M90S-6S (12 kW) vs Vertiv Liebert APS AS5B0NCVGNNXLKB
The Xtreme Power M90S-6S, configured for 12 kW usable output, and the Vertiv Liebert APS AS5B0NCVGNNXLKB are modular online double-conversion UPS for mission-critical IT, network, and edge-infrastructure loads. Both support modular growth and redundancy; the M90S-6S delivers higher usable power at unity power factor, longer baseline runtime, and greater scalability headroom — better suited to higher-density 12 kW deployments.
Where the M90S-6S leads at 12 kW
- About 33% more usable kW at base rating — 12 kW (unity PF) vs 9 kW.
- Longer baseline internal runtime (about 9 min vs 5 min), reducing reliance on external battery modules.
- Greater growth and redundancy headroom — scales to 24 kVA (18 kVA N+1) vs 15 kVA.
- Integrated maintenance bypass, module-level diagnostics, TAA compliance, and a 3-year warranty.
12 kW modular UPS, side by side
| Specification | Xtreme Power M90S-6S | Vertiv Liebert APS AS5B0NCVGNNXLKB | Advantage |
|---|---|---|---|
| Usable output capacity | 12 kVA / 12 kW (unity PF) | 10 kVA / 9 kW | About 33% more usable kW at base rating |
| Topology | Online double-conversion | Online double-conversion | Equivalent protection |
| Internal runtime (full load, base) | About 9 min @ 12 kW | About 5 min @ 9 kW | Longer baseline runtime without EBMs |
| Scalability / redundancy | Scales to 24 kVA, or 18 kVA N+1 | Scales to 15 kVA (N+1) | Greater growth and redundancy headroom |
| Maintenance bypass | Standard, integrated | Optional external | Reduced accessories and installation cost |
| Display & diagnostics | Chassis LCD + module-level displays | Chassis-level LCD | More granular local visibility |
| Certifications | UL, cUL, TAA compliant | UL, cUL | TAA compliance for regulated markets |
| Warranty | 3 years (electronics & batteries) | 2-year limited | Longer standard coverage |
Capacity figures show usable watts: the M90S delivers unity power factor (kVA = kW), while the Vertiv APS is rated at a lower power factor. The M90S is UL / cUL listed and TAA compliant; the Vertiv APS is UL / cUL. Runtime figures are base-battery, full-load estimates from manufacturer documentation.
Choosing between them
Both are modular online double-conversion UPS. The M90S leads on unity-PF usable kW, longer baseline runtime, scalability headroom, integrated bypass, module-level diagnostics, TAA compliance, and warranty; the Vertiv APS fits where it is already the standard or where the load sits at or below its usable rating.
Choose the M90S-6S if you need
- Full 12 kW usable output without oversizing
- Longer runtime with base batteries
- Growth headroom beyond 15 kVA within one platform
- Integrated maintenance bypass to simplify installation
- TAA-compliant solutions for regulated environments
The Liebert APS AS5B0NCVGNNXLKB may fit if you need
- Alignment with an existing Vertiv APS ecosystem
- A solution sized for 9 kW or less usable output
- External bypass and EBMs as part of a predefined architecture
Related comparisons
Replacing a Symmetra LX or planning modular UPS?
Xtreme Power supports modular UPS sizing, N+1 redundancy planning, and smooth migration from legacy Symmetra LX systems across enterprise, healthcare, industrial, and public-sector infrastructure.