1000–3000 VA | 120V | Online Double-Conversion UPS
Runtime-flexible online UPS engineered for distributed IT, AV, retail, and multi-site infrastructure requiring continuous power conditioning and scalable runtime.
The P91 is a 120 V online double-conversion UPS built around a flexible VRLA battery architecture: internal batteries provide standard ride-through, while external battery packs extend runtime to match the application. Online topology continuously conditions incoming power with zero transfer time, and near-unity power factor (2U units) delivers maximum usable watts — all in a compact 2U rack/tower form factor (plus a 1U model). It is TAA compliant(made in Taiwan; UL / cUL listed) for federal, education, and public-sector procurement.
Product Snapshot
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Online double-conversion
Zero transfer time and continuous conditioning – pure sine output at ≤2% THD (linear) / ≤4% THD (non-linear) on 2U units.
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Scalable external batteries
Add up to seven matching packs (BP36 / BP48 / BP72) to take a rack from a few minutes of ride-through to over two hours — enough to outlast most outages or bridge to a generator — then recharge to 95% in under 3 hours.
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Near-unity power factor
2U units deliver near-unity output power factor — up to 1450 W from a 1500 VA frame, more usable watts than the 1350 W typical of competing online units.
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Powerful 8 A charger
An adjustable charger (up to 8 A) quickly recharges internal batteries and up to seven external packs; recharge to 95% in under 3 hours.
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Maintenance bypass + auto-restart
An optional XBDM bypass lets you service or swap the UPS without dropping the rack; after a full discharge, auto-restart brings the load back the moment utility returns — no truck roll to power-cycle.
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Efficient + monitored
Up to 98% ECO-mode efficiency, with optional Web/SNMP, Modbus, and relay/dry-contact monitoring cards.
FEATURES
The P91 operates as the standard online UPS platform within distributed power architecture, providing conditioned power and scalable runtime at the rack or edge level. It is typically deployed in network closets, IDF/MDF environments, and multi-site infrastructure where runtime requirements vary but platform standardization is required.MODEL SELECTION GUIDE
| MODEL | CAPACITY | FORM FACTOR | RECEPTACLES | DIMENSIONS (W×D×H) | WEIGHT | INTERNAL BATTERY |
|---|---|---|---|---|---|---|
| P91c-1000 | 1000 VA / 800 W | 1U | (3) NEMA 5-15R | 17.2 × 17.8 × 1.7 in | 28 lb | (4) 6V 290W |
| P91-1000 | 1000 VA / 1000 W | 2U | (8) NEMA 5-15R | 17.2 × 15.1 × 3.5 in | 25.5 lb | (2) 12V 9Ah |
| P91-1500 | 1500 VA / 1450 W | 2U | (8) NEMA 5-15R | 17.2 × 15.1 × 3.5 in | 34.2 lb | (3) 12V 9Ah |
| P91-2000 | 2000 VA / 1930 W | 2U | (8) NEMA 5-15/20R | 17.2 × 19.0 × 3.5 in | 43 lb | (4) 12V 9Ah |
| P91-3000 | 3000 VA / 2880 W | 2U | (1) L5-30R + (6) 5-15/20R | 17.2 × 23.8 × 3.5 in | 60.6 lb | (6) 12V 9Ah |
2U units offer near-unity power factor and selectable output (100/110/115/120/127 VAC). Rack depth is measured front bracket to unit panel; add 1 in for the front bezel. The P91c-1000 is a 1U model with internal batteries only.
