The Xtreme Power Conversion M90S-6S and the Eaton 9PXM12S16K are modular, true online, double-conversion UPS systems designed to protect mission-critical IT, network, and edge-infrastructure loads.
While both platforms support modular growth and redundant architectures, the M90S-6S delivers higher usable power at unity power factor, longer internal runtime, and integrated service features, making it better suited for higher-density applications and future load growth.
16 kVA to 18 kVA Modular Online UPS Comparison
| Feature | XTREME POWER M90S-6S | Eaton 9PXM12S16K | M90S Advantage |
| UPS Capacity (Usable Power) | 18 kVA / 18 kW (unity PF) | 16 kVA / 14.4 kW (0.9 PF) | 25% more usable kW, supporting higher load density without upsizing kVA |
| Topology | Online Double Conversion | Online Double Conversion | Equivalent double-conversion protection |
| Internal Runtime (High Load) | ~9 min @ 18 kW | ~6 min @ 14.4 kW (base battery) | Longer baseline runtime reduces reliance on EBMs |
| Maintenance Bypass | Standard, integrated | Optional / external (varies by configuration) | Built-in bypass lowers installation cost and saves space |
| Rack / Tower Mounting | Rack kit (M90S-RMK) or tower | Rack / tower convertible | Flexible deployment options |
| Display & Diagnostics | Chassis LCD + module-level displays | Single chassis-level LCD | More detailed local visibility simplifies commissioning and troubleshooting |
| Certifications & Compliance | UL, cUL, TAA Compliant | UL, cUL, TAA Compliant | Both meet federal and regulated-market requirements |
| Warranty Coverage | 3 years (electronics & batteries) | 2-year limited warranty | Longer standard coverage reduces lifecycle risk |
Printable Comparison PDF
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Download the Full Comparison PDF
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Where the M90S-6S Excels
- Applications requiring full usable kW at unity power factor
- Higher-density racks where oversizing kVA is undesirable
- Deployments needing longer internal runtime without external batteries
- Installations where integrated maintenance bypass simplifies service
- Projects prioritizing longer standard warranty coverage
When Eaton 9PXM May Be a Fit
- Eaton-standardized environments
- Deployments already designed around external or optional bypass hardware
- Sites where lower base kW capacity aligns with load requirements
Who Should Choose Which
Choose Xtreme Power Conversion M90S-6S if you need:
- 18 kW usable output without PF derating
- Longer baseline runtime from internal batteries
- Integrated maintenance bypass as standard
- Greater diagnostic visibility at the module level
- Longer standard warranty on electronics and batteries
Choose Eaton 9PXM12S16K if you need:
- Alignment with an existing Eaton 9PXM ecosystem
- A modular platform sized specifically around ~14 kW usable loads
- External or optional bypass as part of a predefined design
Typical Applications
- Enterprise and edge data centers
- IDF / MDF closets with rising power density
- Healthcare and laboratory environments
- Education and government infrastructure
- Modular UPS standardization programs
Plan with Confidence
Request a Quote
Work with Xtreme Power Conversion to configure the optimal M90S-6S modular architecture for your capacity, runtime, and compliance requirements.
Xtreme Power Conversion
Phone: (800) 582-4524
Email: sales@xpcc.com