P91-1.5kLi vs Vertiv Liebert GXT5Li-1500LVRT2UXL
The P91-1.5kLi and Vertiv Liebert GXT5Li-1500LVRT2UXL are both 1.5 kVA online double-conversion LiFePO₄ UPS with equal real power. The P91-1.5kLi is engineered for longer service life, higher-temperature operation, faster recharge, and TAA eligibility; the Vertiv XL model prioritizes longer internal runtime.
What the P91-1.5kLi brings
- Nearly double battery service life (up to 15 yr)
- Operation up to 50 °C vs 40 °C
- Faster recharge (1.5 h vs 2 h to 90%)
- TAA compliance for government procurement
- 6-year vs 5-year warranty
Side-by-side specifications
| Specification | Xtreme Power P91-1.5kLi | Vertiv Liebert GXT5Li-1500LVRT2UXL | Advantage |
|---|---|---|---|
| Battery chemistry | LiFePO₄ with integrated BMS | LiFePO₄ with integrated BMS | Comparable technology |
| Battery life | Up to 15 yr / 3,000–5,000 cycles | 8–10 years | P91 – nearly double service life |
| Capacity | 1500 VA / 1350 W | 1500 VA / 1350 W | Equal real power |
| Topology | Online double-conversion | Online double-conversion | Equivalent protection |
| High-temperature operation | Up to 50°C, derates above 40°C | Rated to 40°C | P91 – high-heat environments |
| Recharge | 1.5 h to 90% | 2 h to 90% | P91 – faster recovery |
| Runtime (full load) | 8 min | 14 min | Vertiv – longer internal runtime |
| TAA compliance | Yes | No | P91 – federal procurement |
| Warranty | 6-year UPS & battery | 5-year UPS & battery | P91 – longer coverage |
Specifications from Xtreme Power’s supplied P91-1.5kLi vs Vertiv GXT5Li-1500LVRT2UXL comparison; confirm against current vendor documentation. The Vertiv XL is an extended-runtime model and runs longer at full load.
Choosing between them
Both are online LiFePO₄ units at equal power. The P91-1.5kLi leads on service life, temperature, recharge, TAA, and warranty; the Vertiv XL delivers notably longer internal runtime (14 vs 8 min).
Choose the P91-1.5kLi if you need
- Edge / distributed IT with elevated temperatures
- Fast battery recharge after outages
- Long-life installations focused on TCO
- Government / public-sector projects requiring TAA
The Liebert GXT5Li-1500LVRT2UXL may fit if you need
- Deployments prioritizing longer internal runtime
- Climate-controlled rooms with predictable maintenance
- Sites standardized on Vertiv platforms
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