Vertiv Liebert PST5 UPS 660VA/400W - Compact Battery Backup

In this review of the Vertiv Liebert PST5 UPS 660VA/400W, the bottom line is simple: this is a compact, energy-efficient backup solution well suited for home offices and single-workstation setups that need short, reliable run time to save work and perform an orderly shutdown. Setup is straightforward and the unit's combination of battery backup and surge protection is the single biggest reason to buy, since it protects both hardware and data during short outages while offering built-in communications for managed shutdowns.

Key Features

• Battery backup and surge protection: Provides uninterrupted power to connected devices during outages and guards against damaging surges and spikes so equipment can be safely shut down.
• Eight outlets: Offers eight NEMA 5-15R outputs with four dedicated to battery plus surge and four for surge-only, letting noncritical devices remain protected without drawing battery power.
• Spaced transformer outlets: Two widely spaced outlets accommodate transformer-block plugs without blocking adjacent outlets for better usability.
• Data line protection: Includes RJ45/RJ11 surge protection for telephone or network data lines to reduce the chance of line-borne surges damaging connected equipment.
• Energy efficient design: Energy Star certified construction reduces environmental impact and can lower idle power consumption in always-on home or small office environments.
• Communications and warranty: USB communication allows notification and controlled shutdown via free software, and a 3-year full unit warranty simplifies service concerns.

Who It's For

This UPS is best for home computer users, small home offices, gamers, and owners of a single desktop workstation who need short-term runtime to save work and close applications safely during brief outages. Its compact size and Energy Star certification make it a reasonable choice where space and efficiency matter.

It is less suitable for larger office racks, multiple-server environments, or users who require long run times for several devices; those buyers should look for higher-capacity or true online UPS systems with extended battery options and higher wattage ratings.

Pros & Cons

Pros

• Reliable combination of battery backup and surge protection for desktop systems and network equipment.
• Eight outputs with two widely spaced outlets for transformer plugs improves practical usability.
• Energy Star certification and USB communications provide efficient operation and managed shutdown capability.
• Three-year full unit warranty with advanced replacement offers strong coverage for peace of mind.

Cons

• Some users report mixed experiences with battery life and occasional power loss on backup outlets, so expect typical standby UPS limitations rather than unlimited runtime.
• Not intended for high-load or multi-server setups where longer runtime or higher wattage is required.

Specifications

Model	PST5-660MT120 (Vertiv Liebert PST5)
Capacity	660VA / 400W
Input	NEMA 5-15P, 6 ft cord
Outputs	(8) NEMA 5-15R - 4 battery+surge, 4 surge-only; 2 widely spaced
Data line protection	RJ45/RJ11 network/phone surge protection
Features	LCD screen, USB communications, free shutdown software
Certification & Warranty	Energy Star certified; 3-year full unit warranty with battery coverage

Our Verdict

The Vertiv Liebert PST5 660VA UPS is a sensible, value-minded choice for single desktops, gaming PCs, and home networking gear that need short-term backup and surge protection. It combines practical outlet layout, Energy Star efficiency, and useful communications in a compact package, making it a worthwhile buy for users who want reliable shutdown capability without investing in larger UPS systems.

Frequently Asked Questions

How many devices can this UPS support?
It has eight outlets and can support several peripherals and a desktop within the 400W limit, but runtime depends on the combined load.

Does it work with shutdown software?
Yes, the unit provides USB communications and free shutdown software for notifications and controlled shutdowns.

Is this suitable for servers?
It is intended for home and small office electronics; larger servers or multi-device racks should use higher-capacity UPS systems with extended runtime options.