M90C-6S Modular UPS (5–24 kW) | Rack-Mounted 3-Phase UPS System
5–24 kW | 208/120V Three-Phase | Modular Online UPS
Modular three-phase UPS platform engineered for rack-integrated deployment, scalable capacity growth, and N+1 redundancy in federal, healthcare, and distributed infrastructure environments.
5–24 kW · 208 / 120 VAC Three-Phase · Scalable Rack-Integrated Online Modular UPS · N+1 · TAA
M90C-6S scalable three-phase modular rack UPS
The M90C-6S is a scalable, rack-integrated three-phase modular UPS for environments where power needs exceed a rack UPS but don’t justify facility-level infrastructure. Built on a 6-slot architecture using hot-swappable 5 kW and 8 kW power modules, it scales from 5 kW to 24 kW in a single rack footprint — with N+1 redundancy, modular battery and runtime expansion, and a clear upgrade path. Unity output power factor (kVA = kW), up to 98% ECO efficiency, a full wrap-around maintenance bypass, configurable receptacle panels, and TAA compliance for federal and regulated environments.
Rack-integrated three-phase that scales
The M90C-6S defines the rack-integrated three-phase modular UPS category — bridging the gap between single-phase rack UPS (such as the J90 and P91) and facility-level platforms (such as the M90U and Li90). Capacity is added incrementally by installing 5 kW or 8 kW power modules, redundancy is configured as N+1 within the same system, and runtime is expanded by adding battery modules — reducing overprovisioning and aligning UPS capacity with actual load growth. Hot-swappable power and battery modules and an in-frame maintenance bypass keep service fast and front-accessible.
TAA compliant for federal & regulated environments
With TAA compliance, modular front-access serviceability, and a rack-integrated footprint, the M90C-6S suits federal and government IT, healthcare systems, secure network environments, and other regulated deployments — supporting phased modernization and standardized service workflows without floor-standing facility infrastructure.
What the M90C-6S delivers
Add 5 kW or 8 kW power modules to grow from 5 kW to 24 kW within a single rack footprint — matching capacity to load without oversizing or replacing the chassis.
Configure a redundant power module for the highest availability inside one frame — available up to 10 kW on the 5 kW-module line and 16 kW on the 8 kW-module line (two load modules plus one redundant). The top configuration of each line (15 kW / 24 kW, three power modules) uses all three power slots and is non-redundant.
Unity PF (kVA = kW) delivers full usable watts — reducing oversizing — with best-in-class efficiency up to 98% ECO mode for the lowest energy consumption and heat output.
Power and battery modules are hot-swappable from the front for rapid service, and a full wrap-around maintenance bypass (behind the hinged LCD) transfers the load to utility power for safe on-site maintenance.
Output on terminal blocks and/or up to four configurable receptacle panels (5-20R, L6-20R/30R, L14-30R, L21-20R/30R, C19), letting you tailor distribution to the deployment.
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 status.
The scalable rack three-phase tier
The M90C-6S is selected when three-phase power is required inside the rack, infrastructure is scaling beyond a 3 kVA rack UPS, redundancy is needed without multiple distributed units, or a clear upgrade path to larger modular systems is required.
Step down to the M90C-2S (5–8 kW) for smaller rack deployments, or up to the facility-scale M90U and lithium Li90 when capacity outgrows the rack.
Scale incrementally instead of oversizing
Traditional three-phase UPS are fixed-capacity, floor-standing, and difficult to scale. The M90C-6S enables incremental capacity growth, rack-based deployment, integrated N+1 redundancy, and simplified long-term expansion.
