X90-2S Modular UPS – 50–140kW 480V Integrated UPS System
50–140 kW | 480V | Modular Three-Phase UPS
Scalable, fully integrated 480V UPS system designed for critical infrastructure requiring higher capacity, redundancy, and simplified deployment within a compact footprint.
Scalable Modular Three-Phase UPS · 480V 3W + G & 480/277V 4W + G
X90-2S Modular UPS
A scalable, fully integrated 480V UPS system for critical infrastructure needing higher capacity, redundancy, and simplified deployment within a compact footprint. Online double-conversion protection with hot-swappable power and battery modules, integrated batteries, and maintenance bypass in a single cabinet. Available in a 480V three-wire version and a 480/277V four-wire version with distributed neutral.
↓ 3W + G datasheet (PDF)↓ 4W + G datasheet (PDF)
Key specifications
Capacity growth in one cabinet
The X90-2S is designed for 480V environments that need higher capacity than compact systems while keeping a simplified, integrated architecture. Power modules, batteries, and maintenance bypass are contained within a single enclosure — eliminating separate battery cabinets in many deployments while enabling expansion within the same footprint. Built around one or two 50 or 70 kW power modules, the X90-2S scales from 50 to 140 kW, with internal batteries supporting loads up to 100 kW in the single cabinet. Both the three-wire and four-wire versions share the same cabinet, modules, runtimes, and service architecture — only the input and output topology differs.
Three-wire or four-wire
The choice comes down to what is downstream. If every load on the UPS is three-phase, or if line-to-neutral loads are already served by a separate distribution path, the three-wire version is the simpler and less expensive installation. If the facility feeds 277VAC line-to-neutral branch circuits — lighting, single-phase mechanical, or mixed commercial loads — the four-wire version carries the neutral through the UPS and removes an entire piece of downstream equipment from the design.
X90-2S 3W + G — 480V three-wire
480VAC three-phase in and out. The right choice where the connected load is entirely three-phase and no neutral needs to pass through the UPS. Fewer conductors, simpler terminations.
X90-2S 4W + G — 480/277V four-wire
480/277VAC with a distributed neutral. 277VAC line-to-neutral loads connect directly — no downstream step-down transformer, and no separate distribution path for single-phase branch circuits.
Unbalanced loading (4W + G)
The four-wire topology carries 100% unbalanced single-phase load across phases, so branch circuits do not have to be balanced by design or rebalanced as the facility changes.
Everything else is shared
Same cabinet and footprint, same 50/70 kW power modules, same battery modules and runtimes, same 65 kAIC breakers, bypass, touchscreen, and service access. The version decision does not change the rest of the design.
What defines the X90-2S
Highest availability
Configurable with redundant power and battery modules — N+1 within installed slot capacity for continuous uptime.
High-efficiency operation
Up to 96.5% in online mode and 99% in ECO mode, reducing energy cost in continuous duty.
50 or 70 kW power modules
One or two hot-swappable power modules scale the system from 50 kW up to 140 kW.
Integrated batteries
Internal batteries provide up to 6 minutes at 100 kW — no external enclosure required up to 100 kW.
Full front access
No rear clearance needed for maintenance — supports against-wall and tight-room installs.
Integral maintenance bypass
Front bypass enables service and repair with no external bypass gear.
10″ touchscreen LCD
Graphic display of real-time status and alarms.
277V loads direct (4W + G)
The four-wire version supports 277VAC line-to-neutral branch circuits straight off the UPS output, eliminating a downstream transformer.
Dual or single input
Flexible input configuration for maximum installation flexibility.
Top cable access (standard)
Optional 6″ side-car kit adds bottom cable entry (increases width by 6″).
The X90 platform family
X90-2S is the scalable integrated platform within the X90 family — used in data centers, industrial systems, medical environments, and modular infrastructure needing higher capacity and redundancy. The family scales on a shared architecture:
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See the full platform: X90 Modular UPS Series →
Scale without the multi-cabinet footprint
Traditional modular UPS systems often require external battery cabinets and additional floor space as capacity increases. The X90-2S integrates runtime and maintenance bypass into a single cabinet, enabling scalable capacity without the footprint and complexity of multi-cabinet systems — for higher power density and simplified deployment while maintaining full system performance.
