40 kVA Modular Online UPS Comparison for 208V Three-Phase Applications
Medium-frame three-phase UPS systems are commonly deployed in healthcare facilities, education campuses, data rooms, and distributed infrastructure requiring scalable architecture, defined internal runtime, and efficient operation. The Xtreme Power M90U 40 kVA and the Mitsubishi DiamondPlus 1100A are modular, online double-conversion UPS systems designed for 208V three-phase applications.
Both platforms utilize modular power architectures and premium online topology to provide continuous, conditioned power to critical loads. However, differences emerge in usable output capacity, internal scalability, system integration approach, battery serviceability, efficiency modes, and standard warranty coverage.
The M90U 40 kVA delivers full 40 kW usable output at unity power factor, supports expansion up to 60 kVA within the same platform, and integrates batteries and maintenance bypass within a single cabinet. The Mitsubishi DiamondPlus 1100A provides modular power architecture but reduced usable output at 36 kW and requires external battery and maintenance bypass configurations for comparable deployment.
For facilities prioritizing higher usable power, compact system integration, and simplified battery service, the M90U 40 kVA provides a scalable and space-efficient solution.
Learn more about the Xtreme Power M90U Series
https://xpcc.com/products/m90u/
Key Differentiators at a Glance
- Full 40 kVA / 40 kW usable output (unity power factor)
• Internal scalability up to 60 kVA / 60 kW
• Integrated internal batteries and maintenance bypass
• Modular internal battery architecture with module-level service
• Higher operating efficiency with ECO mode
• More compact total system footprint
• Longer standard warranty coverage
40 kVA Modular UPS Feature Comparison
208V, Three-Phase Applications
| Feature | Xtreme Power M90U 40 kVA | Mitsubishi DiamondPlus 1100A | Notes / Considerations |
| Rated Capacity | 40 kVA / 40 kW | 40 kVA / 36 kW | Higher usable power (unity power factor) |
| Topology | Online double conversion | Online double conversion | Equivalent premium protection |
| Power Module Size | 20 kVA / 20 kW modules | 10 kVA / 9 kW modules | Fewer modules required at full load |
| Scalability (Internal) | Scales up to 60 kVA / 60 kW | Limited to 50 kVA / 45 kW | Greater growth headroom |
| System Integration | Internal batteries and internal maintenance bypass | External battery and external maintenance bypass | Reduced footprint and installation complexity |
| Battery Architecture & Service | Modular internal VRLA batteries; module-level replacement | Traditional battery strings | Faster, simpler battery service |
| Efficiency (Online / ECO) | 94.1% online; up to 98% ECO mode | Up to ~93% online; no ECO mode | Higher efficiency operating options |
| Physical Footprint | Single cabinet with batteries and bypass | Multiple cabinets required | More compact total system layout |
| User Interface | 5.7 in LCD display | 3.4 in touchscreen LCD | Larger system display |
| Warranty | 2-year standard | 1-year standard | Longer standard coverage |
Download the Printable Comparison
Download the Xtreme Power M90U 40 kVA vs Mitsubishi DiamondPlus 1100A comparison PDF
Ideal for engineering submittals, bid reviews, and procurement evaluations.
https://xpcc.com/wp-content/uploads/Xtreme-M90U-Mitsubishi-1100A-40kVA-Comparison.pdf
Where the M90U 40 kVA Excels
- Facilities requiring full 40 kW usable output
• Deployments planning future expansion to 60 kVA
• Installations seeking integrated battery and maintenance bypass
• Projects prioritizing compact system footprint
• Environments requiring simplified battery serviceability
• Applications seeking higher ECO-mode efficiency
• Specifications requiring longer standard warranty coverage
When the Mitsubishi DiamondPlus 1100A May Be a Fit
- Facilities standardized on Mitsubishi infrastructure
• Deployments requiring 36 kW usable output
• Installations utilizing external battery cabinets
• Projects aligned with Mitsubishi modular power architecture
Who Should Choose Which?
Choose the Xtreme Power M90U 40 kVA if you need:
- Full 40 kW usable capacity
• Internal scalability up to 60 kVA
• Integrated batteries and maintenance bypass
• Modular battery architecture with simplified service
• Higher operating efficiency with ECO mode
• Compact, single-cabinet deployment
• Longer standard warranty coverage
Choose the Mitsubishi DiamondPlus 1100A if you need:
- Alignment with existing Mitsubishi UPS deployments
• External battery and bypass configurations
• Reduced per-module capacity scaling approach
Compare M90U 40 kVA to Other Modular UPS Alternatives
Evaluating medium-frame three-phase UPS platforms or planning multi-site standardization?
View all M90U Series comparisons: https://xpcc.com/m90u-ups-comparisons/
Plan With Confidence
Xtreme Power Conversion supports specification development, runtime planning, and modular UPS deployment for healthcare, education, retail, industrial, and distributed IT environments.
(800) 582-4524
sales@xpcc.com