E91 Three-Phase UPS – Expanded Capacity Facility UPS (30–40kVA, 208/120V)
30–40 kVA | 208/120V Three-Phase | Online Double-Conversion UPS
Compact centralized three-phase UPS engineered for facility infrastructure requiring higher capacity, predictable maintenance, and efficient electrical room deployment.
30–40 kW · 208Y/120 VAC Three-Phase · Online Double-Conversion · Start-Up and On-Site Service Included · TAA
E91 30–40 kW higher-capacity three-phase facility UPS
The E91 30–40 kW is the expanded-capacity member of the compact centralized three-phase online double-conversion family (208Y/120V) — built for healthcare, industrial, commercial, telecommunications, and distributed IT environments that need higher centralized capacity without transitioning to modular UPS architecture. It integrates UPS electronics and VRLA batteries in a single cabinet, delivers unity output power factor for up to 25% more usable load, and installs against the wall with no rear service clearance required. Up to 94% online (98% ECO) efficiency, a 4.3-in touch LCD, frequency-converter operation, and TAA compliance. An extended-runtime 30 kW variant (E91-30K4) is available. Factory start-up and 2 years of on-site service are included in the USA and Canada.*
*Factory start-up and 2 years on-site service: USA and Canada, within 100 miles of an XPC service center. Travel charges apply beyond 100 miles. Call (800) 582-4524 to confirm coverage for your site.
Higher centralized capacity, same compact architecture
The E91 30–40 kW is the higher-capacity compact centralized three-phase UPS for localized facility infrastructure. It provides reliable double-conversion power for edge facilities, small data centers, network closets, and industrial applications — integrating UPS and battery within a single cabinet so higher capacity can be deployed without the complexity, footprint, and cost of a modular system. It is selected where infrastructure planners need more centralized capacity while keeping predictable deployment and service models.
Single cabinet, against the wall, front-serviced
The platform integrates UPS electronics and VRLA batteries within one cabinet and is engineered to save floor space: the 30 and 40 kW models install against the wall with no rear service clearance required. Cable entry is from the top or bottom at the rear, while terminations are made at the front for accessible service. Optional external battery cabinets expand runtime without introducing modular system complexity.
| Design goal | How the E91 30–40 kW delivers it |
|---|---|
| Floor-space efficiency | Installs against the wall — no rear service clearance required |
| Accessible service | Front terminations; rear top/bottom cable entry |
| Higher centralized capacity | 30 / 40 kW in one integrated cabinet, no modular expansion needed |
| Runtime flexibility | Optional EBP10-5 external battery cabinets extend runtime |
What the E91 30–40 kW delivers
Unity PF (kVA = kW) provides more real capacity for high-density loads — up to 25% more critical load than typical UPS platforms at the same kVA rating.
The 30 and 40 kW cabinets install against the wall with no rear clearance required, saving valuable electrical-room floor space.
A color touch display provides an interactive power one-line, status, and alarms for at-a-glance facility monitoring.
High-efficiency operation in double-conversion mode, with up to 98% in ECO mode, plus frequency-converter operation to lock output at 50 or 60 Hz.
Separate rectifier and bypass inputs (jumpers pre-installed) support dual- or single-feed electrical designs, with a front maintenance bypass switch for service.
Internal high-rate VRLA batteries with an extended-runtime 30 kW variant (30K4), plus optional EBP10-5 external battery cabinets for longer runtimes.
Every E91 sold in the USA and Canada includes factory start-up and 2 years of on-site warranty service within 100 miles of an XPC service center. Sites beyond 100 miles are covered with a travel charge. Call (800) 582-4524 to confirm coverage for your site.
The expanded-capacity tier of the Xtreme Power family
The E91 30–40 kW is the higher-capacity fixed VRLA option in the 208/120V three-phase range. Step down to the E91 10–20 kW for smaller rooms, choose the Li90 for lithium, or the M90C-6S and M90U where growth or N+1 redundancy is required.
Centralized VRLA vs modular and lithium
Modular UPS systems provide scalability and redundancy but add complexity, footprint, and cost. Lithium platforms prioritize reduced maintenance, longer battery life, and higher energy density at a higher upfront cost. The E91 30–40 kW delivers a centralized VRLA architecture for applications where capacity requirements are defined and stable, eliminating modular expansion while simplifying installation and maintenance planning.
| Consideration | E91 30–40 kW (VRLA) | Modular (M90U) | Lithium (Li90) |
|---|---|---|---|
| Architecture | Centralized, defined capacity | Scalable, redundant modules | Integrated lithium |
| Footprint | Single cabinet, installs against the wall | Larger, scalable | Reduced footprint |
| Battery model | VRLA, periodic replacement | VRLA / modular | Lithium, long life, low maintenance |
| Best when | Capacity is defined; simple, predictable service | Growth or redundancy is required | Low-maintenance modernization is the goal |
Comparing battery chemistries? See lithium UPS vs lead-acid UPS.
Three models, 30–40 kW
| Model | Capacity (kW) | Weight | Internal battery | Runtime profile |
|---|---|---|---|---|
| E91-30K | 30 | 496 lbs | (60) × 12V 580W | Standard runtime |
| E91-30K4 | 30 | 549 lbs | (80) × 12V 580W | Extended runtime |
| E91-40K | 40 | 551 lbs | (80) × 12V 580W | Standard runtime |
All models share a single 23.6 × 36.3 × 65.6 in cabinet with unity power factor, online double-conversion topology, a 4.3-in touch LCD, and a 16 A adjustable charger. The E91-30K4 is an extended-runtime 30 kW variant with additional internal batteries. Optional EBP10-5 external battery cabinets ((100) × 12V 580W, 11.9 × 34 × 40.2 in) extend runtime; external maintenance bypass and output distribution are also available.
