Vertiv Liebert PSI5 72V External Battery Cabinet – 9Ah Lead-Acid, TAA Compliant

The Vertiv Liebert PSI5 72V External Battery Cabinet (PSI5-72VBATTTAA) is a purpose-built, government-friendly extension to your Liebert PSI5 UPS ecosystem. This 9 Ah lead-acid external battery enclosure is designed to deliver longer runtimes for critical devices, enabling businesses to bridge outages, protect sensitive data, and maintain operation through brief power interruptions. Built to integrate seamlessly with compatible Liebert PSI5 UPS models, this cabinet expands backup capacity without increasing the footprint of the core UPS, helping data centers, network closets, and remote sites optimize uptime with a scalable, reliable power strategy.

• Longer runtime for essential equipment: The 72V external battery cabinet adds capacity to your Liebert PSI5 system, enabling extended backup for servers, networking gear, storage devices, and other critical loads. By providing additional energy storage outside the main UPS chassis, you can preserve uptime during longer outages or brief power quality disturbances, giving IT teams more time to gracefully manage shutdowns or switch to alternative power sources.
• TAA-compliant for government and contractor procurement: This cabinet is designed to meet Trade Agreements Act requirements, making it suitable for federal, state, and defense-related deployments. With TAA compliance, organizations can simplify purchasing processes and ensure alignment with public-sector procurement guidelines while maintaining enterprise-grade reliability.
• Proven lead-acid reliability in a compact external enclosure: Utilizing 9 Ah lead-acid cells, the battery cabinet pairs established, low-maintenance chemistry with a robust external enclosure. This combination provides dependable storage for backup scenarios while offering a familiar maintenance cycle and replacement cadence that many data-center teams already manage across existing battery assets.
• Designed for seamless PSI5 integration (PSI5-3000RT120 and PSI5-5000RT208): The external cabinet is engineered to work with specific Liebert PSI5 UPS models, delivering streamlined deployment with minimal cabling and configuration. This compatibility ensures you can expand runtime without introducing complex adapters or bespoke interconnects, preserving system footprint and simplifying support.
• Easy installation, maintenance, and monitoring: The external cabinet is built with serviceability in mind, featuring clear labeling, straightforward interconnects, and accessibility for inspection and battery health checks. Regular maintenance aligns with standard UPS battery practices, enabling proactive health monitoring and timely replacement to keep critical systems online during power events.

Technical Details of Vertiv Liebert PSI5 72V External Battery Cabinet

• Model: PSI5-72VBATTTAA
• Voltage: 72V
• Battery chemistry: Lead-Acid
• Capacity: 9 Ah
• Type: External Battery Cabinet
• Compliance: TAA (Trade Agreements Act) compliant
• Compatibility: PSI5-3000RT120, PSI5-5000RT208

How to Install Vertiv Liebert PSI5 72V External Battery Cabinet

Installing the PSI5 72V External Battery Cabinet is a straightforward process designed to minimize downtime and maximize uptime. Follow these general steps to integrate the external cabinet with a compatible Liebert PSI5 UPS system:

1) Verify compatibility and prepare the site. Confirm that your Liebert UPS model is either PSI5-3000RT120 or PSI5-5000RT208 and that the external cabinet is the correct PSI5-72VBATTTAA unit for your configuration. Choose a cool, dry, well-ventilated location with stable access for maintenance. Ensure there is adequate clearance around the cabinet for air flow, inspection, and cable routing, and verify that the mounting surface can support the combined weight of the UPS and the external cabinet when fully loaded.

2) Power down and de-energize. Safely shut down the UPS as per the manufacturer’s procedures and disconnect from the mains power source. This reduces the risk of electric shock or arc flash during connections. If your facility requires coordination with other equipment, schedule a controlled power-down window to minimize impact on network services.

3) Position and connect. Place the external battery cabinet in the designated area and align connector points with the UPS enclosure. Attach the interconnect cables between the PSI5 UPS and the external cabinet following the Liebert installation guide. Ensure correct polarity and secure all connectors to prevent loosening due to vibration or movement. Double-check cable routing to avoid kinks, abrasion, or interference with hot components.

4) Verify safety and integrity. With cabling complete, re-secure access panels and verify there are no exposed conductors. Confirm that ventilation paths remain unobstructed and that the battery cabinet is stable. Some setups may require a firmware or software check to recognize the extended battery capacity—follow the UPS software prompts to initialize the new runtime data and confirm the system acknowledges the added 9 Ah capacity.

5) Restore power, test, and document. Reconnect the mains supply and power up the UPS. Conduct a controlled battery discharge or test routine as recommended by Vertiv to verify that the extended runtime is functional and that the system reacts correctly to simulated outages. Monitor the UPS status through the management interface and record the results, including runtime estimates and battery health indicators, so future maintenance cycles are data-driven and predictable.

6) Establish maintenance cadence. Implement a routine inspection schedule for the external cabinet, focusing on battery aging, terminal connections, and cabinet integrity. Replace lead-acid batteries following the manufacturer’s guidance or when health indicators show declining performance. Maintain a spare parts plan to minimize downtime during replacement, and ensure all safety and environmental requirements for handling batteries are observed.

Frequently Asked Questions

• Q: What is the capacity and voltage of the Vertiv Liebert PSI5 72V External Battery Cabinet?
  A: It is a 72V external battery cabinet with a 9 Ah lead-acid battery capacity, designed to extend runtime for compatible Liebert PSI5 UPS systems.
• Q: Which UPS models are compatible with this external cabinet?
  A: The PSI5-3000RT120 and PSI5-5000RT208 UPS models are designed to work with the PSI5 72V external battery cabinet.
• Q: Is the cabinet compliant with the Trade Agreements Act (TAA)?
  A: Yes, the cabinet is TAA-compliant, making it suitable for government procurement and similar deployments.
• Q: Is this cabinet a standalone UPS or an accessory?
  A: This is an external battery cabinet intended to extend the runtime of compatible Liebert PSI5 UPS systems, not a standalone UPS.
• Q: How should I maintain the battery cabinet for long-term reliability?
  A: Regular inspections, proper ventilation, clean connections, and adhering to a scheduled maintenance plan for lead-acid batteries will help maintain performance and extend the service life. Replace aging batteries according to the manufacturer’s guidelines.