M90U 40 kVA vs Mitsubishi DiamondPlus 1100A
The Xtreme Power M90U 40 kVA and the Mitsubishi DiamondPlus 1100A are modular online double-conversion UPS systems for 208V three-phase applications. The M90U delivers full 40 kW usable output at unity power factor, supports expansion to 60 kVA within the same platform, and integrates batteries and maintenance bypass in a single cabinet. The DiamondPlus 1100A provides reduced usable output at 36 kW and requires external battery and maintenance-bypass configurations for comparable deployment.
Where the M90U 40 kVA leads
- Full 40 kVA / 40 kW usable output at unity power factor — vs the 1100A’s 36 kW.
- Internal scalability up to 60 kVA / 60 kW.
- Integrated internal batteries and maintenance bypass in a single cabinet.
- Modular internal battery architecture with module-level service.
- Higher ECO-mode efficiency and a more compact total footprint, plus a longer warranty.
M90U 40 kVA and the DiamondPlus 1100A, side by side
| Specification | Xtreme Power M90U 40 kVA | Mitsubishi DiamondPlus 1100A | Advantage |
|---|---|---|---|
| Rated capacity | 40 kVA / 40 kW | 40 kVA / 36 kW | Higher usable power, unity PF |
| Topology | Online double-conversion | Online double-conversion | Equivalent premium protection |
| Power module size | 20 kVA / 20 kW modules | 10 kVA / 9 kW modules | Fewer, unity-PF modules at full load |
| Internal scalability | Up to 60 kVA / 60 kW | Limited to 50 kVA / 45 kW | Greater growth headroom |
| System integration | Internal batteries + internal bypass | External battery + external bypass | Reduced footprint & install complexity |
| Battery service | Modular internal VRLA, module-level | Traditional battery strings | Faster, simpler service |
| Efficiency (online / ECO) | 94.1% / up to 98% ECO | Up to ~93% / no ECO | Higher efficiency, plus ECO mode |
| Physical footprint | Single cabinet (batteries + bypass) | Multiple cabinets required | More compact total layout |
| User interface | 5.7-in LCD | 3.4-in touchscreen LCD | M90U larger display; Mitsubishi touchscreen |
| Warranty | 2-year standard | 1-year standard | Longer standard coverage |
Both are modular online double-conversion UPS. The M90U leads on usable unity-PF output, scalability, integrated internal batteries and bypass, module-level battery service, ECO efficiency, footprint, and warranty. The DiamondPlus uses a touchscreen and an external-battery/bypass approach. Confirm 1100A specifications against current Mitsubishi documentation.
Choosing between them
Choose the M90U for full 40 kW usable output, scalability to 60 kVA, integrated batteries and bypass in one compact cabinet, simpler battery service, ECO efficiency, and a longer warranty. The DiamondPlus 1100A fits where a Mitsubishi standard governs, 36 kW suffices, and external battery cabinets are preferred.
Choose the M90U 40 kVA if you need
- Full 40 kW usable capacity
- Internal scalability up to 60 kVA
- Integrated batteries and maintenance bypass
- Modular battery service
- Higher efficiency with ECO mode
- Compact single-cabinet deployment
- Longer standard warranty
The DiamondPlus 1100A may fit if you need
- A Mitsubishi standard governs the facility
- 36 kW usable output is sufficient
- External battery and bypass configurations are preferred
- Reduced per-module capacity scaling
Related comparisons
Plan your M90U deployment
Talk to an Xtreme Power specialist about modular UPS sizing, phased capacity expansion to 60 kVA, N+1 redundancy, runtime architecture with internal battery modules, and Mitsubishi / APC / Eaton replacement for centralized facility power.