Vertiv Liebert PSI5 UPS - 1100VA 990W 120V Line Interactive AVR Mini Tower UPS

The Vertiv Liebert PSI5 UPS delivers dependable, affordable power protection for today’s busy classrooms, home offices, and small workspaces. Engineered to safeguard computers, peripherals, networking gear, and media devices, this 1100VA UPS offers reliable battery backup and advanced voltage regulation at 120V. With a 0.9 power factor and a compact mini-tower form factor, the PSI5 combines robust performance with a space-saving footprint, making it an ideal choice for protecting critical equipment from outages, brownouts, surges, sags, and disruptive electrical noise.

• The PSI5 brings peace of mind with real-time protection for essential devices. Its 1100 VA/990 W capacity gives you ample battery-backed power to keep computers, monitors, and small networking gear running during short outages, while also absorbing disruptive spikes that can shorten equipment life. The 0.9 power factor means more usable watts for devices that demand higher current, helping you maximize the value of every amp-hour the UPS stores.
• Advanced voltage regulation at the heart of the Liebert PSI5 keeps your equipment safe from brownouts and voltage fluctuations. This line-interactive AVR technology continuously corrects abnormal voltages without unnecessarily draining the battery, delivering a steady, clean output to connected hardware and reducing the risk of unexpected shutdowns or data corruption.
• Space-saving, user-friendly design makes deployment effortless in desks, shelves, or small cabinets. The mini-tower footprint fits neatly in tight spaces used in classrooms, home offices, and small offices, while providing reliable surge protection and battery backup where you need it most. A compact chassis does not compromise performance, giving you enterprise-grade power protection in a value-focused package.
• Comprehensive protection against electrical disturbances extends the life of devices and preserves data. The PSI5’s power conditioning filters noise and suppresses transients, helping to shield sensitive electronics from erratic power, which can degrade components over time and lead to premature failures. This protection is particularly valuable for sensitive PCs, NAS drives, routers, and displays that demand clean, stable power.
• Easy, low-maintenance operation with clear status indicators supports quick setup and ongoing reliability. The PSI5 is designed for plug-and-play use with intuitive front-panel indicators that help you monitor battery health and operation at a glance. Its straightforward design minimizes downtime and simplifies routine checks, so you can focus on your work rather than power protection.

Technical Details of Vertiv Liebert PSI5 UPS

• Capacity: 1100 VA / 990 W
• Output voltage: 120 V
• Input voltage: 120 V
• Topology: Line-Interactive AVR
• Power factor: 0.9
• Form factor: Mini Tower

How to install Vertiv Liebert PSI5 UPS

• Place the UPS on a stable, well-ventilated surface away from heat sources and moisture.
• Plug the unit into a properly grounded 120V wall outlet. Avoid daisy-chaining through multiple power strips or extension cords.
• Connect essential devices to the UPS’s battery-backed outlets, ensuring the total load does not exceed the 990 W rating.
• Power on the UPS and verify that the front indicators display normal operation and sufficient battery charge.
• Consult the user manual for any optional power management software or advanced configuration if provided with your package, and set up automatic shutdown or alerts as needed.

Frequently asked questions

• Q: What does the Vertiv Liebert PSI5 UPS protect? A: It protects connected equipment from power outages, brownouts, surges, sags, and electrical noise, helping to prevent data loss and extend the life of your devices.
• Q: What is the capacity and what devices can it support? A: The UPS provides 1100 VA / 990 W of backup power and is suitable for essential computers, monitors, routers, and similar peripherals in small office or home office environments.
• Q: Does it have automatic voltage regulation (AVR)? A: Yes. The Liebert PSI5 uses line-interactive AVR to stabilize voltage without relying on the battery for normal fluctuations.
• Q: What is the expected runtime? A: Runtime depends on the load on the UPS. At lighter loads, you’ll get longer backup times; heavier loads will reduce runtime. For precise charts, consult the product manual or runtime tables provided by Vertiv.
• Q: Is this UPS suitable for a small classroom or home office? A: Absolutely. Its compact mini-tower design, reliable power conditioning, and robust protection make it well-suited for educational spaces, home offices, and small work areas.