T91 Online UPS – Long-Runtime Tower UPS (1000–3000 VA, 120V)
1000–3000 VA | 120V | Online Double Conversion
Long-runtime tower UPS engineered for commercial, retail, healthcare, and distributed infrastructure requiring multi-hour backup power and continuous conditioned output.
1000–3000 VA · 120 VAC · Online Double-Conversion Tower UPS · Long Runtime
T91 long-runtime online tower UPS
The T91 is a 120 V online double-conversion tower UPS — 700–3000 VA — built for applications where extended runtime is the primary requirement — beyond the limits of compact rack UPS. External battery expansion and a high-capacity programmable charger support runtime from short ride-through to multi-hour continuity, while online topology delivers continuous conditioned power with zero transfer time. For 208–240 V, see the T91i.
Long-runtime power architecture
The T91 is designed for environments where outages extend beyond typical UPS runtime expectations. Unlike rack UPS optimized for short-duration protection, the T91 uses external battery systems and programmable charging to support multi-hour runtime — keeping infrastructure operational during extended outages or until backup generation is available. Online double-conversion topology ensures continuous conditioned power, isolating connected equipment from voltage fluctuations and electrical disturbances.
What the T91 delivers
Zero transfer time and continuous conditioning, isolating equipment from voltage fluctuations and electrical disturbances.
External battery systems scale runtime from minutes to multiple hours, sized to load and continuity requirements.
High usable real power — 700 W at 700 VA and 1000 W at 1000 VA (unity), up to 2880 W at 3000 VA — without oversizing.
A high-capacity selectable charger supports larger battery banks and reduces recharge time after extended outages.
A tower chassis supports larger battery systems for equipment-adjacent and floor-mounted installations.
Optional SNMP / web network management enables remote monitoring across distributed sites.
The long-runtime tower tier
The T91 operates as the long-runtime tower UPS platform within distributed infrastructure — typically deployed in floor-mounted or equipment-adjacent installations, in retail, hospitality, and medical environments, and wherever runtime requirements exceed rack UPS capabilities.
Choose the T91 for long-runtime online protection in a tower — where extended battery strings and multi-hour runtime matter more than rack density; choose the P91 for the same online protection in a rack chassis, or the T91i for 208–240 V deployments.
Tower runtime or rack density?
Rack UPS systems are typically optimized for density and short-duration runtime. The T91 is designed for applications where runtime is the primary requirement — its tower form factor supports larger battery systems and higher charging capacity, enabling significantly longer backup durations. For rack-based runtime, the P91 provides scalable runtime in a rack chassis.
208–240V deployments
For installations requiring 208–240 V output, the T91i provides the same long-runtime online tower architecture at higher voltage.
Replace legacy long-runtime UPS
The T91 is commonly deployed as a replacement for tower-based and extended-runtime UPS platforms — APC Smart-UPS SRT tower configurations with external packs, Eaton 9PX / 9SX extended-runtime systems, and Vertiv Liebert GXT tower deployments — providing a simplified long-runtime architecture with programmable charging and scalable battery expansion for consistent deployment across sites.
T91-1500 vs the Eaton 9SX at 1.5 kVA
The 9SX is the long-runtime online tower the T91 most directly replaces. Here they are at 1.5 kVA, from the per-model comparison; the 700–3000 VA matchups follow the same pattern, with full breakdowns in the comparison hub.
| Feature (1.5 kVA) | Xtreme T91-1500 | Eaton 9SX1500 |
|---|---|---|
| Real power | 1450 W | 1350 W |
| Charger | Selectable 2–8 A | Fixed about 1.4 A |
| Battery expansion | Up to 7 packs (about 133 min) | Up to 4 packs (about 105 min) |
| Weight | 34.3 lb | 41.9 lb |
| TAA compliant | Yes | No |
The T91-1500 leads on usable watts, a far faster selectable charger, deeper runtime expansion (7 packs vs 4), lighter weight, and standard TAA compliance; warranty is matched at 3 years. The T91 is also cross-shopped against APC Smart-UPS SRT and Vertiv GXT tower configurations. All T91 comparisons →
Five models, 700–3000 VA
| Model | Capacity (VA / W) | Dimensions (W×D×H) | Output receptacles | Runtime expansion |
|---|---|---|---|---|
| T91-700 | 700 / 700 | 5.6 × 15.6 × 8.6 in | (6) NEMA 5-15R | Internal only |
| T91-1000 | 1000 / 1000 | 5.6 × 15.6 × 8.6 in | (6) NEMA 5-15R | Up to 7 packs |
| T91-1500 | 1500 / 1450 | 5.6 × 15.6 × 8.6 in | (6) NEMA 5-15R | Up to 7 packs |
| T91-2000 | 2000 / 1930 | 7.4 × 16.5 × 12.5 in | (1) L5-20R + (8) 5-20R | Up to 7 packs |
| T91-3000 | 3000 / 2880 | 7.4 × 16.5 × 12.5 in | (1) L5-30R + (8) 5-20R | Up to 7 packs |
Models 700–1500 share a compact 5.6 in-wide tower; 2000–3000 use a 7.4 in-wide chassis. Input cords: 5-15P (700/1000), 5-20P or L5-20P (2000 V2), L5-30P (3000). The T91-700 uses internal batteries only; all larger models scale to seven external packs. Detailed weights, runtime tables, and recharge times are published in the T91 datasheet.
