M90U 20 kVA vs Mitsubishi DiamondPlus 1100A
The Xtreme Power M90U 20 kVA and the Mitsubishi DiamondPlus 1100A are modular online double-conversion UPS systems for 208V three-phase applications. The M90U delivers full 20 kW usable output at unity power factor, significantly longer internal runtime, modular battery architecture, and internal maintenance bypass as standard. The DiamondPlus 1100A provides modular power architecture but reduced usable output at 18 kW and shorter internal runtime.
Where the M90U 20 kVA leads
- Full 20 kVA / 20 kW usable output at unity power factor — vs the 1100A’s 18 kW.
- Internal scalability up to 60 kVA / 60 kW.
- Significantly longer internal runtime (up to 26 vs 5 min at full load).
- Modular internal battery architecture for flexible runtime scaling.
- Internal maintenance bypass standard, plus a longer standard warranty.
M90U 20 kVA and the DiamondPlus 1100A, side by side
| Specification | Xtreme Power M90U 20 kVA | Mitsubishi DiamondPlus 1100A | Advantage |
|---|---|---|---|
| Rated capacity | 20 kVA / 20 kW | 20 kVA / 18 kW | Higher usable power, unity PF |
| Topology | Online double-conversion | Online double-conversion | Equivalent premium protection |
| Internal scalability | Up to 60 kVA / 60 kW | Limited to 20 kVA / 18 kW (internal) | Greater long-term growth |
| Modular architecture | Power + battery modules | Power modules only | Modular batteries scale runtime |
| Efficiency (online / ECO) | 94.1% / up to 98% ECO | Up to 93% / no ECO | Higher efficiency, plus ECO mode |
| Internal runtime (full load) | Up to 26 min @ 20 kW | Up to 5 min @ 18 kW | Significantly longer runtime |
| Maintenance bypass | Internal, standard | External, optional | No additional hardware |
| User interface | LCD display | LCD touchscreen | Both LCD; Mitsubishi touchscreen |
| Warranty | 2-year standard | 1-year standard | Longer standard coverage |
Both are true online double-conversion modular UPS. The M90U leads on usable unity-PF output, internal scalability to 60 kVA, internal runtime, modular batteries, ECO efficiency, internal bypass, and warranty. The DiamondPlus offers an LCD touchscreen interface. Confirm 1100A specifications against current Mitsubishi documentation.
Choosing between them
Choose the M90U for full 20 kW usable output, scalability to 60 kVA, much longer internal runtime, modular batteries, internal bypass, and a longer warranty. The DiamondPlus 1100A fits where an existing Mitsubishi standard governs, 18 kW usable output suffices, and extended internal runtime is not required.
Choose the M90U 20 kVA if you need
- Full 20 kW usable capacity at unity PF
- Internal scalability up to 60 kVA
- Significantly longer internal runtime
- Modular battery architecture
- Internal maintenance bypass included
- Higher efficiency with ECO mode
- Longer standard warranty
The DiamondPlus 1100A may fit if you need
- A Mitsubishi standard governs the facility
- 18 kW usable output is sufficient
- Extended internal runtime is not required
- Mitsubishi service program alignment
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.