M90U-80 Modular UPS – High-Density Three-Phase UPS (15–80kW, 208/120V)
15–80 kW | 208/120V Three-Phase | Modular Online Double-Conversion UPS
High-density modular three-phase UPS engineered for facility infrastructure requiring scalable capacity, N+1 redundancy, and maximum power within a compact electrical room footprint.
15–80 kW · 208/120V Three-Phase · Modular Online UPS · High Density · Single Cabinet · Unity PF
Four power modules, internal batteries and bypass in one cabinet
The M90U-80 is a scalable modular online double-conversion UPS that integrates power electronics, internal batteries, a modular static switch, and front-serviceable maintenance bypass into a single 208/120V three-phase cabinet. It scales from 15 to 80 kW at unity power factor using hot-swappable 15 kW or 20 kW power modules, within a compact electrical-room footprint, with N+1 redundancy and internal modular VRLA batteries. Engineered for data centers, healthcare, telecom, and industrial facilities where capacity, density, and serviceability must be balanced in limited space.
High capacity in a single cabinet
The M90U-80 protects critical data and equipment while supplying clean, network-grade power, and can be configured with a fully redundant power module and battery modules — if one module fails, the remaining modules smoothly take over the load. The independent power modules are hot-swappable without risk to the critical load. By consolidating power, batteries, and bypass into one cabinet, the M90U-80 delivers capacity that traditionally needed multiple cabinets, while keeping modular scalability and redundancy.
Up to 80 kW in a single cabinet footprint
Traditional UPS at this scale often require separate cabinets for power, batteries, and bypass. The M90U-80 integrates all three into a single modular cabinet, minimizing the space those systems normally consume while preserving scalability and redundancy. Capacity is added by installing power modules — up to four per enclosure — so infrastructure grows without adding cabinets or increasing the footprint.
| Integrated function | What it replaces |
|---|---|
| Up to four hot-swappable power modules (15 or 20 kW) | Separate power cabinet / parallel frames |
| Up to sixteen internal VRLA battery modules | External battery cabinets (for standard runtimes) |
| Modular static switch with redundant power supplies | Standalone static-switch assembly |
| Front-mounted maintenance bypass | External / rear maintenance-bypass cabinet |
Built for faster service and visibility
Building on the M90U platform, the M90U-80 adds enhancements that improve usability, serviceability, and system integration — reducing service time and supporting faster deployment.
A 10-in graphic touchscreen provides system status, alarms, and control with improved visibility over standard modular panels.
A front-mounted MBP switch transfers the critical load from UPS to utility for service — no rear access required.
Battery modules connect through a backplane for faster installation and maintenance, with up to sixteen hot-swappable modules.
A modular STS with redundant power supplies improves resilience and simplifies maintenance.
Top-feed input and output cable entry simplifies installation in centralized electrical rooms.
Unity PF (kW = kVA) provides full real capacity for high-density loads with no usable-watt derating.
What the M90U-80 delivers
Scale capacity by adding hot-swappable 15 kW or 20 kW power modules — up to four per enclosure — as load grows.
Up to 80 kW within a single compact cabinet, consolidating multi-cabinet UPS footprints.
Configure a redundant power module (N+1 to 60 kW on 20 kW modules, 45 kW on 15 kW modules) for the highest availability.
Up to sixteen internal VRLA battery modules deliver scalable runtime without external battery cabinets.
Dual- or single-input configurations and top-feed cable entry provide installation flexibility.
An integrated, front-mounted maintenance bypass and modular static switch keep service fast and accessible.
