P91-3kLi: 3000 VA Lithium Iron Phosphate (LFP) UPS
The largest P91 Li: 3000 VA / 2700 W of online double-conversion protection with Lithium Iron Phosphate (LiFePO₄) batteries rated for up to 15 years, 3 to 4 times the life of lead acid.
It delivers its full 2700 W on internal battery with 10 minutes of runtime at full load. At 45.2 lbs it is the lightest of the 3 kVA lithium rack UPS compared here, with the longest standard warranty and a connected-equipment load protection policy the others don’t offer.
Why the P91-3kLi stands out
Up to 15-year design life and 3,000–5,000 charge cycles, 3 to 4 times longer than lead acid.
10 minutes at 2700 W on internal battery. The Vertiv runs 6.5 minutes at the same load; the Eaton is limited to 2400 W without an external pack.
45.2 lbs, against 48.5 to 52.8 lbs for the Eaton, Vertiv and APC 3 kVA lithium models.
Continuous, regulated power with zero transfer time for servers, storage and network cores.
Back to 90% in about 1.5 hours after an outage, against about 2 hours for Vertiv and APC and up to 3 hours for Eaton.
Operates in closets and edge rooms up to 50 °C; Eaton’s 9PX lithium is rated to 40 °C.
A 30 A locking outlet for a PDU or large load, plus six standard receptacles, including a controllable bank.
Optional Web/SNMP card for alarms, logging and remote output control; RS-232, USB and EPO standard.
Electronics and lithium battery (USA and Canada). Reduced to 2 years in 40–50 °C environments; 2 years depot repair elsewhere.
Connected equipment is covered up to $50,000 in the USA and Canada. Register within 10 days.
Qualifies for U.S. government, education and public-sector procurement.
A strong alternative to other 3 kVA lithium UPS models
All four units compared here are 2U, online and lithium at 3000 VA / 2700 W. The differences are in warranty, weight, protection and procurement.
Where the P91-3kLi leads: full 2700 W on internal battery with the longest full-load runtime, a 6-year full warranty (Eaton and Vertiv 5 years, APC 3 years on the UPS), the lightest chassis at 45.2 lbs, the fastest recharge, operation to 50 °C, a $50,000 connected-equipment load protection policy, and TAA compliance.
P91-3kLi at a glance
View the P91 Li datasheet » Full P91 Li specifications and runtimes »
How the P91-3kLi compares at 3 kVA
| Feature | Xtreme P91-3kLi | Eaton 9PX3000RT-L | Vertiv GXT5LI-3000LVRT2UXL | APC SRVSL3KRARK |
|---|---|---|---|---|
| Output capacity | 3000 VA / 2700 W | 3000 VA / 2400 W on internal battery (2700 W with external packs) | 3000 VA / 2700 W | 3000 VA / 2700 W |
| Runtime at full load | 10 min at 2700 W | About 10 min at 2400 W | 6.5 min at 2700 W | Not published for this model |
| Runtime at 1350 W | 21 min | About 19 min | 15 min | Not published for this model |
| Topology | Online double-conversion | Online double-conversion | Online double-conversion | Online double-conversion |
| Battery | LiFePO₄ (LFP) | LiFePO₄ | Lithium-ion | Lithium-ion |
| Weight | 45.2 lbs | 52.8 lbs | about 48.5 lbs | 48.7 lbs |
| Depth | 23.8″ rack (24.8″ with bezel) | 23.8″ | about 21.5″ | 24.9″ |
| Recharge | About 1.5 h to 90% | Under 3 h to 90% | About 2 h | About 2 h |
| Max operating temp | 50 °C | 40 °C | Not verified | Not verified |
| Battery life rating | Up to 15 years | 8 years float at 25 °C | Up to 3× VRLA | 8–10 years |
| Warranty | 6-year full | 5-year | 5-year | 3-year UPS, 5-year battery |
| TAA compliant | Yes, standard | No (TAA version is a separate SKU) | No (TAA version is a separate SKU) | No |
Eaton, Vertiv and APC are trademarks of their respective owners and are referenced here for factual comparison only. Competitor specifications are based on published manufacturer and distributor data and are subject to change; verify current figures before purchase. Competitor depths are as published; the P91-3kLi figure is rack-mounting depth. Eaton recharge, temperature and battery-life figures are from the Eaton 9PX Lithium-Ion user guide (Rev 08). Vertiv runtimes are from the GXT5 Lithium-Ion installer/user guide (Table 8.7, internal battery). Eaton runtimes are read from Eaton’s online runtime chart and are approximate; without an external battery module the 9PX3000RT-L is limited to 2400 W. TAA: Eaton and Vertiv offer TAA-compliant versions under separate part numbers; APC states its TAA SKUs carry a US or TAA suffix. Competitor data checked October 2026.
See detailed head-to-head comparisons →Where the P91-3kLi fits
Need 3 kVA in 1U? See the J90 1U online lithium UPS. Need less capacity? See the P91-2kLi 2000 VA comparison or the short-depth P91-1kLi 1000 VA comparison.
P91-3kLi: frequently asked questions
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