E91 15 kVA vs APC Easy UPS 3S 15 kVA
The Xtreme Power E91 15 kVA and the APC Easy UPS 3S 15 kVA (E3SUPS15KFB1) are online double-conversion UPS systems for 208/120V three-phase applications, both delivering full 15 kVA / 15 kW usable capacity with internal VRLA batteries. The E91 provides equivalent runtime performance within a significantly smaller enclosure and broader standard warranty coverage.
Where the E91 15 kVA leads
- Equivalent runtime at full rated load (9 min @ 15 kW).
- A significantly smaller cabinet footprint — 11.9 × 34 × 40.2 in vs 15 × 38 × 55 in.
- Full 15 kVA / 15 kW usable output.
- Equivalent high-efficiency operation.
- Broader standard warranty coverage.
15 kVA three-phase UPS, side by side
| Specification | Xtreme Power E91 15 kVA | APC Easy UPS 3S 15 kVA (E3SUPS15KFB1) | Advantage |
|---|---|---|---|
| Rated capacity | 15 kVA / 15 kW | 15 kVA / 15 kW | Equal usable power |
| Voltage | 208/120V, 3-phase | 208/120V, 3-phase | Direct electrical match |
| UPS topology | Online double-conversion | Online double-conversion | Equivalent protection |
| Battery architecture | Internal VRLA batteries | Internal VRLA battery strings | Integrated batteries |
| Internal runtime (full load) | 9 min @ 15 kW | 9 min @ 15 kW | Runtime parity |
| Efficiency (online / ECO) | Up to 94% / 98% | Up to 94% / 98% | Equivalent efficiency |
| Dimensions (W × D × H) | 11.9 × 34 × 40.2 in | 15 × 38 × 55 in | Smaller enclosure |
| Warranty | 2-year parts; start-up & labor optional | 1-year with certified start-up | Longer standard coverage |
| TAA compliance | TAA compliant | TAA available | Eligible for federal procurement |
Both are true online double-conversion three-phase UPS with full 15 kW usable output, internal VRLA batteries, equivalent efficiency, matching 9-minute full-load runtime, and comparable TAA eligibility. With runtime at parity, the E91 leads on footprint and standard warranty. Confirm current APC specifications against Schneider documentation.
Choosing between them
With equivalent protection and matching full-load runtime, the decision turns on footprint and warranty. Choose the E91 for a smaller enclosure and longer standard coverage; the Easy UPS 3S fits where an existing APC/Schneider standard governs or a larger cabinet is acceptable.
Choose the E91 15 kVA if you need
- A smaller UPS footprint
- Equivalent runtime at full load
- Full 15 kW usable capacity
- Longer standard warranty coverage
- Compact cabinet deployment
The Easy UPS 3S 15 kVA (E3SUPS15KFB1) may fit if you need
- Facilities standardized on APC / Schneider infrastructure
- Alignment with Easy UPS deployments
- A larger cabinet footprint is acceptable
Related comparisons
Standardizing compact three-phase UPS across your facilities?
Xtreme Power supports E91 three-phase UPS sizing, runtime planning with external battery cabinets, modernization strategy for legacy three-phase UPS, and TAA-compliant procurement for healthcare, education, retail, industrial, and enterprise infrastructure.