The Xtreme Power Conversion M90S-6S (18 kW) and the Eaton 9PXM12S20K are modular, true online, double-conversion UPS systems designed to protect mission-critical IT, network, and edge-infrastructure loads.
While both platforms deliver enterprise-grade power protection and scalable modular architectures, the M90S-6S provides full 18 kW usable output at a lower kVA rating, longer internal runtime, and integrated service features, helping reduce accessories, simplify deployment, and lower total lifecycle cost.
18 kVA Modular Online UPS Comparison
| Feature | XTREME POWER M90S-6S (18 kW) | Eaton 9PXM12S20K | M90S Advantage |
| UPS Capacity (Usable Power) | 18 kVA / 18 kW (unity PF) | 20 kVA / 18 kW (0.9 PF) | Delivers full 18 kW without upsizing to 20 kVA, simplifying right-sizing |
| Topology | Online Double Conversion | Online Double Conversion | Equivalent double-conversion protection |
| Internal Runtime (Full Load) | ~9 min @ 18 kW | ~6 min @ 18 kW | Longer baseline runtime reduces need for EBMs |
| Maintenance Bypass | Standard, integrated | Optional / external | Built-in bypass saves cost and installation space |
| Rack / Tower Mounting | Tower or rack (M90S-RMK) | Rack / tower (≈21U) | M90S supports rack deployment with RMK |
| Display & Diagnostics | Chassis LCD + module-level displays | Chassis-level LCD (graphical) | Module-level visibility simplifies troubleshooting |
| Certifications & Compliance | UL, cUL, TAA Compliant | UL, cUL, TAA Compliant | Equivalent compliance for regulated markets |
| Warranty Coverage | 3 years (electronics & batteries) | 2-year limited warranty | Longer standard coverage lowers lifecycle risk |
Printable Comparison PDF
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Where the M90S-6S Excels
- Deployments requiring full 18 kW usable output without oversizing kVA
- High-density racks where runtime and serviceability matter
- Installations that benefit from integrated maintenance bypass
- Projects aiming to minimize accessories and installation complexity
- Organizations prioritizing longer standard warranty coverage
When Eaton 9PXM12S20K May Be a Fit
- Eaton-standardized environments
- Designs already sized around 20 kVA chassis capacity
- Deployments where external or optional bypass hardware is acceptable
Who Should Choose Which
Choose Xtreme Power Conversion M90S-6S (18 kW) if you need:
- Full 18 kW output at unity power factor
- Longer internal runtime without external batteries
- Built-in maintenance bypass as standard
- Module-level diagnostics for faster service and commissioning
- Longer standard warranty on electronics and batteries
Choose Eaton 9PXM12S20K if you need:
- Alignment with an existing Eaton 9PXM platform
- A system architected around 20 kVA frame sizing
- Optional or external service 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 or Configuration Review
Xtreme Power Conversion
Phone: (800) 582-4524
Email: sales@xpcc.com