M90S-4S Modular UPS – 6–12kW Scalable Single-Phase UPS with N+1 Redundancy
6–12 kW | 208/120V or 240/120V | Modular Online UPS
Modular single-phase UPS platform engineered for centralized power protection, scalable capacity growth, and N+1 redundancy in commercial, industrial, and distributed infrastructure environments.
6–12 kW · 208/120V or 240/120V · Modular Online Double-Conversion UPS · N+1
M90S-4S scalable modular single-phase UPS
The M90S-4S is the scalable tier of the M90S modular family — a 4-slot online double-conversion UPS that grows from 6 kW to 12 kW on single-phase power. It is built for facilities outgrowing rack UPS but still within single-phase infrastructure, using hot-swappable 6 kW power modules and modular batteries for N+1 redundancy and phased growth. Unity output power factor (kVA = kW), a 5.7″ graphic display, integral maintenance bypass, plug-in L14-30P deployment, and configurable output receptacle panels. TAA compliant; UL-1778 (TUV) / cUL listed.
Scalable power beyond rack UPS
The M90S-4S introduces true modular scalability within single-phase infrastructure — for facilities where power requirements are growing beyond rack UPS capability but remain single-phase. Built on a 4-slot architecture using 6 kW power modules, it scales from 6 kW to 12 kW and supports N+1 redundancy, runtime expansion, and phased deployment within a single platform. Capacity can be added incrementally as load grows, so UPS sizing aligns to actual requirements while preserving flexibility for future expansion.
What the M90S-4S delivers
Add a hot-swappable 6 kW power module to move from 6 to 12 kW within the same frame — capacity aligns to actual load instead of oversizing or replacing the UPS.
Configure redundant power and battery modules for N+1 within one system — the availability of multiple UPS without the footprint, wiring, or management overhead.
Unity PF (kVA = kW) delivers full usable watts with best-in-class efficiency — up to 98% ECO mode — lowering energy cost and heat output, with no need to oversize for a derated power factor.
A factory-installed L14-30P line cord (6 kW) enables deployment without immediate electrical work, and up to two configurable output receptacle panels deliver C19, 5-20R, L6-20R/L6-30R, and L14-30R distribution from the UPS frame.
A 5.7-inch graphic display shows system status and alarms, and each power module carries its own LCD for module-level detail and redundancy state — faster diagnostics and service.
A manual maintenance bypass transfers the critical load to utility power for service without dropping it, and output distribution inside the frame removes external connection components — reducing installation cost.
The scalable modular tier
The M90S-4S sits between the entry M90S-2S and the core M90S-6S — a scalable centralized platform for single-phase infrastructure, typically deployed in electrical rooms supporting distributed infrastructure, where multiple separate UPS would otherwise be required, or in facilities transitioning toward a centralized UPS design.
Choose the M90S-4S for single-phase load growing through 6–12 kW with redundancy headroom; step down to the M90S-2S for a fixed 6 kW entry system, up to the M90S-6S for 6–24 kW, or to the hardwired M90S-12S for 6–48 kW.
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-4S) | Traditional UPS | |
|---|---|---|
| Capacity scaling | Add a 6 kW module to 12 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 |
Flexible electrical integration
The M90S-4S supports simplified deployment using a factory-installed L14-30P input line cord in the 6 kW configuration — enabling installation without immediate electrical infrastructure modification. Output distribution is delivered through terminal blocks and/or up to two configurable receptacle panels, so the UPS can be matched to the connector mix a deployment needs.
| Receptacle panel | Outlets |
|---|---|
| A | (8) 5-20R |
| B | (2) C19 + (4) 5-20R |
| C | L6-30R + (2) C19 |
| D | L14-30R + (2) C19 |
| E | (2) L6-20R + (4) 5-20R |
| F | L6-20R + L6-30R + (4) 5-20R |
| G | L6-30R + (2) L6-20R |
| H | (3) L6-30R |
Up to two receptacle panels per system. Available distribution includes IEC C19, NEMA 5-15R / 5-20R, NEMA L6-20R / L6-30R, and NEMA L14-30R. The L14-30P line cord is an option for 6 kVA configurations; 12 kW configurations are hardwired.
Two capacities in one enclosure
| Model | Capacity | Power modules | Max charge current | Input |
|---|---|---|---|---|
| M90S-4S6K | 6 kVA / 6 kW | 1 × 6 kW | 4 A | L14-30P cord or hardwired |
| M90S-4S12K | 12 kVA / 12 kW | 2 × 6 kW | 8 A | Hardwired (2PH+N+G) |
One 4-slot enclosure (17.4 × 33.7 × 33 in, 130 lb) holds 2 universal slots (power or battery) plus 2 battery-only slots; an optional BC7 cabinet (17.4 × 33.7 × 45.5 in) adds 7 battery slots. For N+1, add one power module beyond the load requirement.
