The Xtreme Power Conversion M90S-4S and the Eaton 9PXM8S8K are modular, true online, double-conversion UPS systems designed to protect mission-critical IT, network, and edge-infrastructure loads.
While both platforms support modular architectures and scalable configurations, the M90S-4S delivers substantially higher usable power, longer internal runtime, and integrated service features, making it better suited for higher-density applications where power headroom and serviceability matter.
8 kVA to 12 kVA Modular Online UPS Comparison
| Feature | XTREME POWER M90S-4S | Eaton 9PXM8S8K | M90S Advantage |
| UPS Capacity (Usable Power) | 12 kVA / 12 kW (unity PF) | 8 kVA / 7.2 kW (0.9 PF) | 67% more usable kW, supports higher load density without oversizing |
| Topology | Online Double Conversion | Online Double Conversion | Equivalent double-conversion protection |
| Internal Runtime (Full Load) | ~9 min @ 12 kW | ~6 min @ 7.2 kW (base battery) | Longer baseline runtime reduces reliance on EBMs |
| Maintenance Bypass | Standard, integrated | Optional / external | Built-in bypass lowers installation cost and saves space |
| Rack / Tower Mounting | Rack mount kit available (M90S-RMK) | Rack / tower convertible | Flexible deployment options |
| Display & Diagnostics | Chassis LCD + module-level displays | Single chassis-level LCD | More detailed local visibility for commissioning |
| Certifications & Compliance | UL, cUL, TAA Compliant | UL, cUL, TAA Compliant | Meets federal and regulated-market requirements |
| Warranty Coverage | 3 years (electronics & batteries) | 2-year limited warranty | Longer standard coverage reduces lifecycle risk |
Printable Comparison PDF
Download the Full Comparison PDF
https://xpcc.com/wp-content/uploads/Xtreme-M90S-4S-Eaton-9PXM8S8K-Comparison.pdf
Where the M90S-4S Excels
- Applications requiring significantly higher usable kW in a compact modular platform
- Higher-density IT and edge deployments where future growth is expected
- Sites that benefit from integrated maintenance bypass as standard
- Environments prioritizing simpler service, fewer accessories, and lower lifecycle cost
- Federal, education, and regulated markets requiring TAA compliance
When Eaton 9PXM8S8K May Be a Fit
- Eaton-standardized environments
- Lower-density deployments sized around ~7 kW usable output
- Designs where external or optional bypass hardware is acceptable
Who Should Choose Which
Choose Xtreme Power Conversion M90S-4S if you need:
- Up to 12 kW usable output from a modular single-phase UPS
- Substantially higher power headroom without oversizing kVA
- Longer internal runtime at rated load
- Built-in maintenance bypass as standard
- Module-level diagnostics for faster service and troubleshooting
- Longer standard warranty on electronics and batteries
Choose Eaton 9PXM8S8K if you need:
- Alignment with an existing Eaton 9PXM platform
- Modular expansion within Eaton’s ecosystem
- A lower-power starting configuration with optional accessories
Typical Applications
- Edge and enterprise data centers
- IDF / MDF closets
- Healthcare and laboratory environments
- Education and government infrastructure
- Modular UPS deployments requiring growth flexibility
Plan with Confidence
Request a Quote or Configuration Review
Xtreme Power Conversion
Phone: (800) 582-4524
Email: sales@xpcc.com