P91g Li Lithium Rack UPS – Online Double-Conversion (1500–3000 VA, 208–240V)
1500–3000 VA | 208–240 V | Online Double Conversion
Lithium rack UPS with online double-conversion topology for distributed IT, network closet, AV, and edge infrastructure. LiFePO₄ batteries deliver long lifecycle performance and high-temperature operation up to 50 °C.
1500–3000 VA · 208–240 VAC · Online Double-Conversion Lithium Rack UPS
P91g Li lithium online rack UPS
The P91g Li is a 2U online double-conversion UPS built on lithium iron phosphate (LiFePO₄) batteries for 208–240 V / global rack infrastructure. Online topology delivers zero transfer time and full isolation from upstream disturbances, while LiFePO₄ chemistry adds long service life, reduced maintenance, and fast recharge. Rack, tower, or wall mountable with IEC outlets and TAA compliance, it is the higher-voltage counterpart to the 120 V P91 Li.
P91g Li 2U online double-conversion lithium UPS — front view with 230 V status LCD.
Rack-level power continuity for 208–240 V infrastructure
The P91g Li is deployed in distributed infrastructure where localized UPS protection is required at the rack level and where higher-voltage operation is standard. Online double-conversion topology provides zero transfer time and continuous conditioned power independent of upstream disturbances, while lithium architecture reduces battery replacement frequency, improves thermal tolerance versus VRLA, and lowers lifecycle service requirements.
What the P91g Li delivers
Zero transfer time and the cleanest output – pure sine wave at ≤2% THD (linear) / ≤4% THD (non-linear), 0.9 output power factor.
Up to 15-year battery life or 3,000–5,000 discharge cycles, eliminating routine battery replacement.
Rated for high-temperature environments up to 50 °C (122 °F), with derating above 40 °C.
The battery management system provides cell balancing, current sharing, and over-charge / over-discharge protection; the hot-swappable battery pack is replaced without dropping the load, and the optional XBDM bypass lets the UPS itself be serviced or swapped.
Six years on electronics and battery in the USA and Canada (2 years depot repair outside), plus a $50,000 connected-equipment load protection policy in the USA and Canada when installed at 208 or 240V.
Selectable 200–240 VAC output; up to 98% ECO / 94% online efficiency; recharge to 90% in about 1.5 hours.
The standard 208–240 V lithium rack platform
The P91g Li defines the standard 208–240 V lithium rack UPS tier within the Xtreme Power distributed infrastructure strategy. It is typically deployed in conventional rack layouts with external power distribution, sitting above the ultra-compact J60i and short-depth J60Ci, and below the high-density J90i.
P91g Li or J90i?
The P91g Li is the standard 2U platform for 208–240 V environments — built for internal-battery ride-through with conventional rack deployment and power distribution. The J90i delivers the same online lithium protection in a 1U chassis (half the rack height) and adds individual outlet control, plus external battery pack support on its 2kVA and 3kVA models for runtime well beyond what internal batteries alone provide. Choose the J90i when rack space is at a premium, outlet-level switching is required, or runtime must extend past the P91g Li’s internal-only configuration; choose the P91g Li when a standard 2U platform with internal runtime is the better fit.
Three models, 1500–3000 VA
| Model | Capacity | Receptacles | Inlet / cord | Dimensions (W×D×H) | Weight | Battery config |
|---|---|---|---|---|---|---|
| P91g-1.5kLi | 1500 VA / 1350 W | (8) IEC C13 | C14 inlet · L6-20P, 8 ft | 17.2 × 15.1 × 3.4 in | 25.6 lbs | 15S2P |
| P91g-2kLi | 2000 VA / 1800 W | (8) IEC C13 | C14 inlet · L6-20P, 8 ft | 17.2 × 19.0 × 3.4 in | 33.5 lbs | 15S2P ×2 |
| P91g-3kLi | 3000 VA / 2700 W | (1) IEC C19 + (8) C13 | C20 inlet · L6-20P, 8 ft | 17.2 × 23.8 × 3.4 in | 45.2 lbs | 24S1P ×3 |
All models are 2U (3.4 in) high and 17.2 in wide. Rack depth is measured front bracket to unit panel; add 1 in for the front bezel. Output voltage is selectable (200 / 208 / 220 / 230 / 240 VAC); derate capacity to 80% at 200 or 208 VAC.