| Architecture | M90C-6S (modular) | Traditional three-phase |
|---|---|---|
| Capacity scaling | Add 5 / 8 kW modules as needed | Fixed capacity |
| Deployment | Rack-integrated | Floor-standing |
| Redundancy | Built-in (N+1) | Requires multiple systems |
| Runtime | Modular battery expansion | Less flexible |
| Long-term expansion | Simplified, in-chassis | Replace at capacity |
Six configurations, 5–24 kW
| Model | Capacity (kVA / kW) | Power modules | Max battery charging | Architecture |
|---|---|---|---|---|
| M90C-6S5K | 5 / 5 | 1 × 5 kW | 4 A | 6-slot, N+1 capable |
| M90C-6S10K | 10 / 10 | 2 × 5 kW | 8 A | 6-slot, N+1 capable |
| M90C-6S15K | 15 / 15 | 3 × 5 kW | 12 A | 6-slot, max capacity (non-redundant) |
| M90C-6S8K | 8 / 8 | 1 × 8 kW | 4 A | 6-slot, N+1 capable |
| M90C-6S16K | 16 / 16 | 2 × 8 kW | 8 A | 6-slot, N+1 capable |
| M90C-6S24K | 24 / 24 | 3 × 8 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 power modules (15 kW with 5 kW modules, 24 kW with 8 kW modules). For N+1, add one power module beyond the load, so redundancy is available up to 10 kW (5 kW modules) or 16 kW (8 kW modules) — two load modules plus one redundant; the 15 kW and 24 kW builds use all three power slots and are non-redundant. Unity output power factor. Battery system is ±96 VDC (default) or ±120 VDC; each battery module (BMXRv2) holds 16 × 12V high-rate cells and an integral DC breaker. Runtime expands by adding battery modules — up to 8 per power module — with the optional BC7 cabinet adding 7 battery slots.
Runtime by load and battery module count
Runtime in minutes by number of installed battery modules, shown for the 5 kW power-module configurations (5 / 10 / 15 kW) and the 8 kW power-module configurations (8 / 16 / 24 kW). The stepped line tracks the six-slot enclosure sharing power and battery slots: cells to its left use battery modules inside the UPS, the next band adds one BC7 cabinet, and the last adds a second — so the internal-battery maximum falls as more power modules are installed (5 modules with one power module, 4 with two, 3 with three).
| 6S UPS | 6S UPS + 1 BC7 | 6S UPS + 2 BC7 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Battery Modules | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 5kW | 12 | 28 | 46 | 66 | 86 | 106 | 121 | 133 | 151* | 170* | 190* | 209* | 228* | 248* | 268* | 288* | 308* |
| 10kW | — | 12 | 20 | 28 | 37 | 46 | 56 | 66 | 76 | 86 | 96 | 106 | 114 | 121 | 127 | 133 | 142* |
| 15kW | — | 7 | 12 | 17 | 23 | 28 | 34 | 40 | 46 | 53 | 59 | 66 | 72 | 79 | 86 | 93 | 100 |
| 6S UPS | 6S UPS + 1 BC7 | 6S UPS + 2 BC7 | |||||||||||||||
| Battery Modules | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 8kW | 6 | 16 | 26 | 37 | 49 | 61 | 73 | 86 | 99* | 110* | 119* | 127* | 135* | 147* | 159* | 170* | 182* |
| 16kW | — | 6 | 11 | 16 | 21 | 26 | 32 | 37 | 43 | 49 | 55 | 61 | 67 | 73 | 79 | 86 | 92* |
| 24kW | — | — | 6 | 9 | 13 | 16 | 19 | 23 | 26 | 30 | 33 | 37 | 41 | 45 | 49 | 53 | 57 |
Estimated minutes; values vary with battery age and site conditions. A maximum of 8 battery modules is supported per power module; an asterisk (*) indicates a configuration where an additional power module is required for battery recharge. Contact Xtreme Power at (800) 582-4524 or sales@xpcc.com for longer runtimes.
Flexible electrical integration
The M90C-6S supports corded input for deployments up to 8 kW (L21-20P at 5 kW, L21-30P at 8 kW) and hardwired input for larger systems. Output lands on terminal blocks and/or up to four configurable receptacle panels, so distribution can be tailored across retrofit and standardized environments.
| Receptacle panel | Outlet configuration |
|---|---|
| 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 |
| I | (1) L21-20R + breaker |
| J | (1) L21-30R + breaker |
Install up to 4 receptacle panels per enclosure, or use hardwired terminal blocks. Panels I and J include an integral breaker.
Where the M90C-6S is deployed
The M90C-6S is deployed across federal and government IT infrastructure, healthcare systems, edge compute and micro data centers, industrial automation, and secure network environments — wherever scalable, redundant three-phase protection is needed at the rack level. Capacity guidance: 5–8 kW for initial deployment, 10–16 kW for growing infrastructure, 15–24 kW fully populated. N+1 redundancy is available up to 10 kW (5 kW modules) or 16 kW (8 kW modules); the fully populated 15 kW / 24 kW builds are maximum-capacity and non-redundant.
