M90S-12S Modular UPS – 6–48kW High-Capacity Single-Phase UPS with N+1 Redundancy
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. 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. 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 — the availability of multiple UPS without the footprint, wiring, or management overhead.
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 | 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. For N+1, add one power module beyond the load requirement. 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.
Internal battery modules · ±96 VDC
| Load | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| 6 kW | 9 | 23 | 37 | 53 | 69 | 86 | 103 | 117 | 127* | 139* |
| 12 kW | — | 9 | 16 | 23 | 30 | 37 | 45 | 53 | 61 | 69 |
| 18 kW | — | — | 9 | 14 | 18 | 23 | 27 | 32 | 37 | — |
| 24 kW | — | — | 6 | 9 | 13 | 16 | 19 | 23 | — | — |
| 30 kW | — | — | — | 7 | 9 | 12 | 15 | — | — | — |
| 36 kW | — | — | — | — | 7 | 9 | — | — | — | — |
| 42 kW | — | — | — | — | 6 | — | — | — | — | — |
With M90-BC external battery cabinet · ±120 VDC (no internal batteries)
| Load | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 |
|---|---|---|---|---|---|---|---|---|
| 6 kW | 32 | 77 | 127 | 175 | 228* | 285* | 337* | 391* |
| 12 kW | 14 | 32 | 53 | 77 | 103 | 127 | 150 | 175 |
| 18 kW | 7 | 19 | 32 | 46 | 61 | 77 | 94 | 112 |
| 24 kW | — | 14 | 22 | 32 | 42 | 53 | 65 | 77 |
| 30 kW | — | 10 | 17 | 24 | 32 | 40 | 49 | 58 |
| 36 kW | — | 7 | 14 | 19 | 25 | 32 | 39 | 46 |
| 42 kW | — | 5 | 11 | 16 | 21 | 26 | 32 | 38 |
| 48 kW | — | — | 9 | 14 | 17 | 22 | 27 | 32 |
Estimated minutes; values vary with battery age and site conditions. Internal config: maximum 8 battery modules per power module; 48 kW operates with the M90-BC external cabinet. With M90-BC: no internal batteries in the UPS enclosure, maximum 16 battery modules per power module (1 A per string). An asterisk (*) marks runtimes requiring an additional power module for recharge. For longer runtimes or custom configurations, contact Xtreme Power engineering at (800) 582-4524 or sales@xpcc.com.
Where the M90S-12S is deployed
The M90S-12S is deployed across high-capacity single-phase environments — large residential and whole-home UPS systems, telecommunications and cell-tower infrastructure, remote and off-grid installations, industrial automation, commercial electrical rooms, and distributed compute infrastructure — typically where 30 kVA+ capacity is required on single-phase power, three-phase is not available or practical, centralized redundancy is needed, or managing multiple distributed UPS has become difficult.
