P91g-3kLi vs Vertiv Liebert GXT5LI-3000IRT2UXL
The Xtreme Power P91g-3kLi and Vertiv Liebert GXT5LI-3000IRT2UXL are 208/230 V online double-conversion lithium rack UPS for IT, network, AV, and edge deployments, both on LiFePO₄ batteries in a 2U chassis. With equal 2700 W capacity and efficiency, the P91g-3kLi differentiates on much longer runtime at rated load, faster recharge, longer battery calendar life, TAA compliance, and a longer warranty; the GXT5LI offers a shorter-depth chassis.
What the P91g-3kLi brings
- Much longer runtime at rated load (11 min vs 6.5 min at 2700 W)
- Faster recharge recovery
- Up to 15-year LiFePO₄ battery life
- TAA-compliant lithium UPS
- Longer full-system warranty (6 vs 5 yr)
Side-by-side specifications
| Specification | Xtreme Power P91g-3kLi | Vertiv GXT5LI-3000IRT2UXL | Advantage |
|---|---|---|---|
| Battery chemistry | Lithium iron phosphate (LiFePO₄) | Lithium iron phosphate (LiFePO₄) | Equal chemistry |
| Capacity | 3000 VA / 2700 W | 3000 VA / 2700 W | Equal usable power |
| Topology | Online double conversion | Online double conversion | Equivalent protection |
| Runtime (internal) | 11 min at 2700 W | 6.5 min at 2700 W | P91g – much longer runtime |
| Recharge time | 1.5 hr to 90% | <2 hr typical | P91g – faster recharge |
| Battery calendar life | Up to 15 years | 8–10 years | P91g – longer calendar life |
| Efficiency (online) | Up to 94% | Up to 94% | Equal efficiency |
| Form factor | 2U rack (23.8 in depth) | 2U rack (21.5 in depth) | Vertiv – shorter depth (21.5 vs 23.8 in) |
| TAA compliance | Yes | No | P91g – federal eligible |
| Warranty | 6-year UPS + battery | 5-year lithium | P91g – longer coverage (6 vs 5 yr) |
Specifications from Xtreme Power’s P91g-3kLi vs Vertiv GXT5LI comparison; confirm against current vendor documentation. Both runtimes quoted at the full 2700 W load.
Choosing between them
With equal capacity and efficiency, the P91g-3kLi leads on runtime, recharge, battery calendar life, TAA, and warranty; the GXT5LI offers a shorter-depth 2U chassis for Vertiv-standardized sites.
Choose the P91g-3kLi if you need
- Much longer runtime at rated load
- Up to 15-year lithium battery life
- Faster recharge recovery
- TAA-compliant lithium UPS
- Extended full-system warranty
The Vertiv GXT5LI may fit if you need
- Alignment with existing Vertiv infrastructure
- Consistency with existing Vertiv lithium UPS
- A shorter rack-depth requirement (21.5 in)
Frequently asked questions
The Xtreme Power P91g-3kLi is a common alternative, a 208/230 V online LiFePO4 rack UPS that matches the 2700 W capacity while delivering much longer runtime, faster recharge, longer calendar life, and TAA compliance.
At the same 2700 W load the P91g-3kLi delivers about 11 minutes versus about 6.5 minutes for the GXT5LI, roughly 70% more internal runtime before transfer to battery is exhausted.
On depth, yes. The GXT5LI is 21.5 in deep versus the P91g-3kLi’s 23.8 in, both 2U. If rack depth is tight that favors the Vertiv; otherwise the runtime and lifecycle advantages favor the P91g.
Yes. The P91g-3kLi is TAA compliant for U.S. federal and public-sector procurement; the competitor unit is not TAA listed.
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