Compare the X90-2S against Eaton 93PM, APC Galaxy VS, and Vertiv APM2: X90-2S UPS comparisons →
Integrated runtime, redundancy, and X90-BC expansion
The integrated battery system provides internal runtime suitable for generator ride-through and short-duration outages — up to 6 minutes at 100 kW. The modular architecture supports redundancy and serviceability through hot-swappable power and battery modules, allowing maintenance without system downtime. For extended runtime or 140 kW configurations, the optional X90-BC battery cabinet adds up to 36 battery modules.
| Load ↓ / modules → | Requires X90-BC battery cabinet | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | 16 | 20 | 24 | 28 | 32 | 36 | 40 | 44 | 48 | 52 | 56 | |
| 30 kW | 15 | 21 | 27 | 34 | 41 | 48 | 56 | 63 | 71 | 79 | 87 | 95 |
| 50 kW | 7 | 11 | 15 | 18 | 22 | 26 | 30 | 34 | 38 | 43 | 47 | 52 |
| 70 kW | – | 7 | 10 | 12 | 15 | 17 | 20 | 23 | 26 | 28 | 31 | 35 |
| 80 kW | – | 6 | 8 | 10 | 13 | 15 | 17 | 19 | 22 | 24 | 27 | 29 |
| 100 kW | – | – | 6 | 7 | 9 | 11 | 13 | 15 | 17 | 18 | 20 | 22 |
| 140 kW | – | – | – | – | 6 | 7 | 8 | 10 | 11 | 12 | 14 | 15 |
Runtimes are identical for the 3W + G and 4W + G versions. Runtimes in minutes; vary with battery age and site conditions. Modules 12–20 are internal to the UPS cabinet (4/8/12/16/20 installed); shaded columns (24–56) require the optional X90-BC battery cabinet. 140 kW configurations require X90-BC for meaningful runtime. N+1 redundancy is configured within installed slot capacity and is not implied at a frame’s fully-populated maximum.
Model selection & technical summary
| Model — 3W | Model — 4W | Power modules | Power rating | Charge current | Internal battery modules |
|---|---|---|---|---|---|
| X90-2S50k | X902S-4W50K | 1 × 50 kW | 50 kVA / 50 kW | 18 A | 4 / 8 / 12 / 16 / 20 |
| X90-2S70k | X902S-4W70K | 1 × 70 kW | 70 kVA / 70 kW | 18 A | 4 / 8 / 12 / 16 / 20 |
| X90-2S100k | X902S-4W100K | 2 × 50 kW | 100 kVA / 100 kW | 36 A | 4 / 8 / 12 / 16 / 20 |
| X90-2S140k | X902S-4W140K | 2 × 70 kW | 140 kVA / 140 kW | 36 A | 4 / 8 / 12 / 16 / 20 |
Shared specifications
- Topology: Online double-conversion (continuous, conditioned output)
- Capacity: 50–140 kW — one or two 50 / 70 kW power modules (kVA = kW)
- Input — 3W + G: 480VAC three-phase, 50/60 Hz auto-sensing; range 480VAC ±20%, 40–70 Hz; dual or single input
- Input — 4W + G: 480/277VAC (4W + G), 50/60 Hz auto-sensing; range 480VAC ±20%, 40–70 Hz; dual or single input
- Output — 3W + G: 480VAC three-phase, 50/60 Hz auto-sensing
- Output — 4W + G: 480/277VAC (4W + G) with distributed neutral, 50/60 Hz auto-sensing
- Load unbalance (4W + G): 100% unbalanced load capability
- Efficiency: Up to 96.5% online mode; 99% ECO mode
- Overload: 105–110% for 60 min; 110–125% for 10 min; 126–150% for 1 min; >150% for 200 ms
- SCCR: 65 kAIC breakers (input, output & maintenance bypass)
- Battery: ±240 VDC nominal; 4 / 8 / 12 / 16 / 20 internal modules; programmable charge 18 A (50/70 kW) or 36 A (100/140 kW); module = 10× 12V 580W
- Extended runtime: Optional X90-BC cabinet adds up to 36 battery modules (56 total)
- UPS cabinet (W×D×H): 23.6 × 42 × 79 in · 864 lbs
- X90-BC cabinet (W×D×H): 23.6 × 42 × 79 in · 576 lbs empty, plus 70 lb per battery module (up to 36)
- Module size: Power module 17.2×29.5×5.1 in / 106 lbs · battery module 17.2×29.5×5.25 in / 70 lbs
- Display: 10″ color touchscreen
- Cable entry: Top entry standard; optional 6″ side-car kit for bottom entry (adds 6″ width)
- Environment: 0–40°C (32–104°F); up to 5,200 ft; < 69 dBA at 1 m
- Communications: RS-232, EPO, relays, intelligent slot for optional Web/SNMP or Modbus card
- Approvals: UL-1778, cUL, FCC Class A, RoHS, TAA
- Warranty: Bundled start-up and 2 years on-site (USA and Canada); 1 year outside
- Included: User manual, RS-232 cable, unloading ramp, ViewPower software
- Options: External maintenance bypass, battery temperature sensor, side-car kit
Need protection inside the rack?
