M90S-4S Modular UPS – 6–12kW Scalable Single-Phase UPS with N+1 Redundancy

The M90S-4S is a modular online double-conversion UPS designed for facilities where power requirements are growing beyond rack UPS capability but remain within single-phase electrical infrastructure.

Built on a 4-slot architecture using 6 kW power modules, the system scales from 6 kW to 12 kW and supports N+1 redundancy, runtime expansion, and phased deployment within a single platform.

Key Specifications

• 6–12 kW capacity
• 208/120V or 240/120V single phase
• Online double-conversion topology
• 6 kW modular power blocks
• 4 universal slots (power or battery)
• N+1 redundancy capable
• Modular battery expansion
• Configurable output distribution
• Input connection: L14-30P (6 kW configuration)
• 3-year warranty (USA & Canada)
• TAA compliant

Datasheet:
https://xpcc.com/wp-content/uploads/M90S-4S-flyer.pdf

Scalable Modular Power Architecture

M90S-4S introduces true modular scalability within single-phase infrastructure.

Capacity can be increased incrementally by adding power modules, while redundancy can be implemented using N+1 configuration within the same system.

This enables infrastructure planners to align UPS capacity with actual load requirements while maintaining flexibility for future expansion.

Where M90S-4S Fits in Power Architecture

M90S-4S operates as a scalable centralized UPS platform within single-phase infrastructure.

It is typically deployed:

• in electrical rooms supporting distributed infrastructure
• where multiple UPS systems would otherwise be required
• in facilities transitioning toward centralized UPS design

Within the Xtreme Power architecture:

• P91 → rack-level UPS
• T91 → long-runtime UPS
• M90S-2S → entry centralized UPS
• M90S-4S → scalable modular UPS (this platform)
• M90S-6S / 12S → higher-capacity modular systems
• Li90 → three-phase facility UPS

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

Modular UPS vs Traditional UPS

UPS systems are typically deployed using either fixed-capacity (traditional) architecture or modular architecture.

Traditional UPS systems must be oversized or replaced as infrastructure grows. The M90S-4S enables capacity, redundancy, and runtime to be scaled incrementally within a single system.

Key Differences

Flexible Electrical Integration

M90S-4S supports simplified deployment using a factory-installed L14-30P input connection for 6 kW configurations.

Configurable output options include:

• IEC C19
• NEMA 5-15R / 5-20R
• NEMA L6-20R / L6-30R
• NEMA L14-30R

This enables deployment without immediate electrical infrastructure modification.

Rack Deployment and Installation

M90S modular UPS systems support rack-based deployment with integrated mounting hardware and serviceable module access, enabling installation within standard equipment racks while maintaining accessibility for power and battery modules.

Watch rack mounting demonstration (YouTube):
https://www.youtube.com/shorts/lsok0-_uHAg

When to Use a Modular Single-Phase UPS

M90S-4S is typically selected when:

• infrastructure is expected to grow over time
• redundancy is required within a single system
• multiple UPS systems are becoming difficult to manage
• runtime requirements exceed rack UPS capability
• three-phase upgrades are not practical

M90S-4S vs Traditional UPS Systems

Traditional UPS systems are fixed-capacity and require full replacement when capacity limits are reached.

M90S-4S enables phased expansion and integrated redundancy within a single system, improving lifecycle flexibility and simplifying infrastructure planning.

Replace APC / Eaton UPS Systems

M90S-4S is commonly deployed as a replacement for:

• distributed UPS deployments
• fixed-capacity single-phase UPS systems
• entry-level modular UPS platforms

Explore comparisons:
https://xpcc.com/m90s-modular-ups-competitive-comparisons/

Typical Applications

M90S-4S is deployed in:

• telecommunications infrastructure
• network distribution rooms
• industrial automation systems
• broadcast environments
• commercial infrastructure

Capacity Guidance

Capacity is defined by module configuration:

• 6 kW → base system
• 12 kW → full system
• N+1 → redundancy configuration

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

M90S Modular Platform Options

• M90S-2S → 6 kW
• M90S-4S → 6–12 kW (this platform)
• M90S-6S → 6–24 kW
• M90S-12S → up to 48 kW

Technical Summary

Topology: Online double conversion
Capacity: 6–12 kW
Voltage: 208/120V or 240/120V
Architecture: Modular
Slots: 4
Redundancy: N+1 capable
Battery: Modular expansion

Plan With Confidence

Xtreme Power Conversion supports engineers and infrastructure planners in designing modular UPS systems for scalable capacity, redundancy, and long-term infrastructure growth.

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