P91-5K vs Dell-APC Smart-UPS On-Line DLRT5KRMXLT
The Xtreme Power P91-5K (with the BPXR2U240A battery pack) and Dell-APC Smart-UPS On-Line DLRT5KRMXLT are online double-conversion UPS for mission-critical IT and infrastructure loads, both on VRLA batteries. The P91-5K configuration prioritizes higher usable watt output, longer baseline runtime, modular bypass and distribution (XBDM), and built-in TAA compliance; the Dell-APC unit emphasizes integrated management in a compact 3U UPS-only chassis.
What the P91-5K brings
- Higher usable watt output (5 kW vs 4.25 kW)
- Longer baseline runtime at full load (7 min vs 4.4 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 | Dell-APC DLRT5KRMXLT | Advantage |
|---|---|---|---|
| Capacity | 5 kVA / 5 kW | 5 kVA / 4.25 kW | P91 – higher usable watts (5 vs 4.25 kW) |
| Topology | Online double conversion | Online double conversion | Equivalent protection |
| Output voltage | 208 / 220 / 230 / 240 VAC | 208 / 230 / 240 VAC | Comparable (P91 also lists 220 V) |
| Runtime (full load) | 7 min at 5 kW | 4.4 min at 4.25 kW | P91 – longer runtime at higher load |
| External battery cabinets | Yes (BPXR series) | Yes | 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 | Dell-APC 1U shorter; P91 trades 1U for runtime |
| Battery technology | VRLA | VRLA | Comparable chemistry |
| Compliance / listings | UL1778, cUL, FCC, CE, RoHS, TAA | UL1778, cUL, FCC Part 15 A, ENERGY STAR | Both UL1778 listed |
| TAA compliance | Yes | No | P91 – federal procurement |
| Warranty | 3 yr electronics / 3 yr battery | 3 yr electronics / 3 yr battery | Equivalent coverage |
Specifications from Xtreme Power’s P91-5K vs Dell-APC DLRT5KRMXLT 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 TAA; the DLRT5KRMXLT offers a compact 3U UPS-only chassis with integrated management for Dell-APC-standardized, non-regulated sites.
Choose the P91-5K if you need
- Higher usable watt output (5 kW vs 4.25 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 DLRT5KRMXLT may fit if you need
- A more compact 3U UPS-only design
- Alignment with an existing Dell-APC ecosystem
- A non-regulated deployment with modest runtime needs
Frequently asked questions
The Xtreme Power P91-5K is commonly evaluated as an alternative, delivering higher usable watts (5 kW vs 4.25 kW) and longer baseline runtime with optional XBDM modular bypass and distribution.
The P91-5K is rated at unity power factor (5 kW from 5 kVA), while the DLRT5KRMXLT delivers 4.25 kW from 5 kVA, a 0.85 power factor. Because modern IT runs near unity PF, the P91 supports more real equipment load from the same VA class.
The P91-5K’s 4U includes a 2U battery pack for longer baseline runtime, about 7 minutes at 5 kW vs 4.4 minutes at 4.25 kW. The extra 1U buys runtime.
Yes. The P91-5K is UL1778 listed and TAA compliant for federal and public-sector procurement; the DLRT5KRMXLT is not TAA listed.
Related comparisons
Specifying a 5-10 kVA online UPS?
Xtreme Power supports specification, runtime sizing, and design-in for enterprise IT, telecom, healthcare, education, and public-sector racks.