E91 Three-Phase UPS – Compact Facility UPS (10–20kVA, 208/120V)

The Xtreme Power E91 Series is designed for healthcare, industrial automation, telecommunications, and distributed infrastructure environments where a compact, integrated UPS platform supports facility-level continuity without the complexity of large-scale or modular systems.

Key Specifications

• 10 / 15 / 20 kVA
• 208/120V three-phase
• Online double-conversion topology
• Internal VRLA battery architecture
• Optional external battery cabinets for runtime expansion
• Compact integrated UPS cabinet
• Electrical-room deployment optimized
• Predictable lifecycle maintenance model

Datasheet:
https://xpcc.com/wp-content/uploads/E91-10-20kW-Flyer.pdf

Compact Centralized UPS Architecture

E91 defines the category of compact centralized three-phase UPS systems for localized facility infrastructure.

The platform integrates UPS electronics and VRLA batteries within a single cabinet, simplifying deployment and reducing installation complexity in space-constrained electrical rooms. Optional external battery cabinets allow runtime expansion without transitioning to modular UPS architecture.

This approach provides a balance between footprint efficiency, deployment simplicity, and established lifecycle service models.

Where E91 Fits

E91 operates as the compact facility-level UPS platform within distributed infrastructure environments.

Within the Xtreme Power architecture:

• P91 / J90 → rack-level UPS systems
• E91 → compact centralized facility UPS (this platform)
• Li90 → integrated lithium modernization platform
• M90U → modular scalable UPS platform

E91 is typically deployed in electrical rooms supporting localized infrastructure where centralized UPS protection is required without full data center-scale systems.

Key Advantages of E91

E91 is engineered for facilities where compact footprint, service simplicity, and predictable maintenance are primary considerations.

• Integrated UPS and battery cabinet with compact footprint simplifies installation
• Optional external battery cabinets provide runtime flexibility
• Established VRLA lifecycle with predictable maintenance intervals
• Simplified retrofit deployment in existing electrical rooms
• Accessible service design for routine maintenance

E91 vs Modular UPS Platforms

Modular UPS systems provide scalability and redundancy but introduce additional system complexity, cost, and footprint. E91 delivers a simpler centralized architecture for applications where capacity requirements are fixed and modular expansion is not required, making it well suited for facilities prioritizing deployment simplicity and predictable service planning.

E91 vs Lithium Three-Phase UPS (Li90)

E91 represents a traditional VRLA-based approach aligned with established maintenance practices and lower upfront cost. Lithium platforms such as Li90 prioritize reduced maintenance, longer battery life, and higher energy density. E91 is typically selected when infrastructure is aligned with periodic battery replacement cycles and when lifecycle familiarity and cost structure are key considerations.

Learn more:
https://xpcc.com/lithium-ups-vs-lead-acid-ups/

Replace Legacy Three-Phase UPS Systems

E91 is commonly deployed to replace aging compact three-phase UPS systems in localized infrastructure environments, particularly in electrical rooms where space is limited and straightforward replacement is required.

Typical scenarios include small facility UPS systems approaching battery replacement, legacy centralized UPS platforms in industrial or telecom environments, and commercial infrastructure requiring compact and serviceable power protection.

Explore comparisons:
https://xpcc.com/e91-ups-comparisons/

Typical Applications

E91 is deployed across facilities requiring compact centralized UPS protection, including healthcare imaging and clinical environments, industrial automation systems, commercial electrical infrastructure, telecommunications power rooms, and distributed IT or edge computing environments.

Capacity Guidance

Capacity selection typically aligns with facility scope and load requirements. A 10 kVA system is commonly used for small electrical rooms, 15 kVA supports imaging and automation infrastructure, and 20 kVA is deployed in broader commercial facility environments. Runtime can be extended through external battery cabinets based on continuity requirements.

UPS sizing tool:
https://xpcc.com/ups-sizing-tool/

Expanded Capacity Options

For deployments requiring higher centralized capacity within the same architecture:

E91 30–40 kVA platform:
https://xpcc.com/products/e91_30-40k/

Infrastructure Planning Context

E91 is typically selected in environments where centralized UPS protection must balance electrical room constraints, maintenance strategy, runtime flexibility, and overall system simplicity. This makes it well suited for facilities seeking a predictable and serviceable UPS platform without the complexity of modular or lithium-based architectures.

Technical Summary

• Topology: Online double conversion
• Capacity: 10–20 kVA
• Voltage: 208/120V three-phase
• Battery: Internal VRLA with external expansion options
• Architecture: Centralized compact UPS
• Application: Facility-level infrastructure

Plan With Confidence

Xtreme Power Conversion supports facility engineers, contractors, and infrastructure planners in deploying UPS systems with predictable lifecycle performance, efficient electrical room integration, and reliable power protection.

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