Runtime by load and battery module count
Runtime in minutes by kW configuration and number of installed battery modules, grouped by the battery-cabinet stage required (the 4S enclosure holds 3 internal battery slots in the 6 kW config; each BC7 cabinet adds 7). An asterisk marks runtimes that need an additional power module for recharge; a dash means that module count does not apply to the configuration.
| Load | 4S UPS | 4S UPS + 1 BC7 | 4S UPS + 2 BC7 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | |
| 6 kW | 9 | 22 | 35 | 50 | 66 | 82 | 99 | 113 | 124* | 133* | 148* | 163* | 179* | 194* | 209* |
| 12 kW | — | 9 | 15 | 22 | 28 | 35 | 43 | 50 | 58 | 66 | 74 | 82 | 90 | 99 | 106 |
Estimated minutes; values vary with battery age and site conditions. A maximum of eight battery modules is supported per power module; an asterisk (*) marks runtimes that require an additional power module for battery recharge. For longer runtimes or configurations beyond 15 modules, contact Xtreme Power engineering at (800) 582-4524 or sales@xpcc.com.
Rack deployment
The M90S-4S supports rack-based deployment with integrated mounting hardware and serviceable module access, installing in standard equipment racks while keeping power and battery modules accessible. Watch a short rack-installation overview:
Where the M90S-4S is deployed
The M90S-4S is deployed across single-phase environments where capacity is growing and redundancy matters — telecommunications infrastructure, network distribution rooms, industrial automation, broadcast environments, and commercial infrastructure — typically where load is expected to grow over time, runtime exceeds rack-UPS capability, multiple separate UPS are becoming difficult to manage, or a three-phase upgrade is not practical.
M90S-4S specifications
| Topology | Modular online double-conversion |
| Capacity | 6 kVA / 6 kW and 12 kVA / 12 kW (unity PF, kVA = kW) |
| Input | 120/208V or 120/240V, 50/60 Hz auto-sensing (2PH+N+G); range 152–269 VAC (L-L), 40–70 Hz |
| Output | 120/208V or 120/240V, 50/60 Hz ±0.1 Hz (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; max charging 4 A (6 kW) / 8 A (12 kW), adjustable |
| Power module | 16.3 × 24 × 5.2 in, 38 lb |
| Battery module | 16.3 × 24 × 5.2 in, 107 lb |
| UPS enclosure | 17.4 × 33.7 × 33 in, 130 lb; 4 slots (2 universal + 2 battery-only) |
| BC7 battery cabinet | 17.4 × 33.7 × 45.5 in, 162 lb; 7 additional battery slots |
| Output distribution | Terminal blocks and/or up to two configurable receptacle panels (C19, 5-15/5-20R, L6-20/L6-30R, L14-30R) |
| Input options | L14-30P line cord (6 kVA); receptacle panels (2 max); extended battery cabinet; 5-year extended warranty |
| Display | 5.7″ graphic LCD; per-power-module LCD |
| Communications | RS-232, USB, dry contacts, EPO; (2) intelligent slots (Web/SNMP, Relay, Modbus) |
| Environment | 0–40°C (32–104°F); altitude 5,200 ft; audible noise <58 dBA at 1 m |
| 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-4S deployment
Talk to an Xtreme Power specialist about module configuration, N+1 redundancy, runtime sizing with BC7 battery cabinets, receptacle-panel selection, and phased growth from 6 to 12 kW.
| CAPACITY | Power Rating | 6kVA/6kW | 12kVA/12kW |
| INPUT | Voltage / frequency nominal | 120/208V or 120/240V & 50/60Hz auto-sensing (2PH+N+G) | |
| Voltage / frequency range | 152-269VAC* (L-L) / 40–70Hz | ||
| OUTPUT | Voltage & Frequency | 120/208V or 120/240V & 50/60Hz ± 0.1Hz; (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 | +/-96V | |
| Max charging (adjustable) | 4A | 8A | |
| MODULE DIMENSION | Power module | 16.3”W x 24”D x 5.2”H / 38 lbs | |
| & WEIGHT | Battery module | 16.3”W x 24”D x 5.2”H / 107 lbs | |
| SYSTEM ENCLOSURE | Dimensions & Weight | UPS 17.4”W x 33.7”D x 33”H & 130 lbs / BC7 17.4”W x 33.7”D x 45.5”H & 162 lbs | |
| Maximum Capacity | 12kVA | ||
| Enclosure Capacity | 4 slots including 2 universal slots + 2 battery only slots | ||
| Optional Battery Enclosure | 7 slots for additional battery modules | ||
| Output Connections | Terminal blocks and/or up to 2 receptacle panels | ||
| ENVIRONMENT | Temperature | 0–40°C (32–104°F) | |
| Altitude | 5,200 ft above sea level | ||
| Audible noise | < 58dBA at 1m | ||
| 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 slot for optional cards (Web/SNMP, Relay, Modbus) | ||
| INCLUDED IN BOX | User manual, USB cable, RS-232 cable, ViewPower Software, anchor brackets | ||
| AVAILABLE OPTIONS | L14-30P line cord (6kVA), receptacle panels (2 max), extended battery cabinet, 5 year extended warranty | ||
