E91 40 kVA vs APC Easy UPS 3S 40 kVA
The Xtreme Power E91 40 kVA and the APC Easy UPS 3S 40 kVA are online double-conversion UPS systems for 208/120V three-phase applications, both delivering full 40 kVA / 40 kW usable capacity with internal VRLA batteries. The E91 provides defined internal runtime at full rated load within a single integrated cabinet and broader standard warranty coverage; the Easy UPS 3S offers modular internal battery strings with runtime dependent on configuration and optional start-up coverage.
Where the E91 40 kVA leads
- Defined internal runtime at full rated load — 6 min @ 40 kW, where APC runtime varies by configuration.
- A single integrated battery cabinet.
- Full 40 kVA / 40 kW usable output.
- Equivalent high-efficiency operation.
- Broader standard warranty coverage.
40 kVA three-phase UPS, side by side
| Specification | Xtreme Power E91 40 kVA | APC Easy UPS 3S 40 kVA | Advantage |
|---|---|---|---|
| Rated capacity | 40 kVA / 40 kW | 40 kVA / 40 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 modular VRLA strings | Integrated batteries |
| Internal runtime (full load) | 6 min @ 40 kW | Runtime varies by configuration | Defined runtime included |
| Efficiency (online / ECO) | Up to 94% / 98% | Up to 94% / 98% | Equivalent efficiency |
| Dimensions (W × D × H) | 23.6 × 36.3 × 65.6 in | 20 × 43 × 55 in | Single integrated cabinet |
| 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 40 kW usable output, equivalent efficiency, and comparable TAA eligibility. The E91 delivers a defined full-load runtime within a single integrated cabinet where APC runtime varies by configuration, plus broader standard warranty. Confirm current APC specifications against Schneider documentation.
Choosing between them
Both deliver equivalent protection at 40 kW. Choose the E91 for a defined full-load runtime, a single integrated cabinet, and longer standard coverage; the Easy UPS 3S fits where configurable internal runtime or an existing APC/Schneider standard governs.
Choose the E91 40 kVA if you need
- Defined runtime at full rated load
- An integrated battery cabinet
- Full 40 kW usable capacity
- Longer standard warranty coverage
- Predictable runtime configuration
The Easy UPS 3S 40 kVA may fit if you need
- Facilities standardized on APC / Schneider infrastructure
- Configurable internal battery runtime is preferred
- Alignment with Easy UPS deployments and Schneider service continuity
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.