P91 specifications
| SPECIFICATION | DETAIL |
|---|---|
| Topology | Online double-conversion |
| Capacity | 1000 / 1000 / 1500 / 2000 / 3000 VA (800–2880 W) |
| Output power factor | Near-unity (up to 1.0 on 2U units) |
| Input | 55–150 VAC (load dependent), 50/60 Hz auto-sensing |
| Output voltage | 120 VAC nominal; 100 / 110 / 115 / 127 VAC selectable (2U) |
| Output waveform | Pure sine wave; 2U ≤2% / ≤4% THD, 1U ≤3% / ≤5% THD (linear / non-linear) |
| Output frequency | 50/60 Hz (±0.1 Hz on 2U, ±0.3 Hz on 1U) |
| Efficiency | Up to 98% (ECO mode) / 94% (online mode) |
| Battery | Sealed, maintenance-free VRLA (lead-acid); internal + external pack expansion |
| External battery packs | BP36 / BP36E / BP48 / BP72; up to 7 packs (1500 / 2000 / 3000) |
| Recharge | <3 h to 95% (2U, 2 A); <9 h to 90% (1U) |
| Charger current | Up to 8 A adjustable (2U); 1 A (1U) |
| Form factor | 2U rack / tower (P91c-1000 is 1U) |
| Operating temperature | 32–104°F (0–40°C) |
| Altitude | Up to 6,500 ft |
| Communications | RS-232 (2U), USB, EPO; intelligent slot (Web/SNMP, relay/dry contact, Modbus) |
| Approvals | UL, cUL, RoHS, FCC Class A/B; TAA compliant |
| Load protection policy | $50,000 connected-equipment protection |
| Warranty | 3-year electronics & battery (USA & Canada); optional 5-year |
| Included | ViewPower software, front brackets, tower pedestals, user manual |
| Options | Bypass distribution (XBDM), power distribution (XPDU), matching battery packs, 4-post rail kit, 2-post shelf kit, wall-mount bracket (2U) |
Specifications from the P91 1-3kVA datasheet (Rev 4/6/20). Capacities are based on the highest selectable voltage; some models derate at lower voltages. For 230 V online models, reference the P91g.
| MODEL NUMBER | P91c-1000 | P91-1000 | P91-1500 | P91-2000 | P91-3000 | |
| CAPACITY | Power rating | 1000VA (800W) | 1000VA (1000W) | 1500VA (1450W) | 2000VA (1930W) | 3000VA (2880W) |
| INPUT | Voltage/frequency | 55–150VAC* / 50/60Hz auto-sensing | ||||
| OUTPUT | Voltage | 120VAC | 120VAC nominal (100/110/115/127 selectable)*** | |||
| Waveform | Pure sine wave, 1U: <=3% THD (linear load), <=5% THD (non-linear load); 2U: <=2% THD (linear load), <=4 THD (non-linear load) | |||||
| Frequency | 50/60Hz ± 0.3Hz | 50/60Hz ± 0.1Hz | ||||
| Efficiency | Up to 98% ECO mode or 94% online mode | |||||
| Overload capacity | 1U online mode: > 105% & ≤ 130% for 2 min; > 130% & ≤200% for 10 sec; >200% for 250 ms / 2U online mode: > 110% & ≤ 130% for 5 min; > 130% & ≤140% for 30 sec; >140% for 1.5 sec | |||||
| BATTERY | Battery chemistry | Sealed, maintenance-free lead acid | ||||
| Battery size | (4) 6V 290W | (2) 12V 9AH | (3) 12V 9AH | (4) 12V 9AH | (6) 12V 9AH | |
| Typical recharge / charger | < 9 hours to 90% | < 3 hours to 95% with 2A charger current | ||||
| Charging current | 1A | 2A default, max 8A adjustable | ||||
| PHYSICAL | Dimensions (W x D x H)** | 17.2 x 17.8 x 1.7 in | 17.2 x 15.1 x 3.5 in | 17.2 x 19 x 3.5 in | 17.2 x 23.8 x 3.5 in | |
| Weight | 28 lbs | 25.5 lbs | 34.2 lbs | 43 lbs | 60.6 lbs | |
| Line cord | C14 inlet, 5ft 5-15P to C13 line cord | 6 ft, 5–15P | 6 ft, 5–20P | 6 ft, L5–30P | ||
| Receptacles | (3) NEMA 5–15R | (8) NEMA 5-15R | (8) NEMA 5–15/20R | L5–30R + (6) 5–15/20R | ||
| ENVIRONMENT | Operating temperature | 32–104°F (0–40°C) | ||||
| Altitude | 11,500 ft above sea level | |||||
| APPROVALS | UL, cUL, RoHS, FCC Class B (1000 (2U), 1500VA), FCC Class A (1000 (1U), 2000, 3000VA), TAA compliant (UPS only) | |||||
| WARRANTY | 3 years electronics, 3 years battery warranty (USA and Canada) | |||||
| COMMUNICATIONS INTERFACE | RS-232(2U), USB, EPO, intelligent slot for optional cards (Web/SNMP, Relay/dry contact, Modbus) | |||||
| INCLUDED IN BOX | ViewPower software,front brackets, tower pedestals, user manual | |||||
| AVAILABLE OPTIONS | Bypass distribution (XBDM), power distribution (XPDU), 4-post rail kit, 2-post shelf kit, wall mount bracket (2U units) | |||||