Scalable runtime with external battery systems
Internal batteries provide ride-through; matching external battery packs scale runtime into multiple hours. Each model shows runtime in minutes at 100% and 50% load, from internal-only out to seven packs.
| Load | Internal | +1 | +2 | +3 | +4 | +5 | +6 | +7 |
|---|---|---|---|---|---|---|---|---|
| T91-700 · 700 VA · internal only | ||||||||
| 100% load | 5.6 | — | — | — | — | — | — | — |
| 50% load | 16 | — | — | — | — | — | — | — |
| T91-1000 · 1000 VA · up to 7 packs | ||||||||
| 100% load | 6 | 29 | 57 | 89 | 117 | 143 | 175 | 208 |
| 50% load | 17 | 74 | 129 | 192 | 259 | 330 | 419 | 485 |
| T91-1500 · 1500 VA · up to 7 packs | ||||||||
| 100% load | 3 | 18 | 35 | 54 | 77 | 97 | 117 | 133 |
| 50% load | 10 | 44 | 88 | 125 | 165 | 211 | 258 | 306 |
| T91-2000 (V2) · 2000 VA · up to 7 packs | ||||||||
| 100% load | 6.4 | 30 | 59 | 93 | 121 | 149 | 183 | 217 |
| 50% load | 18 | 77 | 133 | 200 | 270 | 350 | 437 | 500 |
| T91-3000 · 3000 VA · up to 7 packs | ||||||||
| 100% load | 3 | 18 | 35 | 54 | 78 | 97 | 118 | 134 |
| 50% load | 10 | 45 | 89 | 126 | 167 | 212 | 260 | 309 |
Estimated minutes; values vary with battery age, temperature, and load profile. The T91-700 uses internal batteries only; T91-1000 through -3000 scale to seven external packs. The 2000 VA figures are for the V2 chassis. For 208–240 V runtimes, see the T91i →
Built for extended-outage continuity
The T91 is deployed across commercial and regulated environments — retail and restaurant operations, hospitality, medical refrigeration, network infrastructure, and government installations — particularly where extended runtime is required to maintain operations during prolonged outages.
Continuity for POS, controls, and refrigeration during outages.
Multi-hour runtime protecting temperature-sensitive loads.
Conditioned backup for property management and AV.
Extended ride-through for switching and routing.
TAA-compliant long-runtime power for public-sector sites.
Consistent long-runtime UPS across multiple locations.
Capacity guidance: 700–1000 VA for small systems and POS; 1500–2000 VA for retail, network, and control systems; 3000 VA for higher-load commercial infrastructure.
T91 specifications
| Specification | Detail |
|---|---|
| Topology | Online double-conversion |
| Capacity | 700 / 1000 / 1500 / 2000 / 3000 VA (700–2880 W) |
| Voltage | 120 VAC single-phase |
| Output power factor | High; unity (1.0) on 700 / 1000, up to about 0.96 on larger models |
| Battery | Internal; external expansion up to 7 packs (1000–3000; T91-700 internal only) |
| Charger | Programmable / selectable 2–8 A |
| Runtime | Scalable, up to multi-hour |
| Form factor | Floor-standing tower |
| Monitoring | Optional SNMP / web network management |
| Compliance | UL, cUL, RoHS, TAA compliant |
| Higher-voltage option | T91i (208–240 V) |
Specifications from the T91 product overview; dimensions, weights, runtime tables, and recharge times are detailed in the T91 datasheet.