Runtime by battery configuration and load
Estimated runtime in minutes at 50% and 100% load — from internal batteries through one or two EBP10-5 external battery cabinets.
| Model | UPS internal batteries | UPS + EBP10-5 | UPS + (2) EBP10-5 | |||
|---|---|---|---|---|---|---|
| Percentage load: | 50% | 100% | 50% | 100% | 50% | 100% |
| E91-30K | 16 | 6 | 52 | 23 | 94 | 41 |
| E91-30K4 | 23 | 9 | 60 | 26 | 102 | 44 |
| E91-40K | 16 | 6 | 42 | 18 | 73 | 31 |
Runtimes are shown in minutes and vary with battery age and site conditions. The E91-30K4 carries additional internal batteries for extended runtime at 30 kW. Contact Xtreme Power at (800) 582-4524 or sales@xpcc.com for runtime sizing, or use the UPS sizing tool.
Where the E91 30–40 kW is deployed
The E91 30–40 kW is deployed across facilities requiring higher-capacity centralized UPS protection — healthcare imaging suites and multi-room clinical environments, industrial production and automation systems, commercial facility electrical infrastructure, telecommunications aggregation nodes, and distributed IT or micro data center environments. A 30 kW system suits larger imaging or industrial electrical rooms, while 40 kW supports broader commercial infrastructure and higher-density centralized loads, with runtime extended via external battery cabinets.
TAA-compliant facility power
The E91 is TAA compliant, supporting regulated healthcare, government, and commercial deployments requiring Trade Agreements Act compliance — alongside UL, cUL and FCC approvals.
E91 30–40 kW specifications
| Models | E91-30K / -30K4 / -40K, 30 / 30 / 40 kW at unity power factor; 30K4 is the extended-runtime 30 kW model |
| Topology | Online double-conversion, three-phase; centralized single cabinet |
| Input | 208Y/120 VAC or 220Y/127 VAC three-phase, 4W + G, +20 / −15%; 46–54 Hz or 56–64 Hz; separate rectifier & bypass inputs (dual or single, jumpers pre-installed) |
| Output | 208/120 VAC or 220/127 VAC; 50/60 Hz ±0.1%; unity power factor; frequency-converter capable |
| Efficiency | Up to 94% online (double conversion), up to 98% ECO mode |
| Overload | 150% for 1 minute; 125% for 10 minutes; 110% for 60 minutes |
| Inverter switching | 19.2 kHz |
| Internal battery | Sealed maintenance-free lead acid (VRLA), 12V 580W high-rate; (60) for 30K, (80) for 30K4 and 40K; max charging 16 A adjustable |
| External battery | EBP10-5 ((100) × 12V 580W, 770 lbs, 11.9 × 34 × 40.2 in) |
| Installation | Against-the-wall (no rear service clearance); front terminations; top/bottom cable entry from rear |
| Display | 4.3-in color touch LCD — interactive power one-line, status, and alarms |
| Dimensions / weight | 23.6 × 36.3 × 65.6 in (all models); 496 / 549 / 551 lbs (30K / 30K4 / 40K) |
| Communications | RS-232, EPO, USB; intelligent slot for optional Web/SNMP and Relay/dry contact cards |
| Environment | 32–104°F (0–40°C); altitude 5,200 ft (derates above 40°C and 5,200 ft) |
| Approvals | UL, cUL, FCC, TAA compliant |
| Warranty | 2 years electronics and battery (USA and Canada); 1 year outside the USA and Canada. Factory start-up and 2 years on-site service included within 100 miles of an XPC service center; travel charges apply beyond 100 miles. |
| Included | User manual, RS-232 cable, USB cable |
| Options | External maintenance bypass, output distribution, external battery cabinets |
E91 30–40 kW: common questions
What is the E91 30-40 kW?
A three-phase online double-conversion UPS, 30 or 40 kW at 208Y/120 V, with internal VRLA batteries in a single cabinet that installs against the wall with no rear service clearance. The E91-30K4 is a 30 kW model with more internal batteries for longer runtime.
What service is included?
In the USA and Canada, every E91 includes factory start-up and 2 years of on-site warranty service within 100 miles of an XPC service center. Sites beyond 100 miles are covered with a travel charge. Call (800) 582-4524 to confirm coverage for your site.
What is the warranty?
2 years on electronics and battery in the USA and Canada, and 1 year outside the USA and Canada.
Does it need rear service clearance?
No. Terminations are at the front and cables enter from the top or bottom at the rear, so the cabinet can stand against a wall.
What voltages does it support?
208Y/120 VAC or 220Y/127 VAC three-phase, 4W + G, +20/-15%, with separate rectifier and bypass inputs for dual- or single-feed designs. Input jumpers are pre-installed for single feed.
How is runtime extended?
With one or two EBP10-5 external cabinets, each holding 100 batteries. An E91-40K at full load runs 6 minutes on internal batteries and 31 minutes with two EBP10-5 cabinets.
When should I choose a modular UPS instead?
When the load will grow or N+1 redundancy is required. The E91 is fixed capacity. For modular growth at 208/120 V, see the M90C-6S or M90U; for smaller fixed capacity, the E91 10-20 kW.
Documents and related links
Plan your E91 30–40 kW deployment
Talk to an Xtreme Power specialist about service coverage for your site, capacity selection, extended-runtime (30K4) and external battery sizing, dual-feed electrical design, against-the-wall installation, and higher-capacity centralized three-phase deployment for healthcare, industrial, telecom, and distributed IT environments.