Rack installation
The M90C-6S mounts in a standard equipment rack with the optional M90C Rack Mount Kit, which includes the ramps, rails and mounting hardware and is ordered separately. Unlike the 2-slot models, the 6-slot enclosure is not rackmount-ready as shipped. Front service access and modular components keep maintenance simple either way. The short video below shows the installation approach.
M90C-6S specifications
| Models | M90C-6S 5K / 10K / 15K (5 kW modules) and 8K / 16K / 24K (8 kW modules) — unity PF (kVA = kW) |
| Topology | Modular online double-conversion, three-phase; 6-slot (3 universal + 3 battery-only); hot-swap power and battery modules |
| Input | 120/208V three-phase, 50/60 Hz auto-sensing (3PH+N+G); corded (≤8 kW: L21-20P / L21-30P) or hardwired |
| Output | 120/208V, 50/60 Hz ±0.1 Hz (3PH+N); terminal blocks and/or up to 4 receptacle panels; THD ≤2% (linear), ≤3% (non-linear) |
| Efficiency | Up to 98% ECO mode, 93% 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 10 kW (5 kW modules) / 16 kW (8 kW modules) — two load modules plus one redundant; 15 kW and 24 kW are maximum-capacity, non-redundant builds |
| Battery system | Nominal ±96 VDC or ±120 VDC (±96 V default); max charging 4 / 8 / 12 A by configuration; battery module = 16 × 12V high-rate cells; up to 8 battery modules per power module |
| Power module | 16.3 × 24 × 5.2 in, 38 lbs (rectifier, charger, inverter, static switch) |
| Battery module | BMXRv2 — 16 × 12V high-rate cells with integral DC breaker; 16.3 × 24 × 5.2 in, 107 lbs |
| Enclosure | 17.4 × 33.7 × 45.5 in (UPS & BC7); UPS 169 lbs, BC7 162 lbs; optional BC7 adds 7 battery slots |
| Maintenance bypass | Full wrap-around, behind the hinged LCD display |
| Display | 5.7-inch graphic system LCD plus 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 | 2 years electronics, 2 years battery (USA and Canada); 1 year outside the USA and Canada; $50,000 load protection policy (USA and Canada) |
| Options | L21-20P (5 kW) / L21-30P (8 kW) line cord, receptacle panels (4 max), extended battery cabinet, 5-year extended warranty |
M90C-6S: common questions
How does the M90C-6S scale from 5 to 24 kW?
Two module sizes in a six-slot enclosure. With 5 kW modules the steps are 5, 10 and 15 kW; with 8 kW modules they are 8, 16 and 24 kW. Three power modules is the maximum, and the remaining slots hold batteries.
What capacity can run N+1?
Up to 10 kW with 5 kW modules, or 16 kW with 8 kW modules: two modules carrying load and a third standing by. The 15 kW and 24 kW builds use all three power slots, so they are maximum-capacity and non-redundant.
Can the M90C-6S be rack mounted?
Yes, with the optional M90C Rack Mount Kit, which includes ramps, rails and mounting hardware and is ordered separately. The 2-slot M90C-2S and M90Ci-2S are rackmount-ready as shipped; the 6-slot models are not.
How is runtime extended?
Battery modules fill the universal and battery-only slots, and the optional BC7 cabinet adds seven more slots. Up to eight battery modules are supported per power module.
Is the M90C-6S TAA compliant?
Yes, and it is UL-1778 (TUV) and cUL listed, with FCC Class A and RoHS. Federal, Department of Defense, VA medical and government research sites are the largest deployment base for the M90C line.
What warranty comes with it?
Two years on electronics and two 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. A five-year extended warranty is available.
Documents and related links
Plan your M90C-6S deployment
Talk to an Xtreme Power specialist about module configuration for 5–24 kW, N+1 redundancy, runtime sizing with the BC7 cabinet, receptacle-panel and electrical integration, and TAA-compliant deployment across federal, healthcare, and distributed infrastructure.