Ai90 — rack-integrated three-phase UPS Coming soon
The Ai90 delivers 480V three-phase protection in a comparable capacity class — but in a rack-mounted form factor that also integrates output distribution. Power conversion, batteries, bypass, and a PDU live in a single rack system, sized for high-density compute and AI infrastructure where the UPS belongs in the rack rather than on the floor. The Ai90 covers 50–70 kW, so it overlaps the lower half of this platform’s range. It is not yet shipping — contact Xtreme Power for availability and to be notified at release.
X90-2S 4W vs the Eaton 93PM 100 kW 4W
Both are transformer-free online double-conversion UPS offered in 480V three-wire or 480/277V four-wire form, and both are TAA compliant. Compared at the same cabinet class — Eaton’s 22-inch slim chassis against the X90-2S.
| Feature (four-wire, one cabinet) | Xtreme X90-2S 4W | Eaton 93PM 100 kW 4W |
|---|---|---|
| Module ratings | 50 kW or 70 kW | 50 kW UPM only |
| Maximum capacity in this cabinet | 140 kW (2 × 70 kW) | 100 kW (2 × 50 kW), both slots occupied |
| Batteries | Internal — 4 to 20 hot-swappable modules | None internal; separate cabinet required |
| About 6 min at 100 kW | One cabinet, 23.6 in wide | Two cabinets, about 42 in wide |
| Maintenance bypass | Internal, standard | Optional accessory |
| Online efficiency | Up to 96.5% | Up to 97% |
| Start-up and warranty | Bundled start-up, 2 years on-site | Start-up included; 1 year on-site |
The slim 93PM chassis holds no internal batteries, so about six minutes at 100 kW means a second cabinet beside it and roughly double the installed width. It is also full at 100 kW; X90-2S modules come in 50 kW or 70 kW ratings, so on two 70s the same cabinet reaches 140 kW and a 100 kW system keeps 40 kW of headroom. Eaton rates online efficiency half a point higher. Specifications from publicly available manufacturer data; verify against current Eaton documentation for a specific quote. Full X90-2S vs 93PM comparison → · All X90-2S comparisons →
Where the X90-2S is deployed
Deploying in a healthcare or imaging facility? See X90-2S for medical imaging — or, for MRI specifics, UPS for MRI systems.
X90-2S — frequently asked questions
Three-wire or four-wire — which do I need?
It depends on what is downstream, not on the UPS. If every load is three-phase, or line-to-neutral loads are already served by a separate distribution path, the 3W + G version is simpler and less expensive to install. If the facility feeds 277 VAC line-to-neutral branch circuits — lighting, single-phase mechanical, mixed commercial — the 4W + G version carries the neutral through the UPS and removes a downstream step-down transformer from the design. Cabinet, modules, runtimes, breakers and service access are identical.
Can the four-wire version handle unbalanced single-phase loads?
Yes, to 100%. The 4W + G topology carries fully unbalanced single-phase load across phases, so branch circuits do not have to be balanced by design or rebalanced as the facility changes. That is the practical reason to specify it over a downstream transformer, which would impose its own balancing constraints.
How much runtime do the internal batteries give?
Up to 20 modules fit inside the UPS cabinet, giving about 27 minutes at 30 kW, 15 at 50 kW, 10 at 70 kW or 6 at 100 kW. Above 100 kW the internal batteries do not carry meaningful runtime, so a 140 kW configuration needs the X90-BC cabinet. Runtimes are identical for the three-wire and four-wire versions.
What does the X90-BC add, and what does it weigh?
It adds up to 36 more battery modules for 56 in total, taking a 50 kW load to about 52 minutes or a 140 kW load to 15. Plan the floor loading: the cabinet is 576 lb empty and each battery module adds 70 lb, so a fully populated X90-BC is close to 3,100 lb. It shares the UPS cabinet’s 23.6 × 42 × 79 in footprint.
How does redundancy work on this platform?
N+1 is configured within installed slot capacity, not implied at the frame maximum. A 100 kW system built from two 50 kW modules has no spare module; the same frame carrying a 50 kW load with both modules installed does. Power and battery modules are hot-swappable, so a module can be replaced without transferring the load.
When should I choose the X90-1S or the X90-5S instead?
By capacity and by cabinet height. The X90-1S covers 50–70 kW in a 58-inch cabinet, which is 21 inches shorter than this one and the reason it suits containers and low-ceilinged rooms. The X90-5S starts where this platform ends and scales to 350 kW. Choose the X90-2S when the site needs capacity growth beyond 70 kW in one integrated cabinet.
X90 platforms & related guides
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