P91 Online UPS – 1000–3000 VA, 120V Rack/Tower UPS with Scalable Runtime

The P91 Series is a double-conversion online UPS designed for applications where uptime, voltage stability, and runtime flexibility are required in a compact form factor.

With integrated batteries and optional external battery packs, P91 supports runtime from minutes to extended durations while maintaining zero transfer time and stable output for sensitive electronic systems.

Key Specifications

• 1000 / 1500 / 2000 / 3000 VA
• 120V single phase
• Online double-conversion topology
• Unity output power factor (0.9–1.0)
• Internal batteries with external expansion capability
• 2U rack / tower convertible
• Optional SNMP / web-based monitoring
• TAA compliant

Datasheet:
https://xpcc.com/wp-content/uploads/P91-1-3kVA-Flyer.pdf

Scalable Runtime and Continuous Power Protection

P91 is built around a runtime-flexible architecture. Internal batteries provide standard ride-through, while external battery packs allow runtime to be extended based on application requirements.

Online double-conversion topology continuously conditions incoming power, isolating connected equipment from voltage disturbances, frequency variation, and electrical noise. During outages, the system maintains zero transfer time to protect critical loads.

This approach allows runtime to be engineered per site rather than constrained by fixed internal battery capacity.

Where P91 Fits in Rack Power Architecture

P91 operates as the standard online UPS platform within a distributed power architecture, providing conditioned power and scalable runtime at the rack or edge level.

It is typically deployed:

• in network closets and IDF/MDF environments
• across multi-site infrastructure requiring consistent UPS platforms
• alongside downstream PDUs for power distribution

For system design context:
https://xpcc.com/rack-power-architecture/

P91 vs Conventional Rack UPS Platforms

Compared to line-interactive and entry-level UPS systems, P91 provides continuous power conditioning and zero transfer time, making it suitable for sensitive IT and AV loads.

Its primary advantage over compact UPS platforms is runtime flexibility. External battery expansion allows the system to support a wide range of outage scenarios, from short ride-through to extended runtime, without changing the UPS platform.

Replace APC / Eaton 120V Online UPS

P91 is commonly deployed as a replacement for legacy rackmount UPS platforms including:

• APC Smart-UPS SMT and SRT series
• Eaton 5PX and 9PX systems
• Vertiv Liebert GXT models

It provides a more flexible runtime architecture while maintaining full-time power conditioning and standardized deployment across distributed environments.

Detailed comparisons:
https://xpcc.com/p91-ups-competitive-comparisons/

Runtime Architecture and Deployment Flexibility

The combination of internal batteries and external expansion enables P91 to support multiple deployment strategies.

It can be configured for short-duration ride-through, controlled shutdown of IT systems, or extended runtime for critical infrastructure. This flexibility is particularly valuable in multi-site deployments where runtime requirements vary.

UPS sizing tool:
https://xpcc.com/selector

P91 vs Lithium UPS Platforms

P91 represents a VRLA-based approach optimized for runtime scalability and lower upfront cost.

Within the Xtreme Power portfolio:

• P91 → scalable runtime using external batteries
• P91 Li → lithium UPS with reduced maintenance and longer lifecycle
• J90 → high-density lithium UPS with outlet-level control

P91 is typically selected when extended runtime and cost structure are prioritized over lifecycle optimization and battery longevity.

For lithium comparison:
https://xpcc.com/lithium-ups-guide/

Typical Applications

P91 is deployed across distributed infrastructure environments including AV systems, network infrastructure, retail environments, education facilities, and commercial installations.

It is particularly well suited for applications requiring consistent UPS platforms with varying runtime requirements across locations.

Capacity Guidance

Capacity selection is based on load and runtime objectives:

• 1000 VA → small network and AV systems
• 1500 VA → distributed IT equipment
• 2000 VA → network racks and AV infrastructure
• 3000 VA → higher-density distributed systems

Runtime is defined by battery configuration and load profile.

Xtreme Power UPS Platform Context

P91 serves as the runtime-flexible online UPS tier within the broader architecture:

• A60 → standby UPS (device-level)
• S71 → line-interactive UPS
• P80 → line-interactive rack UPS
• P91 → online UPS with scalable runtime
• P91 Li → lithium runtime platform
• J90 → high-density lithium UPS

Technical Summary

Topology: Online double conversion
Capacity: 1000–3000 VA
Voltage: 120V
Battery: VRLA (internal + external expansion)
Form Factor: 2U rack / tower
Runtime: Scalable
Monitoring: Optional SNMP / web
Compliance: TAA

Plan With Confidence

Xtreme Power Conversion supports engineers and infrastructure planners in designing UPS systems with scalable runtime, power protection, and distributed deployment strategies.

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