M90Si-6S Modular UPS | 10-30 kW Scalable 208-240V Single-Phase N+1
10–30 kW | 208–240V | Modular Online UPS
Modular single-phase UPS platform engineered for global infrastructure requiring scalable capacity, N+1 redundancy, and centralized power protection across telecommunications, edge, and distributed commercial environments.
10–30 kW · 208–240 VAC · Modular Online Double-Conversion UPS · N+1 · International
M90Si-6S scalable modular single-phase UPS
The M90Si-6S is a modular online double-conversion UPS for 208–240 V international single-phase infrastructure that needs higher capacity, redundancy, and flexible deployment. Built on a 6-slot architecture using hot-swappable 10 kW power modules, it scales from 10 kW to 30 kW with N+1 redundancy and modular battery expansion in a single platform — centralized, high-capacity continuity for global edge and distributed sites without moving to three-phase. Unity output power factor (kVA = kW), up to 98% ECO efficiency, and a full wrap-around maintenance bypass for service without dropping the load.
Core modular platform for global single-phase
The M90Si-6S is designed for international single-phase environments that require higher capacity and flexible deployment. Capacity is increased incrementally by adding 10 kW power modules, while redundancy is implemented with an N+1 configuration in the same system — letting infrastructure planners align UPS capacity with actual load while keeping flexibility for future expansion. Hot-swappable power and battery modules provide rapid maintenance, and an in-frame maintenance bypass removes the need for external connection components.
What the M90Si-6S delivers
Scale from 10 kW to 30 kW by adding hot-swappable 10 kW power modules, or add battery modules for runtime — matching UPS capacity to load without oversizing or forklift upgrades.
Configure a redundant power module for the highest availability inside a single frame — available up to 20 kW (two load modules plus one redundant), instead of deploying and managing multiple separate UPS. The 30 kW build uses all three power slots for capacity and is non-redundant.
Unity PF (kVA = kW) delivers full usable watts with best-in-class efficiency — up to 98% ECO mode — for the lowest energy consumption and heat output, with no need to oversize for a derated power factor.
Power and battery modules are hot-swappable for rapid maintenance and repair, and a full wrap-around maintenance bypass (behind the hinged LCD) transfers the load to utility power for safe on-site service.
Each power module carries its own LCD for module-level detail and redundancy status, and a 145 mm graphic system display shows overall status and alarms.
Hardwired input and output on terminal blocks — no line cords or receptacle distribution — supporting higher-capacity deployment and alignment with facility-level power architecture.
The core international modular tier
The M90Si-6S is the core modular UPS platform for global single-phase infrastructure — typically deployed in electrical rooms and telecom environments, across distributed international sites, where centralized UPS simplifies multi-system deployment. It is the 208–240 V counterpart to the 120 V M90S family.
The ladder runs from rack to room at 208 to 240 V: the P91g at 1.5 to 3 kVA, the P91 5–10K at 5 to 10 kVA, the M90Si-6S at 10 to 30 kW with N+1 to 20 kW, and the Ai90 at 50 to 70 kW rack-integrated. Where the facility runs three-phase 400 V instead, see the M90Ci-2S (10 kW) and M90Ci-6S (10–60 kW), and for rack-level lithium the J90i.
Scale incrementally instead of oversizing
Traditional UPS systems must be oversized up front or replaced as infrastructure grows. The M90Si-6S lets capacity, redundancy, and runtime scale incrementally within a single system.