Documents and related links
Plan with confidence
Xtreme Power supports engineers and infrastructure planners in designing long-runtime UPS systems for commercial continuity, extended-outage protection, and distributed deployment.
| MODEL NUMBER | T91-700 | T91-1000 | T91-1500 | T91-2000 | T91-2000V2 | T91-3000 | |
| CAPACITY | Power rating | 700VA (700W) | 1000VA (1000W) | 1500VA (1450W) | 2000VA (1930W) | 2000VA (1930W) | 3000VA (2880W) |
| INPUT | Voltage | 120VAC nominal (55-150VAC)* | |||||
| Frequency | 50/60Hz auto-sensing | ||||||
| Power factor | >0.99 at full load | ||||||
| OUTPUT | Voltage | 120VAC nominal (100/110/115/127 selectable)** | |||||
| Waveform | Pure sine wave, zero transfer time | ||||||
| Frequency | 50/60Hz auto-sensing ≤ 1% | ||||||
| Efficiency | Up to 98% ECO Mode and 92% online mode | ||||||
| Overload capacity | > 110% & ≤ 130% for 5 min; > 130% & ≤140% for 30 sec; >140% for 1.5 sec | ||||||
| BATTERY | Battery type | (2) 12V 9AH | (3) 12V 9AH | (3) 12V 9AH | (6) 12V 9AH | (6) 12V 9AH | |
| Recharge | 3 hours to 95% for internal battery with 2A charge current | ||||||
| Battery charger | 2A (default) to 8A, programmable from LCD display | ||||||
| PHYSICAL | UPS dimensions | 5.6″ x 15.6″ x 8.6″ (W x D x H) | 7.4″ x 16.5″ x 12.5″ (W x D x H) | ||||
| UPS weight | 26 lbs | 30 Ibs | 34.3 lbs | 63 lbs | 66 lbs | ||
| Line cord | 6 ft, 5–15P | 6 ft, L5–20P | 6 ft, 5-20P | 6 ft, L5–30P | |||
| Receptacles | (6) 5–15R | (1) L5-20R+(8) 5-20R | (1) L5-30R+(8) 5-20R | ||||
| OPTIONAL | Model number | N/A | T91-BP36A | T91-BP72A | |||
| BATTERY PACKS | Dimensions | N/A | 5.6″ W x 15.6″ D x 8.6″ H | 7.4″ W x 16.5″ D x 12.5″ H | |||
| Weight | N/A | 44 Ibs | 82 Ibs | ||||
| ENVIRONMENT | Temperature | 32–104°F (0–40°C) | |||||
| Audible noise | < 50 dBA | ||||||
| Altitude | 11,500 ft above sea level | ||||||
| APPROVALS | UL1778 (cTUVus), FCC B, RoHS, TAA | ||||||
| WARRANTY | 3 years electronics, 3 years battery warranty (USA and Canada) | ||||||
| COMMUNICATIONS INTERFACE | RS-232, USB, EPO, intelligent slot for optional cards (Web/SNMP, Relay/dry contact, Modbus) | ||||||
| INCLUDED IN BOX | ViewPower monitoring software CD, USB cable, user manual | ||||||
| AVAILABLE OPTIONS | Extended warranty, bypass distribution (XBDM), power distribution (XPDU) | ||||||
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Mounting Kits
[table colwidth=”75″]
,Model,Description,Unit Weight, Unit Dimensions
,T90-WMB,”Wall Mount Bracket for use with T91-700, T91-1000, T91-1500, T90-2000, T91i-2000; Rated for 40 lbs”,5 lbs,4.0”-8.0” x 7.0” x 8.0”
[/table] -
Connectivity
[table colwidth=”75″]
,Model,Description,Unit Weight, Unit Dimensions
,SNMP-2PV3,”Two Port Internal SNMP Card”, 1 lb,7.25″ x 6″ x 2.5″
,SNMP-EMPV2,”Environmental Monitoring Sensor”, 1 lb,7.25″ x 6″ x 2.5″[/table]
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Bypass Distribution Modules
[table colwidth=”75″]
,Model,Description,Utility Input, Output Connections, UPS Connections, Unit Weight, Unit Dimensions
,XBDM1020HV1,Bypass 16A capacity for use with T90i-1500 (includes IEC C20 C19 cord kit),”IEC C20 inlet”,”(2) IEC C19 + (4) IEC C13 front, (4) IEC C13 back”,IEC C20,3.5 lbs,19.3″ x 3.5″ x 1.75″
[/table] -
Power Distribution Units & Transformers
[table colwidth=”75″]
,Model,Description,Input Power Cord, Outlets, Unit Weight, Unit Dimensions
,XPDU-IEC,230V Basic Power Distribution Unit for use with T90i-1500,IEC C20 inlet,(10) IEC C13 + (2) IEC C19,2.6 lbs,19.0″ x 3.5″ x 1.75″
,XPD-AT15A,1500W Transformer PDU with Meter 208V to 120V for use with T90i-1500,”Detachable IEC C14, 3ft”,(16) 5–15R,19.7 lbs,19.0” x 10.5” x 3.5”
,XAT-400,400VA Step Down Transformer 208V to 120V for use with T90i-1500,”208V IEC C14, 2ft”,”120V 5–15R, 2ft”,8.0 lbs,7.0” x 6.8” x 5.9”
[/table]
