T91 Online UPS – Long-Runtime Tower UPS (700–3000 VA, 120V)
700 – 3000VA | 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.
700–3000 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 many hours, sized to load and continuity requirements. Light-load installations have reached 12 hours.
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.
A T91 with stacked external battery packs providing long-runtime backup for medical refrigeration in a pharmacy — the kind of extended-outage continuity the platform is built for.You are here
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.
T91-2000 vs the Eaton 9SX2000
The 9SX is the long-runtime online tower the T91 most directly replaces, and 2 kVA is where most of these installs land. The 700–3000 VA matchups follow the same pattern, with full breakdowns in the comparison hub.
| Feature (2 kVA) | Xtreme T91-2000 | Eaton 9SX2000 |
|---|---|---|
| Real power | 1930 W | 1800 W (0.9 PF) |
| Online efficiency | 92% | 89.4% at max load |
| Charger | Selectable 2–8 A | Fixed |
| Battery expansion | Up to 7 packs (about 217 min at full load) | Up to 4 EBMs |
| Battery pack weight | 82 lb (T91-BP72A) | 110 lb (9SXEBM96) |
| UPS weight | 63 lb | 77.2 lb |
| TAA compliant | Yes | No |
The T91-2000 delivers 130 W more usable power from the same 2 kVA, runs about 2.6 points more efficiently, and expands to seven battery packs against four. The packs themselves are 28 lb lighter each, which matters when seven of them are going onto a floor. TAA compliance is standard here and unavailable there. The T91 is also cross-shopped against APC Smart-UPS SRT and Vertiv GXT tower configurations. All T91 comparisons →
Six models, 700–3000 VA
| Model | Capacity (VA / W) | Dimensions (W×D×H) | Input cord | Output receptacles | Runtime expansion |
|---|---|---|---|---|---|
| T91-700 | 700 / 700 | 5.6 × 15.6 × 8.6 in | 5-15P | (6) NEMA 5-15R | Internal only |
| T91-1000 | 1000 / 1000 | 5.6 × 15.6 × 8.6 in | 5-15P | (6) NEMA 5-15R | Up to 7 packs |
| T91-1500 | 1500 / 1450 | 5.6 × 15.6 × 8.6 in | 5-15P | (6) NEMA 5-15R | Up to 7 packs |
| T91-2000 | 2000 / 1930 | 7.4 × 16.5 × 12.5 in | L5-20P | (1) L5-20R + (8) 5-20R | Up to 7 packs |
| T91-2000V2 | 2000 / 1930 | 7.4 × 16.5 × 12.5 in | 5-20P | (1) L5-20R + (8) 5-20R | Up to 7 packs |
| T91-3000 | 3000 / 2880 | 7.4 × 16.5 × 12.5 in | L5-30P | (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. The T91-2000 and T91-2000V2 are identical apart from the input cord: L5-20P on the 2000, 5-20P on the V2. Specify by the branch circuit and receptacle already at the site. 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 |
| Efficiency | Up to 98% in ECO mode; 92% online |
| 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 |
| Warranty | 3 years electronics and battery (USA and Canada); 1 year outside the USA and Canada |
| 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.
T91 — frequently asked questions
How many battery packs can I add, and how much runtime does that give?
Up to seven on every model except the T91-700, which is internal batteries only. The T91-2000 is the most commonly specified model for exactly this reason. It runs about 6 minutes internally at full load, 30 with one pack, 93 with three, and 217 with seven. At half load the same system goes from 18 minutes internally to about 500 with seven packs, so an eight-hour outage is reachable on a modest load. Packs are the T91-BP72A at 82 lb each; plan the floor space and the weight, not just the runtime.
How long does recharge take after a long outage?
That is what the programmable charger is for. The T91 charger is selectable from 2 to 8 A, against roughly 1.4 A fixed on the Eaton 9SX it most often replaces. On a large battery string that difference decides whether the system is ready for a second outage the same day. Set the charge current to suit the bank size; a bigger string needs the higher setting or recharge stretches out.
T91 or P91 — tower or rack?
Runtime against density. Both are 120 V online double-conversion with the same protection. The T91 is a floor-standing tower built to carry larger battery strings and a higher-capacity charger, so it goes further on runtime. The P91 gives the same conditioning in a rack chassis where rack units are the constraint. If the requirement is multi-hour continuity, the tower is the answer; if it is fitting into an existing rack, the P91 is.
What does unity power factor mean for sizing?
It changes the usable watts. The T91-700 and T91-1000 are rated at unity, so 1000 VA delivers 1000 W. The larger models run up to about 0.96, so the T91-3000 delivers 2880 W. A competing 1500 VA system at 0.9 delivers 1350 W against 1450 W here. Size on watts, or two systems look equivalent on paper when they are not.
Which model fits my load?
Capacity first, then the receptacles. The 700 through 1500 share a compact 5.6-inch tower with six NEMA 5-15R outlets. The 2000 and 3000 move to a 7.4-inch chassis with a twist-lock plus eight 5-20R. Input cords differ too: 5-15P on the 700 and 1000, 5-20P or L5-20P on the 2000, L5-30P on the 3000. Check the receptacle and the branch circuit before settling on a capacity.
Is the T91 TAA compliant?
Yes, and it is listed UL and cUL. That matters on public-sector work, where the Eaton 9SX it commonly replaces is not TAA compliant. Warranty is 3 years electronics and battery in the USA and Canada, 1 year outside.
Where is the T91 usually deployed?
Wherever an outage lasts longer than a rack UPS is sized for. Medical and food refrigeration, retail and restaurant point of sale, hospitality property management, network closets that need to ride through until a generator starts, and government sites. The common thread is that the load is modest but the outage is long, which is the opposite of the usual rack UPS case.
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.
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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″
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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”
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