Internal battery runtime by load
| Model | 100VA 90W |
150VA 135W |
200VA 180W |
300VA 270W |
400VA 360W |
600VA 540W |
800VA 720W |
1000VA 900W |
1200VA 1080W |
1400VA 1260W |
1500VA 1350W |
1600VA 1440W |
1800VA 1620W |
2000VA 1800W |
2333VA 2100W |
2666VA 2400W |
3000VA 2700W |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P91g-1.5kLi | — | 101 | 77 | 49 | 35 | 22 | 16 | 13 | 10 | 8 | 8 | — | — | — | — | — | — |
| P91g-2kLi | — | — | 148 | 98 | 72 | 47 | 34 | 27 | 22 | 19 | 18 | 16 | 14 | 13 | — | — | — |
| P91g-3kLi | — | — | — | 115 | 87 | 56 | 41 | 32 | 27 | 23 | 21 | 20 | 17 | 15 | 13 | 11 | 10 |
Approximate runtimes in minutes by absolute load — UPS load is shown in VA (top of each column) and watts (bottom, at 0.9 power factor). Each model is characterized from 10% to 100% of its rated load. Internal batteries only; actual runtime varies with battery age, temperature, and load profile. The P91g Li uses an internal battery architecture for ride-through and controlled shutdown — for extended runtime, the 1U J90i adds external battery packs on its 2k and 3k models. Size it with the UPS selector →
Built for global distributed infrastructure
The P91g Li is deployed across network closets, AV systems, telecommunications infrastructure, and distributed IT in 208–240 V environments — particularly IDF/MDF deployments and multi-site global infrastructure where a consistent, maintainable UPS platform is required.
Conditioned 230 V power for switching, routing, and edge network equipment.
A consistent lithium platform for IDF/MDF and structured cabling rooms.
Clean, zero-transfer power for AV racks and control systems.
Reliable ride-through for telecom and communications nodes.
Standardized rack protection across distributed and edge sites.
Predictable lifecycle for repeatable 208–240 V deployments worldwide.
Capacity guidance: 1500 VA for network closets and distributed infrastructure; 2000 VA for IT racks and AV systems; 3000 VA for higher-density distributed environments.
P91g Li specifications
| Specification | Detail |
|---|---|
| Topology | Online double-conversion |
| Capacity | 1500 / 2000 / 3000 VA (1350 / 1800 / 2700 W) |
| Output power factor | 0.9 |
| Input | 110–300 VAC (load dependent), 50/60 Hz auto-sensing |
| Output voltage | 200 / 208 / 220 / 230 / 240 VAC selectable (derate to 80% at 200 / 208 VAC) |
| Output waveform | Pure sine wave; ≤2% THD (linear), ≤4% THD (non-linear) |
| Output frequency | 50/60 Hz ± 0.1 Hz |
| Efficiency | Up to 98% (ECO mode) / 94% (online mode) |
| Overload (online) | 110–130% for 5 min; >130–140% for 30 s; >140% for 1.5 s |
| Battery | LiFePO₄ (LFP26650, 2600 mAh cells); hot-swappable internal pack; battery management system (BMS) |
| Battery life | Up to 15 years / 3,000–5,000 discharge cycles |
| Recharge | 1.5 h to 90%; charger 2/4/6/8 A, LCD-adjustable |
| Form factor | 2U; rack, tower, or wall mount |
| Operating temperature | 32–122°F (0–50°C), derating above 104°F (40°C) |
| Altitude | Up to 6,500 ft |
| Communications | RS-232, USB, EPO; intelligent slot (Web/SNMP, relay/dry contact, Modbus) |
| Approvals | CE, RoHS; battery packs UL1973, UN38.3; TAA compliant |
| Load protection policy | $50,000 connected-equipment protection (USA and Canada, installed at 208 or 240V); registration required within 10 days of purchase |
| Warranty | 6-year electronics / 6-year battery (USA and Canada); 2 years depot repair outside the USA and Canada |
| Included | ViewPower software, front brackets, tower pedestals, user manual |
| Options | Bypass distribution (XBDM), power distribution (XPDU), 4-post rail kit, 2-post shelf kit, wall-mount bracket |
A 2-year warranty applies where ambient temperature exceeds 40°C (104°F) and is below 50°C (122°F). Confirm configuration-specific details on the datasheet.
