M90S-12S Modular UPS | 6-48 kW High-Capacity Single-Phase
6–48 kW | 208/120V or 240/120V | Modular Online UPS
High-capacity single-phase UPS engineered for centralized power protection where three-phase utility is unavailable or impractical. Supports scalable capacity, N+1 redundancy, and infrastructure-level continuity in commercial, telecommunications, industrial, and large residential environments.
6–48 kW · 208/120V or 240/120V · Modular Online Double-Conversion UPS · N+1
M90S-12S high-capacity modular single-phase UPS
The M90S-12S is the highest-capacity platform in the M90S modular family — a 12-slot online double-conversion UPS that scales from 6 kW to 48 kW on single-phase power (48 kW at 240/120 V; up to 42 kW at 208/120 V). It delivers 30 kVA+ centralized protection where three-phase utility is unavailable, impractical, or not cost-effective, using hot-swappable 6 kW power modules and modular batteries for N+1 redundancy and phased growth in one hardwired system. Unity output power factor (kVA = kW), integral maintenance bypass, a 10″ system touch display, and up to 98% ECO-mode efficiency. A $50,000 load protection policy (USA and Canada) covers the connected equipment. TAA compliant; UL-1778 (TUV) / cUL listed.
High-capacity power without three-phase
The M90S-12S addresses a real gap in power infrastructure: delivering 30 kVA+ UPS protection in single-phase environments. In many facilities — large residential and whole-home systems, telecom and cell-tower sites, remote or distributed locations, and light industrial and commercial buildings — three-phase utility is not available or cannot be economically deployed. Built on a 12-slot architecture using 6 kW power modules, the M90S-12S scales from 6 kW to 48 kW while supporting redundancy, runtime expansion, and phased deployment within a single platform — eliminating the cost of electrical upgrades or infrastructure redesign.
What the M90S-12S delivers
Add hot-swappable 6 kW power modules as infrastructure grows — eight capacity steps from 6 to 48 kW within one frame, so UPS capacity aligns to actual load instead of oversizing or replacing systems.
Configure redundant power and battery modules for N+1 within a single system, up to 42 kW (seven load modules plus one redundant) — the availability of multiple UPS without the footprint, wiring, or management overhead. The 48 kW build uses all eight power slots for capacity and is non-redundant.
Unity PF (kVA = kW) delivers full usable watts — up to 48 kW — so you never oversize to cover a derated power factor, with best-in-class efficiency that lowers energy cost and heat output.
A 10-inch system touch display provides graphic system status and alarms, while each power module carries its own LCD for module-level detail and redundancy state — faster diagnostics across a high-capacity system.
Twelve slots accept power or battery modules, so capacity and runtime can be balanced to the deployment — and rebalanced later — without changing the enclosure.
A manual maintenance bypass transfers the critical load from UPS to utility power for service without dropping the load, and hot-swappable modules keep capacity changes and repairs online.
The high-capacity modular tier
The M90S-12S is the top of the M90S single-phase modular family — the highest-capacity centralized UPS within single-phase infrastructure, above the core M90S-6S and below three-phase facility systems. It is typically deployed in electrical rooms supporting distributed infrastructure, in facilities approaching single-phase capacity limits, or where centralizing several separate UPS simplifies a deployment.
Choose the M90S-12S when single-phase load runs 24–48 kW, or when 6–24 kW deployments need maximum runtime and redundancy headroom in one frame; step down to the M90S-6S for 6–24 kW, the M90S-2S / 4S for smaller loads, or across to the three-phase Li90 for facility-level lithium.
Modular vs traditional UPS
Traditional fixed-capacity UPS must be oversized up front or replaced as infrastructure grows. A modular platform lets capacity, redundancy, and runtime scale incrementally within one system.
| Modular (M90S-12S) | Traditional UPS | |
|---|---|---|
| Capacity scaling | Add 6 kW modules to 48 kW | Fixed capacity |
| Redundancy | Built-in N+1 | Requires multiple systems |
| Runtime | Modular battery expansion | Less flexible |
| Maintenance | Hot-swap, module-level service | Full-system service |
| Lifecycle | Extend capacity in place | Replace at capacity |
Single-phase modular vs three-phase
The M90S-12S introduces a key infrastructure decision: keep scaling within single-phase architecture, or transition to a three-phase UPS. As a high-capacity single-phase platform, it provides a practical alternative to three-phase systems across the 6–48 kW range.
| Single-phase modular (M90S-12S) suits | Three-phase becomes appropriate when |
|---|---|
| Three-phase utility is unavailable (common in residential and remote sites) | Facility power density exceeds practical single-phase limits |
| Electrical upgrades are cost-prohibitive or disruptive | Infrastructure is designed for large centralized UPS |
| Infrastructure needs 20–40 kW without facility redesign | Enterprise-scale expansion is required |
| Deployment speed and simplicity are priorities |
Eight capacities in one enclosure
| Model | Capacity | Power modules | Max charge current |
|---|---|---|---|
| M90S12S6K | 6 kVA / 6 kW | 1 × 6 kW | 4 A |
| M90S12S12K | 12 kVA / 12 kW | 2 × 6 kW | 8 A |
| M90S12S18K | 18 kVA / 18 kW | 3 × 6 kW | 12 A |
| M90S12S24K | 24 kVA / 24 kW | 4 × 6 kW | 16 A |
| M90S12S30K | 30 kVA / 30 kW | 5 × 6 kW | 20 A |
| M90S12S36K | 36 kVA / 36 kW | 6 × 6 kW | 24 A |
| M90S12S42K | 42 kVA / 42 kW | 7 × 6 kW | 28 A |
| M90S12S48K | 48 kVA / 48 kW (240/120 V only) | 8 × 6 kW | 32 A |
One 12-slot enclosure (23.6 × 36.0 × 79.1 in) holds (8) universal slots (power or battery) plus (4) battery-only slots — a maximum of eight 6 kW power modules. The 48 kW rating requires 240/120 V output; at 208/120 V the maximum is 42 kW (seven power modules). For N+1, add one power module beyond the load, so redundancy is available up to 42 kW (seven load modules plus one redundant); at 48 kW all eight power slots carry load, so the 48 kW configuration is a maximum-capacity, non-redundant build. Input and output are hardwired (2PH+N+G in, 2PH+N out); charging is 4 A per power module, adjustable.
Runtime by load and battery configuration
The M90S-12S supports two battery strategies: internal battery modules at ±96 VDC, or the M90-BC external battery cabinet at ±120 VDC for higher capacities and longer runtimes. Values are minutes; an asterisk marks runtimes that need an additional power module for recharge, and a dash means that count does not apply to the configuration.