Capacities and module configuration
The enclosure holds up to four power modules. The 20 kW module line scales to 80 kW (4 × 20); a 15 kW module line is also available, scaling to 60 kW (4 × 15). Unity power factor means the kVA and kW ratings are equal.
| Model | Capacity | Power modules | Charge current | Redundancy |
|---|---|---|---|---|
| M90U80-20k | 20 kVA / 20 kW | 1 × 20 kW | 8 A | Single module |
| M90U80-40k | 40 kVA / 40 kW | 2 × 20 kW | 16 A | N+1 to 20 kW |
| M90U80-60k | 60 kVA / 60 kW | 3 × 20 kW | 24 A | N+1 to 40 kW |
| M90U80-80k | 80 kVA / 80 kW | 4 × 20 kW | 32 A | Fully populated — non-redundant |
N+1 protected capacity is one module below the fully populated rating: up to 60 kW with 20 kW modules (3 × 20 active, one redundant) or 45 kW with 15 kW modules. The 80 kW (4 × 20) and 60 kW (4 × 15) ratings are fully populated and non-redundant. Charge current scales with the populated module count (8 / 16 / 24 / 32 A). A 15 kW module line yields 15 / 30 / 45 / 60 kW configurations.
Runtime by battery modules and load
Approximate runtime in minutes with internal VRLA battery modules (4 to 16) by system load. A dash indicates that load is beyond the supported range for that battery configuration. For extended runtimes beyond the internal table, an external battery option is available.
| Battery modules | System load (kVA = kW) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | |
| 4 modules | 34 | 15 | 8.5 | 5.4 | — | — | — | — | — | — | — | — | — | — | — | — |
| 8 modules | 78 | 34 | 21 | 15 | 11 | 8.5 | 6.9 | 5.4 | — | — | — | — | — | — | — | — |
| 12 modules | 115 | 55 | 34 | 24 | 18 | 15 | 12 | 9.9 | 8.5 | 7.3 | 6.4 | 5.4 | — | — | — | — |
| 16 modules | 154 | 78 | 48 | 34 | 26 | 21 | 17 | 15 | 13 | 11 | 9.5 | 8.5 | 7.6 | 6.9 | 6.0 | 5.4 |
Runtimes are approximate, based on fully formed batteries, and vary with battery age, temperature, and site conditions. Battery life is reduced above 30°C and capacity derates above 30°C and 5,200 ft. Contact Xtreme Power at (800) 582-4524 or sales@xpcc.com for runtime sizing.
The high-density member of the M90U family
M90U-80 is the mid-scale, high-density platform within the M90U family — deployed in electrical rooms where space is limited and capacity requirements exceed entry-level modular systems. The entry M90U covers 15–60 kW where space is not the primary constraint; the M90U-140 extends to higher capacity; and the Li90 offers an integrated lithium facility UPS.
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Replace legacy multi-cabinet systems
M90U-80 is commonly deployed to replace legacy multi-cabinet UPS from APC and Eaton — consolidating multiple UPS into a single platform, fitting electrical rooms with limited space, delivering higher capacity within an existing footprint, and adding modular scalability and redundancy.
Where the M90U-80 is deployed
M90U-80 is deployed across environments requiring high-capacity protection within limited space — data center electrical rooms, edge computing, healthcare infrastructure, telecommunications, and industrial facilities.
Approvals and warranty
The M90U-80 carries UL-1778, cUL, FCC Class A, RoHS, and is TAA compliant. It is backed by a 2-year electronics and 2-year battery warranty (USA and Canada).
