30 kVA 208/120 V Three-Phase Online UPS Comparison
Large-frame three-phase UPS systems are deployed in healthcare facilities, data infrastructure, manufacturing, and distributed critical power environments requiring robust online protection, scalable runtime, and reliable installation. The Xtreme Power E91 30 kVA and Eaton 9355 30 kVA are online double-conversion UPS systems designed for 208/120 V three-phase applications.
Both platforms provide high-quality double-conversion power protection and integrated maintenance bypass capability. However, significant differences exist in usable real-power output, operating efficiency, system weight, runtime at rated load, and standard ownership coverage.
The E91 30 kVA delivers full 30 kW output at unity power factor with higher operating efficiency and dramatically lower system weight. The Eaton 9355 provides longer base runtime but at reduced usable output (27 kW) and more than double the system weight.
For facilities prioritizing maximum usable capacity, lighter installation, and efficient operation, the E91 30 kVA provides a more deployment-friendly and ownership-optimized solution.
Learn more about the Xtreme Power E91 Series
https://xpcc.com/products/e91/
Key Differentiators at a Glance
- Full 30 kVA / 30 kW usable output (unity power factor)
• Higher operating efficiency
• Dramatically lighter system weight
• Runtime specified at full rated load
• Factory start-up included as standard
• Longer standard electronics warranty
30 kVA Three-Phase UPS Feature Comparison
208/120 V Applications
| Feature | Xtreme Power E91 30 kVA | Eaton 9355 30 kVA | Notes / Considerations |
| Rated Capacity | 30 kVA / 30 kW | 30 kVA / 27 kW | Full real-power output (unity PF) |
| Output Power Factor | 1.0 | 0.9 | More usable kW from same kVA |
| UPS Topology | Online double conversion | Online double conversion | Comparable protection architecture |
| Efficiency (Online) | 94% | 91% | Lower energy and cooling demand |
| Maintenance Bypass | Standard (integrated) | Standard (integrated) | Seamless servicing |
| Dimensions (H × W × D) | 65.6 × 23.6 × 36.3 in | 66.0 × 20.0 × 34.1 in | Higher usable power in lighter cabinet |
| Weight (with batteries) | 496 lb | 1,160 lb | Dramatically lower floor loading |
| Internal Runtime | 6 min (std) / 9 min (opt) @ 30 kW | 11 min @ 27 kW | Runtime specified at higher load |
| Runtime Expansion | External battery cabinets | External battery cabinets | Comparable scalability |
| Warranty (Electronics) | 2 years | 1 year parts | Longer standard coverage |
| Start-up & Labor | Factory start-up included | Start-up optional; 90-day labor | Lower deployment cost |
| TAA Compliance | TAA compliant | TAA compliant | Eligible for federal procurement |
Download the Printable Comparison
Download the Xtreme Power E91 30 kVA vs Eaton 9355 comparison PDF
Ideal for engineering submittals, bid reviews, and procurement evaluations.
https://xpcc.com/wp-content/uploads/Xtreme-E91-30k-Eaton-9355-Comparison.pdf
Where the E91 30 kVA Excels
- Facilities requiring full 30 kW usable output
• Deployments prioritizing lighter equipment
• Installations with floor loading constraints
• Projects seeking higher operating efficiency
• Applications requiring runtime at full rated load
• Specifications requiring longer electronics warranty
• Federal projects requiring TAA compliance
When the Eaton 9355 May Be a Fit
- Facilities standardized on Eaton infrastructure
• Installations prioritizing longer internal runtime
• Sites aligned with existing 9355 deployments
• Locations where higher system weight is acceptable
Who Should Choose Which?
Choose the Xtreme Power E91 30 kVA if you need:
- Full 30 kW usable capacity
• Significantly lighter UPS system
• Higher operating efficiency
• Runtime specified at full load
• Factory start-up included
• Longer standard electronics warranty
Choose the Eaton 9355 if you need:
- Longer base internal runtime
• Alignment with existing Eaton deployments
• Standardization with 9355 infrastructure
Compare E91 30 kVA to Other Compact 3-Phase UPS Alternatives
Evaluating large-frame three-phase UPS platforms or planning multi-site standardization?
View all E91 Series comparisons:
https://xpcc.com/e91-ups-comparisons/
Plan With Confidence
Xtreme Power Conversion supports specification development, runtime planning, and three-phase UPS deployment for healthcare, education, retail, industrial, and distributed IT environments.
(800) 582-4524
sales@xpcc.com