| Architecture | Modular UPS (M90Si) | Traditional UPS |
|---|---|---|
| Capacity scaling | Add 10 kW modules as needed | Fixed capacity |
| Redundancy | Built-in (N+1) | Requires multiple systems |
| Runtime | Modular battery expansion | Less flexible |
| Maintenance | Module-level service | Full-system service |
| Lifecycle | Extendable | Replace at capacity |
Three configurations, 10–30 kW
| Model | Capacity (kVA / kW) | Power modules | Max battery charging | Architecture |
|---|---|---|---|---|
| M90Si-6S 10K | 10 / 10 | 1 × 10 kW | 4 A | 6-slot, N+1 capable |
| M90Si-6S 20K | 20 / 20 | 2 × 10 kW | 8 A | 6-slot, N+1 capable |
| M90Si-6S 30K | 30 / 30 | 3 × 10 kW | 12 A | 6-slot, max capacity (non-redundant) |
All models share a 6-slot enclosure (3 universal slots that take a power or battery module, plus 3 battery-only slots) — a maximum of three 10 kW power modules (30 kW). For N+1, add one power module beyond the load, so redundancy is available up to 20 kW (two load modules plus one redundant); at 30 kW all three power slots carry load, so the 30 kW configuration is a maximum-capacity, non-redundant build. Unity output power factor. Battery system is ±192 VDC (default) or ±240 VDC; each battery module holds 32 × 12V 5Ah cells. Up to 8 battery modules are supported per power module; the optional BC-7 (±192 V) or X90-BC (±240 V) cabinet adds 7 battery slots each.
Hardwired electrical integration
The M90Si-6S is designed for hardwired electrical integration within global infrastructure. Unlike smaller plug-and-deploy UPS, it does not use line cords or receptacle-based distribution — input and output land on terminal blocks — supporting higher-capacity deployment, improved electrical reliability, and alignment with facility-level power architecture. M90Si systems support rack-based deployment with integrated mounting and modular access, enabling installation in standard equipment racks while maintaining serviceability.
Runtime by load and battery module count
Runtime in minutes by number of installed battery modules across the 10, 20, and 30 kW configurations. The banner shows the cabinet configuration — internal slots (UPS), plus the optional BC-7 / X90-BC battery cabinets (UPS + 1 BC7, UPS + 2 BC7). The stepped line tracks the six-slot enclosure sharing power and battery slots: the internal-battery maximum falls as more power modules are installed (5 internal modules at 10 kW, 4 at 20 kW, 3 at 30 kW), with each BC7 cabinet adding seven more slots beyond it.
| UPS | UPS + 1 BC7 | UPS + 2 BC7 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Battery modules | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 10 kW | 5 | 14 | 24 | 34 | 44 | 55 | 67 | 79 | 91 | 101 | 109 | 116 | 122 | 133 | 145 |
| 20 kW | — | 5 | 9 | 14 | 19 | 24 | 29 | 34 | 39 | 44 | 50 | 55 | 61 | 67 | 73 |
| 30 kW | — | — | 5 | 8 | 11 | 14 | 17 | 20 | 24 | 28 | 30 | 34 | 37 | 41 | 44 |
Estimated minutes; values vary with battery age and site conditions. A maximum of 8 battery modules can be recharged per power module — an additional power module is required for battery recharge beyond 8 modules. For extended runtimes, consult Xtreme Power Sales regarding the X90-BC (±240 VDC) at (800) 582-4524 or sales@xpcc.com.
Built for global edge and distributed infrastructure
Many international deployments run on single-phase power. The M90Si-6S brings centralized UPS protection with scalable capacity and redundancy to these environments — without three-phase electrical infrastructure — across telecommunications and cell-tower sites, edge compute and containerized systems, distributed commercial facilities, industrial automation, broadcast, and remote installations. It is typically selected when infrastructure is expected to grow, redundancy is required in a single system, distributed UPS are hard to manage, runtime exceeds rack-UPS capability, or international deployment standardization is required.
Rack installation
The M90Si-6S ships as a floor-standing enclosure. Rack mounting requires the M90S-RMK rack mount kit, ordered separately, which carries the enclosure in a standard rack with the power and battery modules still serviceable from the front. The short video below shows the installation approach.