M90U-80 specifications
| Capacity | 15 / 20 / 30 / 40 / 45 / 60 / 80 kVA = kW (unity PF), from 15 kW or 20 kW modules |
| Topology | Modular online double-conversion, three-phase |
| Input | 208/120V three-phase, 50/60 Hz auto-sensing; range 121–253 VAC (L-L), 40–70 Hz; dual or single input |
| Output | 208/120V; 50/60 Hz ±0.5 Hz; THD <2% at full load |
| Efficiency | Up to 94% online mode, up to 98% ECO mode |
| Overload | 105–110% (60 min); 110–125% (10 min); 126–150% (1 min); >150% (200 ms) |
| Power modules | Up to four hot-swappable 15 kW or 20 kW modules (4 × 20 = 80 kW, or 4 × 15 = 60 kW) |
| Redundancy | N+1 capable — protected ceiling 60 kW (20 kW modules) / 45 kW (15 kW modules); 80 kW and 60 kW fully populated, non-redundant |
| Battery | Internal modular VRLA; ±120 VDC; 4 / 8 / 12 / 16 hot-swappable modules; charge current 8 / 16 / 24 / 32 A (programmable) |
| Static switch | Modular STS with redundant power supplies |
| Bypass | Integrated front-mounted maintenance bypass (external maintenance bypass optional) |
| Enclosure | 23.6"W × 43.3"D × 79.1"H / 657 lb; power module 19.3 × 29.0 × 5.2 in (490 × 736.5 × 133 mm) / 74 lb (20 kVA), 72 lb (15 kVA); battery module 4.3 × 28.5 × 6.5 in / 70 lb |
| Cable entry | Top feed |
| Display | 10-in graphic touchscreen LCD — status and alarms |
| Communications | RS-232, EPO, intelligent slot (Web/SNMP, Modbus), optional relay card; ViewPower software included |
| Environment | 0–40°C (32–104°F); altitude 5,200 ft; audible noise <69 dBA at 1 m |
| Options | External maintenance bypass, 480V input transformer, output distribution, battery temperature sensor |
| Approvals | UL-1778, cUL, FCC A, RoHS, TAA compliant |
| Warranty | 2-year electronics, 2-year battery (USA and Canada) |
M90U-80 — frequently asked questions
Does the fourth module slot add capacity or redundancy?
Either one, but not both at once. With 20 kW modules, four populated slots give 80 kW with no redundancy, or 60 kW with the fourth module held as an N+1 spare. With 15 kW modules the same choice gives 60 kW non-redundant or 45 kW N+1. Decide which you need before sizing, because the protected ceiling is always one module below the fully populated rating.
Should I specify 15 kW or 20 kW power modules?
The module rating sets the capacity ladder. The 20 kW line scales 20 / 40 / 60 / 80 kW; the 15 kW line scales 15 / 30 / 45 / 60 kW. The two ratings cannot be mixed in one frame, so passing 60 kW on a 15 kW system means replacing all four modules with 20 kW units rather than adding one. The cabinet, batteries, static switch and bypass carry over unchanged. Specify 15 kW modules where the load is modest and 15 kW steps suit how it will grow; specify 20 kW where the site may pass 60 kW, to avoid buying a full set of modules twice.
How does unity power factor change the comparison with other UPS?
It changes the usable watts. The M90U-80 is rated at unity, so kVA and kW are the same number and an 80 kVA system delivers 80 kW. A competing 80 kVA system rated at 0.9 power factor delivers 72 kW to the same load. Size on watts rather than kVA, or the two systems will look equivalent on paper when they are not.
Do the internal batteries cover most runtimes, or is an external cabinet needed?
Most standard runtimes are covered internally. Up to sixteen VRLA battery modules mount in the same cabinet, giving roughly 37 minutes at 20 kVA and about 5 minutes at full 80 kVA load. Beyond what the internal table shows, an external battery option is available. Runtimes assume fully formed batteries and vary with age, temperature and site conditions.
Can capacity be added later without dropping the load?
Yes. Power modules and battery modules are hot-swappable, so capacity is added by installing modules into free slots rather than replacing the frame or scheduling an outage. Modules added later must match the rating already installed, since the two ratings cannot be mixed in one frame. Moving a 15 kW system up to the 20 kW line is possible and keeps the same cabinet, but it means changing the whole set of modules rather than adding to it. The front-mounted maintenance bypass transfers the critical load to utility for service without rear access to the cabinet.
What are the input and cable entry options?
The M90U-80 accepts 208/120V three-phase at 50/60 Hz with auto-sensing, over an input range of 121–253 VAC line to line, in either dual-input or single-input configuration. Cable entry is top feed for both input and output, which suits centralized electrical rooms where conduit drops from above.
Documents and related links
Plan your M90U-80 deployment
Talk to an Xtreme Power specialist about high-density modular UPS sizing, phased capacity expansion, N+1 redundancy, internal battery runtime, dual-input integration, and APC / Eaton multi-cabinet replacement within a constrained electrical-room footprint.
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