Vertiv Liebert PSI5 UPS - 1100VA/990W 120V | Line Interactive AVR Tower/Rack Mount

The Vertiv Liebert PSI5 UPS delivers dependable, intelligent power protection for your essential electronics. With a capacity of 1100 VA / 990 W and a 120V output, this line-interactive uninterruptible power supply is engineered to shield critical devices from outages, brownouts, surges, and other power disturbances. Designed for versatility, the PSI5 combines a compact form factor with flexible mounting options, allowing you to deploy it as a compact tower or leverage a 19-inch rack installation to fit neatly into a server room, IT closet, or home office. This makes the Liebert PSI5 a practical choice for workstations, small business equipment, home entertainment systems, networking gear, and compact servers that require reliable power protection and data integrity.

Power quality matters, and the PSI5 is built to maintain clean, regulated power for your gear. The line-interactive AVR (Automatic Voltage Regulation) topology stabilizes fluctuating input voltages without draining the battery, minimizing battery wear and extending run-time for essential devices. In the event of a blackout, the UPS seamlessly switches to battery power, giving you time to save work and shut down safely, thereby reducing the risk of data loss. Beyond protecting electronics, the PSI5 helps prevent premature equipment failure caused by voltage spikes, sags, and other electrical anomalies that can occur in homes, offices, and small data environments.

Whether you’re outfitting a home office, a small business workstation, or a compact network rack, the PSI5’s design focuses on easy installation, quiet operation, and long-term reliability. Its robust protection features are complemented by straightforward management options, enabling you to monitor status, perform safe shutdowns, and plan maintenance with confidence. The result is a dependable power partner that minimizes downtime, preserves data, and keeps your essential systems accessible when it matters most.

• Reliable power protection for critical devices: The Liebert PSI5 provides dependable battery-backed power for a range of essential equipment. With a capacity of 1100 VA / 990 W, it can support a workstation, monitor, external storage, a router, and other peripherals during outages, helping you avoid abrupt shutdowns and potential data loss. The UPS shields your gear from surges and spikes, preserving sensitive components and maintaining system integrity during power disturbances.
• Line-Interactive AVR for smarter voltage regulation: Automatic Voltage Regulation (AVR) stabilizes fluctuating mains voltages in real time, delivering clean, usable power without exhausting the battery. This means you’ll see fewer unexpected reboots and smoother operation even when the electrical supply is inconsistent, reducing wear on power supplies and extending hardware longevity.
• Flexible installation for tower or rack-mount setups: The PSI5 is designed for versatile deployment. Install it as a compact tower for a desk or floor space, or convert it for a 19-inch rack-mount configuration with the appropriate mounting hardware. This flexibility makes it suitable for home offices, small IT closets, or clean, space-conscious work areas where a traditional large UPS wouldn’t fit.
• Easy monitoring and safe shutdown capability: With built-in connectivity options, you can monitor the UPS status and coordinate safe shutdowns of connected systems when power events occur. USB connectivity typically enables power management software to automate backups and preserve work, helping protect data integrity across devices and applications critical to daily operations.
• Compact design with efficiency in mind: The Liebert PSI5 combines robust protection with a compact footprint, enabling it to fit into small spaces while maintaining reliable performance. Its efficient operation helps reduce energy waste and heat generation, contributing to a quieter workspace and lower operating costs over the device’s lifetime.

Technical Details of Vertiv Liebert PSI5 UPS

• Capacity: 1100 VA / 990 W
• Output Voltage: 120 V
• Topology: Line-Interactive AVR
• Form Factor: Tower or Rack-Mount capable (rack-mount kit recommended for 19-inch installations)
• Protection: Surge suppression and battery-backed power during outages
• Communications: USB connectivity for monitoring and safe shutdown
• Mounting: Tower or rack-mount compatible via standard hardware
• Operating Environment: Details on temperature and humidity are not specified here
• Warranty: Specific terms are not provided in this description

How to Install Vertiv Liebert PSI5 UPS

Preparing the installation begins with a suitable location. Choose a cool, well-ventilated space away from heat sources and moisture. Ensure there is adequate clearance around the unit to allow for proper air circulation and easy access to ports and outlets. The PSI5’s adaptable form factor enables you to position it as a compact tower on a desk or shelf, or place it in a rack using the appropriate mounting kit. If you plan a rack-mount setup, install the rack brackets and secure the unit firmly to avoid movement during operation.

Once mounted, connect the devices you want to protect to the UPS’s surge-protected outlets. Prioritize mission-critical equipment—such as your computer, monitor, external storage, and network equipment—so they benefit from battery backup during an outage. Do not overload the UPS beyond its rated capacity, as this could compromise its ability to provide adequate runtime or protect connected gear.

Next, connect the UPS to a properly grounded 120V wall outlet. Verify the outlet can handle the UPS input current and that the circuit is protected by a breaker suitable for your total load. With power connected, you can connect an optional USB cable between the UPS and a computer for monitoring and safe shutdown. Install any manufacturer-provided power management software to enable automatic shutdowns, event logging, and status alerts. Configure your preferred alert tones, LCD indicators, and notification methods so you’ll be aware of power events as they occur.

Test the configuration to confirm proper operation. Simulate a power outage by taking the wall outlet offline momentarily and observe that the protected devices transition smoothly to battery power and back when power is restored. Confirm that the safe shutdown sequence runs as expected when you initiate a test or actual outage. Regularly test the unit to ensure batteries retain charge and the system responds promptly during real events. If your environment requires longer run times, plan for battery replacement at the manufacturer’s recommended intervals and follow the included maintenance guidelines.

Finally, document the installation for future reference. Note the equipped outlets, the connected devices, and the expected runtime for common load scenarios. Maintain clean power conditions by keeping the area free of dust and ensuring the UPS is not placed in direct sunlight or near heat sources. This careful setup will maximize the lifespan and performance of your Vertiv Liebert PSI5 UPS and help you protect critical assets effectively.

Frequently Asked Questions

• What devices does the Vertiv Liebert PSI5 UPS protect? It protects essential electronics such as a workstation or desktop computer, monitor, networking gear (router, switch), external storage devices, and other critical peripherals that require surge protection and reliable power during outages. By providing battery-backed power for downtime moments, it helps prevent data loss and abrupt interruptions.

• What is the typical run-time at 50% load? Runtime varies with the total load and the condition of the battery. At moderate load, many customers experience several minutes of runtime, enabling you to save work and shut down safely. For precise runtimes under your specific load, consult the official specification sheet or run a practical test in your environment.

• Is the PSI5 compatible with rack installations? Yes. The unit is designed for both tower and rack-mount installations. If you plan to rack-mount it, use the appropriate mounting kit to secure the UPS in a standard 19-inch rack. This makes it suitable for compact IT closets, small data centers, or dedicated media rooms where space efficiency is important.

• Does it provide automatic voltage regulation (AVR)? Yes. The Liebert PSI5 employs AVR to correct minor voltage fluctuations without drawing on the battery, helping conserve battery life and extend uptime for connected devices during fluctuating power conditions.

• How can I monitor the UPS and perform safe shutdowns? The PSI5 offers USB connectivity for monitoring and safe shutdown by using manufacturer-provided software. Install the software on a connected computer to receive notifications, log events, and automate orderly shutdowns when a power event is detected.

• What maintenance is required? Regular checks on battery health and firmware/software updates (if available) help ensure optimal performance. Follow the manufacturer’s maintenance guidelines for battery replacement intervals and recommended service checks to maintain reliability over time.