Power distribution and maintenance bypass
The P91g Li is typically deployed with rack-mounted power distribution and external maintenance-bypass compatibility. An optional XPDU power-distribution unit and XBDM bypass module support standardized rack power architecture and let the UPS be serviced or replaced without interrupting the critical load.
Lifecycle advantages over VRLA
Lithium UPS systems provide lifecycle advantages over VRLA, including longer service intervals, improved thermal tolerance, and reduced maintenance intervention. The P91g Li’s LiFePO₄ architecture delivers up to 15-year battery design life, 3 to 4 times that of lead-acid, with faster recharge.
P91g Li — frequently asked questions
What is the difference between the P91g Li and the P91 Li?
Input voltage. The P91 Li is the 120 V platform with NEMA outlets; the P91g Li is the 208-240 V version with IEC outlets. Same 2U form factor, same LiFePO4 chemistry, same online double-conversion topology. Choose on the supply at the rack, not on features.
Should I specify the P91g Li or the J90i?
Rack space and runtime strategy. The P91g Li is the standard 2U platform built around internal-battery ride-through in conventional rack layouts. The J90i delivers the same online lithium protection in 1U, adds individual outlet switching, and supports external battery packs on its 2 kVA and 3 kVA models. Choose the J90i when rack space is tight, outlet-level switching is needed, or runtime must go beyond internal batteries. Choose the P91g Li when a standard 2U platform with internal runtime is the better fit.
Why does 50 degrees C matter?
Because most racks are not air conditioned. IDF closets, telecom rooms and industrial enclosures regularly sit at 35-40 C, and VRLA batteries specified at 25 C degrade rapidly above 30 C. The P91g Li is rated to 50 C with derating above 40 C, which covers the real range of deployment environments rather than the ideal one.
How long do the batteries last?
Up to 15 years or 3,000-5,000 discharge cycles. The practical comparison is against the 3 to 5 year VRLA replacement cycle. Across a distributed estate, removing that cycle removes both the parts cost and the site visit, and the visit is usually the larger number.
Can the batteries be replaced without dropping the load?
Yes. The internal battery pack is hot-swappable, and an optional XBDM bypass distribution module lets the UPS itself be serviced or swapped without interrupting the critical load. On a rack that cannot go down, the XBDM is usually specified with the UPS rather than added later.
What output voltage does it deliver?
200, 208, 220, 230 or 240 VAC, selectable. Note that capacity derates to 80% at 200 or 208 VAC, so size on the derated figure at the voltage you will actually run rather than on the nameplate.
Is the P91g Li TAA compliant?
Yes. Note that the certifications on this 208-240 V platform are CE and RoHS, with battery packs to UL1973 and UN38.3; there is no UL listing on this range. TAA compliance and safety listing are separate questions, and both matter on a regulated bid.
What is the warranty?
Six years on electronics and battery in the USA and Canada, reducing to two years where ambient temperature exceeds 40 C and is below 50 C, and two years depot repair outside the USA and Canada. In the USA and Canada, units installed at 208 or 240V carry a $50,000 connected-equipment load protection policy, with registration required within 10 days of purchase.
Documents and related links
Plan with confidence
Xtreme Power supports consultants, facility engineers, and system integrators with lithium UPS deployment strategy, distributed infrastructure planning, and lifecycle modernization for 208–240 V environments.
