P91 Li Lithium UPS (1000–3000VA, 120V) | Online Rack UPS

The P91 Li is a standard 2U lithium UPS designed for rack-based infrastructure where continuous conditioned power and predictable lifecycle performance are required.

Using Lithium Iron Phosphate (LiFePO₄) batteries, it provides long service life, reduced maintenance, and stable operation in elevated temperature environments compared to traditional VRLA systems.

The platform is optimized for internal runtime and flexible deployment, making it well suited for standardized installations across multiple sites.

P91 Li is often evaluated alongside lithium rack UPS platforms such as APC Smart-UPS Ultra in standard rack deployments.

Key Specifications

• 1000 / 1500 / 2000 / 3000 VA
• 120V single phase
• Online double-conversion topology
• Lithium Iron Phosphate (LiFePO₄)
• Rack / tower / wall deployment
• Up to 50 °C operation (derating above 40 °C)
• Internal battery runtime
• 6-year warranty (U.S. & Canada)

Datasheet:
https://xpcc.com/p91-li-1-5-3kva-flyer/

Rack-Level Power Protection

P91 Li is deployed in distributed infrastructure environments where localized UPS protection is required at the rack level.

Online double-conversion topology provides zero transfer time and continuous conditioned power, isolating connected equipment from upstream disturbances. Lithium battery architecture supports longer service intervals, improved thermal performance, and reduced maintenance compared to VRLA UPS systems.

Where P91 Li Fits

P91 Li operates as the standard lithium rack UPS platform within distributed infrastructure. It is typically deployed in network closets, IT racks, AV systems, and multi-site environments where a consistent UPS platform is required.

Within the Xtreme Power architecture, P91 Li sits between compact lithium platforms such as J60C and high-density platforms such as J90, providing a balance of flexibility, runtime, and standard rack deployment.

P91 Li vs High-Density Lithium UPS

P91 Li is designed for standard rack environments where internal runtime and flexible deployment are required.

Compared to high-density platforms such as J90, it uses a 2U form factor suited for conventional racks and supports rack, tower, or wall installation. J90 is typically selected when rack space is constrained, outlet-level switching is required, or extended runtime lithium configurations are needed.

P91 Li vs Other Lithium Rack UPS Platforms

(keep your comparison table here)

View detailed model comparisons →
https://xpcc.com/p91-li-ups-comparisons/

Lithium UPS Lifecycle Advantages

Lithium UPS systems provide lifecycle advantages compared to VRLA systems, including longer service life, improved thermal performance, and reduced maintenance requirements.

LiFePO₄ battery systems are designed for long lifecycle performance, with up to 15-year battery life under ideal operating conditions.

Learn more:
https://xpcc.com/lithium-ups-guide/

Rack Integration and Power Distribution

P91 Li is typically deployed with rack-mounted power distribution and integrates with intelligent PDUs for monitoring and control.

It pairs with Xtreme Power SPDUs to support standardized rack power architecture, remote monitoring, and outlet-level control across distributed deployments.

Learn more about smart PDUs:
https://xpcc.com/smart-pdu/

Runtime Architecture

P91 Li uses an internal battery architecture designed for short-duration ride-through, controlled shutdown, and standardized deployment across multiple sites.

It is not intended for long-duration runtime applications, where external battery or facility-level UPS systems are more appropriate.

When to Use P91 Li

P91 Li is typically selected when lithium UPS is preferred over VRLA, when internal runtime is sufficient, and when a standardized rack deployment platform is required across multiple locations.

It is particularly well suited for environments operating at elevated temperatures where lithium performance advantages are important.

Replace APC and Eaton Lithium UPS

P91 Li is commonly deployed as a replacement for lithium rack UPS systems from APC, Eaton, and Vertiv.

It provides a consistent lithium platform with predictable lifecycle performance and high-temperature operation up to 50 °C.

Explore comparisons:
https://xpcc.com/p91-li-ups-comparisons/

Typical Applications

P91 Li is deployed across network closets, AV systems, telecommunications infrastructure, and distributed IT environments.

It is particularly well suited for IDF/MDF deployments and multi-site infrastructure where a consistent and maintainable UPS platform is required.

Explore related applications:

https://xpcc.com/ups-for-idf-mdf-closets/

Capacity Guidance

Capacity selection is based on load profile:

• 1000 VA → network switching and edge devices
• 1500 VA → small server and telecom nodes
• 2000 VA → distributed IT and AV systems
• 3000 VA → higher-density rack deployments

Technical Summary

• Topology: Online double conversion
• Capacity: 1000–3000 VA
• Voltage: 120V
• Battery: LiFePO₄ (internal)
• Form Factor: Rack / tower / wall
• Runtime: Internal
• Monitoring: Optional SNMP

Plan With Confidence

Xtreme Power Conversion supports UPS selection, lifecycle planning, and distributed infrastructure design for lithium rack UPS deployments.

Phone: (800) 582-4524
Email: sales@xpcc.com