Electrical integration
Unlike the smaller M90S platforms, the M90S-12S uses hardwired input and output rather than line cords or receptacle-based distribution. This supports higher power levels, improved electrical reliability, and alignment with facility-level power architecture — the enclosure ships with standard anchor brackets for installation in dedicated electrical infrastructure. For architecture context, see power architecture planning →
M90S-12S specifications
| Topology | Modular online double-conversion |
| Capacity | 6 / 12 / 18 / 24 / 30 / 36 / 42 / 48 kW (unity PF, kVA = kW) — 1 to 8 power modules |
| Input | 120/208V or 120/240V, 50/60 Hz auto-sensing (2PH+N+G) |
| Output | 120/208V or 120/240V, 50/60 Hz auto-sensing (2PH+N) |
| Efficiency / THD | Up to 98% ECO mode, 93% online mode; ≤2% (linear), ≤3% (non-linear) |
| Overload | 100–110% for 30 min; 110–130% for 5 min; 130–150% for 10 s; >150% for 200 ms |
| Battery system | Nominal ±96 VDC (default) or ±120 VDC; max charging 4 A per power module (adjustable) |
| Power module | 16.3 × 24 × 5.2 in, 38 lb (rectifier, inverter, static switch) |
| Battery module (M90S-BMXRV2) | 16.3 × 24 × 5.2 in, 107 lb |
| Battery module (M90-BCBAT) | 7.3 × 38.5 × 3.2 in, 85 lb |
| Enclosure (M90S-12S) | 23.6 × 36.0 × 79.1 in, 586 lb without modules; 12 slots ((8) universal + (4) battery-only) |
| M90-BC external battery cabinet | 23.6 × 43.8 × 79.1 in, 416 lb without modules |
| Maintenance bypass | Integral, manual |
| Display | 10″ system touch LCD; per-power-module LCD |
| Communications | RS-232, USB, dry contacts, EPO; (2) intelligent slots (Web/SNMP, Relay, Modbus) |
| Installation | Hardwired input and output; standard anchor brackets included |
| Environment | 0–40°C (32–104°F); altitude 5,200 ft |
| Approvals | UL-1778 (TUV), cUL, FCC Class A, RoHS; TAA compliant |
| Warranty | 3 years electronics, 3 years battery (USA and Canada) |
Documents and related links
Plan your M90S-12S deployment
Talk to an Xtreme Power specialist about module configuration, N+1 redundancy, runtime sizing with internal batteries or the M90-BC cabinet, single-phase vs three-phase strategy, and phased capacity growth to 48 kW.
| MODEL NUMBER | M90S-12S6K | M90S-12S12K | M90S-12S18K | M90S-12S24K | M90S-12S30K | M90S-12S36K | M90S-12S42K | M90S-12S48K | |
| CAPACITY | Power Rating | 6kW | 12kW | 18kW | 24kW | 30kW | 36kW | 42kW | 48kW |
| INPUT | Voltage/Frequency Nominal | 120/208V or 120/240V // 50/60Hz auto-sensing | 120/240V | ||||||
| Connections | 2PH+N+G | ||||||||
| OUTPUT | Voltage & Frequency | 120/208V or 120/240V // 50/60Hz auto-sensing | 120/240V | ||||||
| Connections | 2PH+N | ||||||||
| Efficiency / THD (full load) | Up to 98% ECO mode, 93% online mode / ≤2% (Linear load);≤3% (Non linear load) | ||||||||
| Overload Capacity | 100% – 110% for 30 min; 110% – 130% for 5min; 130% – 150% for 10s; > 150% for 200ms | ||||||||
| BATTERY SYSTEM | Nominal Voltage | +/-96VDC (default) or +/-120VDC | |||||||
| Max charging (adjustable) | 4A per Power Module | ||||||||
| MODULE | Power Module | 16.3”W x 24”D x 5.2”H / 38 lbs | |||||||
| DIMENSIONS | Battery Module (M90S-BMXRV2) | 16.3”W x 24”D x 5.2”H / 107 lbs | |||||||
| & WEIGHT | Battery Module (M90-BCBAT) | 7.3”W x 38.5”D x 3.2”H / 85 lbs | |||||||
| ENCLOSURE | M90S-12S UPS | 23.6”W x 36.0” D x 79.1”H // 586 lbs without modules | |||||||
| DIMENSIONS & WEIGHTS | M90-BC External Battery Cabinet | 23.6”W x 43.8” D x 79.1”H // 416 lbs without modules | |||||||
| ENVIRONMENT | Temperature | 0–40°C (32–104°F) | |||||||
| Altitude | 5,200 ft above sea level | ||||||||
| APPROVALS | UL-1778 (TUV), cUL, FCC A, RoHS | ||||||||
| WARRANTY | 3 year electronics, 3 year battery (USA and Canada) | ||||||||
| COMMUNICATIONS INTERFACE | RS-232, USB, dry contacts, EPO, (2) intelligent slots for optional cards (Web/SNMP, Relay, Modbus) | ||||||||
| INCLUDED IN BOX | User manual, USB cable, RS-232, ViewPower software, standard anchor brackets | ||||||||
