Vertiv Liebert PSI5 72V External Battery Cabinet – 9 Ah VRLA Lead-Acid

Power reliability is non-negotiable for modern IT environments, and the Vertiv Liebert PSI5 72V External Battery Cabinet delivers a scalable solution that protects your critical infrastructure. This 72V external battery cabinet is designed to extend runtime for Vertiv Liebert PSI5 UPS models, specifically the PSI5-3000RT120 and PSI5-5000RT208, by providing additional energy storage in a compact, maintenance-free package. Built around valve-regulated lead-acid (VRLA) chemistry, the cabinet pairs safety and performance with ease of integration, giving IT managers a dependable way to safeguard servers, storage, and networking gear against power interruptions. The combination of 72V nominal voltage and a 9 Ah capacity means you can achieve meaningful runtime improvements for mid-range workloads without overhauling your existing UPS baseline. In practice, this external battery cabinet acts as a modular extension to your Liebert PSI5 system, letting you tailor backup power to the specific demands of your data center, edge location, or remote office.

Engineered for IT applications where uptime is paramount, the PSI5 72VBATT external cabinet supports flexible deployment scenarios. Its compact form factor makes it suitable for dense data center racks as well as space-constrained rooms, and it is compatible with both rackmount and tower configurations. VRLA chemistry provides a sealed, maintenance-free solution that minimizes the need for frequent battery maintenance while offering reliable operation in a variety of environmental conditions. The external cabinet is designed to work hand in hand with Liebert AVR line-interactive technology, helping to stabilize voltage during irregular power events, suppress transients, and reduce the likelihood of brownouts impacting critical equipment. This protection translates to safer operation, reduced risk of data loss, and lower overall downtime costs, which are crucial differentiators for businesses relying on consistent IT performance.

Beyond just providing extra runtime, the 72V external battery cabinet embodies a strategic upgrade path for growing IT environments. Organizations can scale their backup capacity as workloads expand, without replacing the primary UPS unit. This approach preserves capital while delivering measurable improvements in availability and service levels. The cabinet’s VRLA design also means fewer maintenance headaches and a lower total cost of ownership over the life of the system, making it an attractive option for data centers, enterprise IT rooms, and edge deployments where power reliability is critical. In addition, the external nature of the battery cabinet reduces strain on the main UPS, enabling it to manage fluctuations and outages more effectively while preserving battery health through proper charge control. For administrators, this translates into a simpler, more predictable path to higher uptime, improved data protection, and a resilient IT footprint that can weather outages without sacrificing performance.

• The 72V external battery cabinet provides an immediate runtime extension for Vertiv Liebert PSI5 UPS units, delivering 72V and 9 Ah of VRLA energy storage to support essential workloads during outages and power irregularities.
• Valve-regulated lead-acid (VRLA) battery chemistry delivers a sealed, maintenance-free energy source with reduced risk of leakage, enabling safer operation in dense data centers and utility-managed spaces while preserving battery health under normal operating conditions.
• Flexible mounting options—including rackmount compatibility for standard 19-inch racks and a tower form factor—make installation straightforward in a variety of IT environments, from traditional data centers to remote office locations.
• Designed specifically for compatibility with the PSI5-3000RT120 and PSI5-5000RT208 UPS models, ensuring seamless integration, coordinated charging, and coordinated runtime management within the Liebert PSI5 ecosystem.
• By complementing Liebert AVR line-interactive technology, the 72VBATT cabinet helps damp voltage fluctuations, suppress transients, and enhance overall power quality, contributing to improved equipment protection and uptime across critical IT services.

Technical Details of Vertiv Liebert PSI5 72V External Battery Cabinet

• Compatibility: PSI5-3000RT120 and PSI5-5000RT208 UPS models
• Battery Type: Valve-Regulated Lead-Acid (VRLA)
• Nominal Voltage: 72V
• Capacity: 9 Ah
• Form Factor: External Battery Cabinet
• Mounting: Rackmount or Tower
• Safety/Design: Sealed, maintenance-free enclosure designed for reliable operation in data centers and edge environments

How to install Vertiv Liebert PSI5 72V External Battery Cabinet

Installing the 72V external battery cabinet is a straightforward process that enhances your Liebert PSI5 UPS capabilities. Follow these general steps to integrate the cabinet with your existing system:

• Prepare the installation area: Ensure adequate ventilation, clean power environment, and accessible space for both the exterior cabinet and the main PSI5 unit. Confirm that the room meets the environmental specifications recommended by Vertiv for temperature and humidity.
• Power down the UPS system: For safety and to prevent data loss, switch off the Liebert PSI5 UPS and disconnect it from any connected loads before beginning the installation process.
• Choose mounting configuration: Decide between rackmount placement in a standard 19-inch rack or an upright tower installation based on your space and data center layout. Secure the cabinet using the appropriate mounting hardware supplied with the kit, following best practices for weight distribution and airflow.
• Connect to the PSI5 UPS: Use the supplied cables and connectors to link the external battery cabinet to the PSI5 UPS, ensuring a secure and correct polarity connection. Refer to the user manual for the exact connector locations and any required jumper settings or communication links to synchronize charging and runtime management.
• Power on and validate: Reconnect loads and power, then run a basic battery test or a simulated outage to verify that the external cabinet delivers the expected runtime and that the Liebert AVR function continues to stabilize voltage under load. Monitor the system through the Liebert management interface to confirm health, charge status, and overall performance.

Frequently asked questions

• What is the Vertiv Liebert PSI5 72V External Battery Cabinet? It is a 72V external battery extension for compatible Liebert PSI5 UPS units, using 9 Ah of valve-regulated lead-acid (VRLA) cells to extend backup runtime for critical IT equipment.
• Which UPS models are compatible with this external cabinet? The cabinet is designed to work with the PSI5-3000RT120 and PSI5-5000RT208 models, providing seamless integration and coordinated power management within the Liebert PSI5 family.
• Is the VRLA battery in the cabinet maintenance-free? Yes. VRLA batteries are sealed and designed for minimal maintenance, with internal recombination gases and a sealed enclosure to reduce leakage risks and simplify upkeep.
• Can I install the cabinet in a rack or as a tower? Yes. The design supports both rackmount and tower configurations, allowing flexible deployment to fit your data center layout and space constraints.
• How does this cabinet affect run-time and protection? By adding 9 Ah at 72V, the cabinet increases available backup time during outages for critical workloads. It also contributes to power quality protection when used with Liebert AVR, helping mitigate voltage fluctuations and transient spikes that can threaten IT equipment.