M90Si-6S specifications
| Models | M90Si-6S 10K / 20K / 30K — 10 / 20 / 30 kVA = kW (unity PF) |
| Topology | Modular online double-conversion (6-slot; hot-swap power and battery modules) |
| Input | 230V single-phase, 50/60 Hz auto-sensing; range 110–300 VAC (load-dependent), 40–70 Hz |
| Output | 208 / 220 / 230 / 240 VAC, 50/60 Hz ±0.1 Hz; hardwired terminal blocks |
| Efficiency | Up to 98% ECO mode, 94% online mode |
| Overload | 100–110% for 30 min; 110–130% for 5 min; 130–150% for 10 s; >150% for 200 ms |
| Redundancy | N+1 capable up to 20 kW (two load modules plus one redundant); 30 kW is a maximum-capacity, non-redundant build |
| Battery system | Nominal ±192 VDC (default) or ±240 VDC; module = 32 × 12V 5Ah; max charging 4 A (10K) / 8 A (20K) / 12 A (30K) |
| Slots | 6 slots: 3 universal (power or battery) + 3 battery-only; up to 8 battery modules per power module |
| Battery cabinets | Optional BC-7 (±192 V) or X90-BC (±240 V); 7 additional battery slots each |
| Power module | 414 × 610 × 132 mm, 17 kg (PFC rectifier, charger, inverter, control) |
| Battery module | 414 × 610 × 132 mm, 49 kg |
| System enclosure | 442 × 856 × 1156 mm (UPS & BC); UPS 82 kg, BC 73.5 kg |
| Display | 145 mm graphic system LCD (status and alarms) plus per-power-module LCD |
| Maintenance bypass | Full wrap-around, located behind the hinged LCD display |
| Communications | RS-232, USB, dry contacts, EPO; (2) intelligent slots (Web/SNMP, Relay, Modbus) |
| Environment | 0–40°C (32–104°F); altitude 1,585 m; audible noise <58 dBA at 1 m |
| Approvals | CE, RoHS, and TAA compliant |
| Warranty | 3 years electronics, 3 years battery (USA and Canada); 1 year outside the USA and Canada; $50,000 load protection policy (USA and Canada) |
| Included | User manual, USB cable, RS-232 cable, ViewPower software, anchor brackets |
M90Si-6S: common questions
What is the difference between the M90Si-6S and the M90S-6S?
Voltage and module size. The M90Si-6S is built for 208 to 240V international single-phase service and uses 10 kW power modules, scaling 10, 20 or 30 kW. The M90S-6S is the North American 208/120V or 240/120V platform and uses 6 kW modules, scaling 6 to 24 kW.
Can the M90Si-6S run N+1?
Yes, at 10 kW and 20 kW. Three power modules is the maximum, so the 30 kW configuration uses all three power slots and is a maximum-capacity, non-redundant build. At 20 kW the third module is the N+1 spare.
How are the six slots allocated?
Three universal slots take either a power or a battery module, and three are battery-only. Internal battery capacity therefore falls as power modules are added. An optional BC-7 cabinet (±192 V) or X90-BC cabinet (±240 V) adds seven more battery slots each, and up to eight battery modules are supported per power module.
How is it connected?
Hardwired input and output on terminal blocks, with no line cords or receptacle distribution. That suits the capacity and aligns with facility-level electrical design. The enclosure ships with anchor brackets.
Can the M90Si-6S be rack mounted?
Yes, with the M90S-RMK rack mount kit, ordered separately. The enclosure ships floor-standing; the kit carries it in a standard rack with the modules still serviceable from the front. A short installation video is on this page.
What warranty comes with the M90Si-6S?
The same terms as the M90S family: three years on electronics and three years on the battery in the USA and Canada, one year outside the USA and Canada, with a $50,000 connected-equipment load protection policy in the USA and Canada.
What approvals does it carry?
CE, RoHS and TAA compliant. The North American M90S platforms carry UL-1778 (TUV) and cUL instead, which is the usual split between the international and domestic models.
Documents and related links
Plan your M90Si-6S deployment
Talk to an Xtreme Power specialist about module configuration for 10–30 kW, N+1 redundancy, runtime sizing with the BC-7 / X90-BC cabinets, hardwired electrical integration, and standardizing modular UPS across international single-phase sites.