P91-5K vs Vertiv Liebert GXT5-5KL630RT3UXLN
The Xtreme Power P91-5K (with the BPXR2U240A battery pack) and Vertiv Liebert GXT5-5KL630RT3UXLN are online double-conversion UPS for mission-critical IT and infrastructure loads, both on VRLA batteries. The P91-5K configuration prioritizes longer baseline runtime, higher usable watts, modular bypass and distribution (XBDM), and built-in TAA compliance; the GXT5 emphasizes integrated internal batteries in a compact UPS-only chassis.
What the P91-5K brings
- Higher usable watt capacity (5 kW vs 4.6 kW)
- Longer baseline runtime at full load (7 min vs 4.8 min)
- Optional XBDM modular bypass and distribution
- Runtime scaling via BPXR battery options
- TAA compliance for federal procurement
Side-by-side specifications
| Specification | Xtreme Power P91-5K + BPXR2U240A | Vertiv Liebert GXT5-5KL630RT3UXLN | Advantage |
|---|---|---|---|
| Capacity | 5 kVA / 5 kW | 4.9 kVA / 4.6 kW | P91 – higher usable watts (5 vs 4.6 kW) |
| Topology | Online double conversion | Online double conversion | Equivalent protection |
| Output voltage | 208 / 220 / 230 / 240 VAC | 208 / 220 / 230 / 240 VAC | Aligned voltage support |
| Runtime (full load) | 7 min at 5 kW | 4.8 min at 4.6 kW | P91 – longer runtime at higher load |
| External battery cabinets | Yes (BPXR series) | Yes (Vertiv EBCs) | Both scale runtime |
| Input / output architecture | Hardwired or optional XBDM modular bypass & distribution | L6-30P input; fixed receptacle set | P91 – modular bypass and distribution |
| Rack height | 4U total (2U UPS + 2U battery) | 3U UPS | Vertiv 1U shorter; P91 trades 1U for runtime |
| Battery technology | VRLA | VRLA | Comparable chemistry |
| Compliance / listings | UL1778, cUL, FCC, CE, RoHS, TAA | UL1778, c-UL, CSA, FCC Class A | Both UL1778 listed |
| TAA compliance | Yes | No | P91 – federal procurement |
| Warranty | 3 yr electronics / 3 yr battery | 3 yr electronics / 3 yr battery | Aligned coverage |
Specifications from Xtreme Power’s P91-5K vs Vertiv GXT5 comparison; confirm against current vendor documentation. P91-5K runtime shown with the BPXR2U240A battery pack.
Choosing between them
The P91-5K leads on usable watts, runtime, modular bypass and distribution, and TAA; the GXT5 offers a more compact 3U UPS-only chassis for Vertiv-standardized, non-regulated sites.
Choose the P91-5K if you need
- Higher usable watt capacity (5 kW vs 4.6 kW)
- Longer baseline runtime at full load
- Modular bypass and distribution (XBDM) for service and expansion
- Built-in TAA compliance for government, education, and public-sector
- Flexible runtime scaling with BPXR options
The Liebert GXT5 may fit if you need
- A more compact UPS-only footprint (3U)
- Alignment with an existing Vertiv ecosystem
- A non-regulated deployment with modest runtime needs
Frequently asked questions
The Xtreme Power P91-5K (with the BPXR2U240A pack) is a common alternative, delivering higher usable watts (5 kW vs 4.6 kW) and longer baseline runtime with optional XBDM modular bypass and distribution.
The P91-5K is rated at unity power factor (5 kVA / 5 kW), while the GXT5 delivers 4.6 kW from 4.9 kVA. Since modern IT runs near unity PF, the P91’s full 5 kW is usable real power.
The P91-5K’s 4U includes a dedicated 2U battery pack that delivers longer baseline runtime, about 7 minutes at 5 kW vs 4.8 minutes at 4.6 kW. The extra 1U buys runtime.
Yes. The P91-5K is UL1778 listed and TAA compliant for federal, education, and public-sector procurement; the GXT5-5KL630RT3UXLN is not TAA listed.
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Specifying a 5-10 kVA online UPS?
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