external battery cabinet offers a streamlined, maintenance-friendly approach to power reliability.

• Compatibility and seamless integration: Specifically engineered to pair with the Vertiv Liebert PSI5 UPS models PSI5-800RT120 and PSI5-1100RT120, this external cabinet extends runtime without complex reconfiguration. The battery cabinet is designed to synchronize with the UPS’ power management, ensuring battery charging, discharge, and status reporting align with the overall system, so you can count on coordinated protection for critical servers, storage, and network devices.
• Compact 2U rack-mount design for space efficiency: With a slim 2U form factor, the cabinet fits neatly into standard 19-inch racks, helping you maximize data-center floor space while keeping essential components within easy reach. This compact footprint is ideal for dense environments where every rack unit counts, and it supports clean cable management and organized power distribution alongside the Liebert PSI5 UPS hardware.
• Lead-acid 9 Ah power pack for reliable backup: The cabinet houses a 24V lead-acid battery array rated at 9 Ah, delivering dependable energy storage for critical loads. This configuration provides a practical balance between runtime extension and weight, making it suitable for equipment that requires steady, predictable performance during short- and medium-length outages. The chemistry is chosen for established reliability in data-center environments, with maintenance and testing aligned to standard safety practices.
• Safe maintenance and straightforward battery replacement: The external cabinet design emphasizes safe access and uncomplicated maintenance procedures. When service is required, technicians can perform battery replacement and routine checks with minimal impact on uptime, helping data-center operators maintain continuous operations while refreshing energy storage capacity as needed.
• Enhanced monitoring and alarm capability: The battery cabinet works in concert with Liebert PSI5 monitoring features, providing real-time status indicators and alerts related to battery health, charge state, and runtime. This integration gives IT staff clear visibility into power readiness, enabling proactive maintenance and rapid response to abnormal conditions, so operations can continue with confidence during power anomalies.

Technical Details of Vertiv Liebert PSI5 24V External Battery Cabinet

• Model: Vertiv Liebert PSI5 24V External Battery Cabinet
• Chassis form factor: External battery cabinet designed to accompany the Liebert PSI5 UPS family
• Rack height: 2U
• Battery chemistry: Lead-acid
• Battery capacity: 9 Ah
• Nominal voltage: 24V
• Compatibility: Designed for use with PSI5-800RT120 and PSI5-1100RT120 UPS units
• Mounting: Internal 19-inch rack-mountable enclosure for streamlined installation
• Operational environment: Built for data-center and enterprise-grade environments requiring reliable backup power

How to install Vertiv Liebert PSI5 24V External Battery Cabinet

• Prepare the installation area by verifying a compliant 19-inch rack, adequate clearance for ventilation, and secure grounding per data-center best practices. Confirm that the UPS and the external battery cabinet share the same power path and are located within reach of required cables and management interfaces.
• If you are adding this cabinet to an existing PSI5 system, power down the UPS and related equipment following your facility’s safety procedures, then remove any front panel covers as needed for access. Ensure personnel follow lockout-tagout guidelines to prevent unexpected power restoration during installation.
• Mount the 2U external battery cabinet into the rack next to the Liebert PSI5 UPS unit, aligning the chassis with standard 19-inch mounting rails. Secure the cabinet with appropriate screws and verify that there is no interference with cabling or triggering hot-air convection paths that could affect performance.
• Connect the cabinet to the PSI5 UPS using the manufacturer-specified communication/power connectors. Route cables neatly to maintain proper airflow and prevent tripping hazards. Double-check that all connections are firmly seated and that protective covers are in place where required.
• Power up the UPS and cabinet, then use the Liebert monitoring interface to verify battery health, charge status, and runtime extension. Run a brief UPS self-check and review status indicators to confirm correct integration. Schedule a formal battery health assessment according to your maintenance plan to ensure ongoing reliability.

Frequently asked questions

• What is the purpose of the Vertiv Liebert PSI5 24V External Battery Cabinet? It provides additional energy storage to extend the runtime of the Liebert PSI5 UPS, enabling continued operation for connected critical IT equipment during power interruptions.
• Which UPS models are compatible with this external battery cabinet? The cabinet is designed for seamless pairing with the PSI5-800RT120 and PSI5-1100RT120 UPS units, ensuring synchronized charging, discharge, and monitoring.
• What is the battery type and capacity? The cabinet uses lead-acid batteries with a total capacity of 9 Ah at 24V, selected for reliable, established performance in data-center environments.
• What are the physical dimensions and form factor? The cabinet is a 2U, external, 19-inch rack-mountable unit intended to sit adjacent to or alongside the PSI5 UPS in a standard rack layout.
• How do I monitor battery health and runtime? The cabinet supports Liebert PSI5 monitoring features, offering status indicators and alerts for battery health, charge state, and runtime to help you manage reliability proactively.