20kVA Online Double-Conversion UPS Comparison for Three-Phase Critical Loads
The Xtreme Power Li90 and the Eaton 9355 from Eaton are both high-performance, online double-conversion UPS systems designed to protect mission-critical three-phase loads in data centers, industrial facilities, healthcare environments, and infrastructure applications.
While both platforms provide continuous clean power and integrated maintenance bypass, meaningful differences appear in usable power output, battery technology, efficiency and heat dissipation, footprint, runtime options, operating temperature, and long-term lifecycle cost.
For environments where power density, thermal performance, and long-term operating efficiency matter, the Li90 delivers clear next-generation advantages.
Learn more about the Xtreme Power Li90
https://xpcc.com/products/li90/
Key Differentiators at a Glance
- Full 20kW usable power (unity power factor)
- Lithium iron phosphate (LiFePO₄) battery technology
- Significantly higher efficiency with lower heat output
- Much smaller and lighter footprint
- Longer internal runtime options
- Operation up to 50 °C (122 °F)
- Longer battery and system warranty coverage
- Lower installation, maintenance, and lifecycle costs
20kVA 208/120V Three-Phase UPS Feature Comparison
| Feature | Xtreme Power Li90 (20kVA) | Eaton 9355 (20kVA) | Li90 Advantage |
| Rated Capacity | 20kVA / 20kW | 20kVA / 18kW | Full usable power (unity PF) |
| UPS Topology | Online Double Conversion | Online Double Conversion | Equal protection |
| Battery Technology | Lithium Iron Phosphate (LiFePO₄) | VRLA (Lead-Acid) | Much longer life, smaller & lighter |
| Online Efficiency / Heat Output | ~94.5% / ~3,970 BTU/hr | ~91% / ~6,762 BTU/hr | Lower cooling requirements |
| Internal Battery Runtime | ~15 min @ 20kW (Li90-20k2) ~30 min @ 20kW (Li90-20k3) |
~18 min @ 18kW | More runtime flexibility |
| Battery Life Expectancy | Up to 15 years or 3,000–5,000 cycles | ~3–5 years or ~300 cycles | Dramatically fewer replacements |
| Maintenance Bypass | Integrated (standard) | Integrated (standard) | Equal serviceability |
| Operating Temperature | Up to 50 °C (122 °F) (derating above 40 °C) |
Up to 45 °C (113 °F) (derating above 40 °C) |
Better for hot environments |
| Physical Size / Weight (with base battery) | 12.6 × 35.2 × 49.2 in / ~387 lb | 20 × 34 × 66 in / ~1,160 lb | Roughly half the footprint and weight |
| Battery Warranty | 5 years (LiFePO₄) | 2 years (VRLA) | Longer coverage, lower risk |
| Start-Up & System Warranty | Start-up included; 2-year warranty (US & Canada) | 1-year parts / 90-day labor | Longer standard coverage |
Where the Li90 Excels
- 20kVA three-phase deployments requiring full usable kW
- Facilities with limited space or floor-loading capacity
- Electrical rooms with elevated ambient temperatures
- Sites seeking lower heat output and cooling costs
- Installations aiming to reduce battery replacements and service events
- Long-term projects focused on minimizing total cost of ownership
When the Eaton 9355 May Be a Fit
- Traditional data center environments with ample space
- Sites standardized on Eaton 9355 platforms
- Installations comfortable with more frequent VRLA battery replacement
Who Should Choose Which?
Choose Xtreme Power Li90 if you need:
- Full 20kW usable power in a 20kVA system
- Lithium UPS technology with long service life
- Higher efficiency and lower thermal output
- Much smaller and lighter three-phase UPS
- Longer runtime options without external cabinets
- Longer battery and system warranty coverage
Choose Eaton 9355 if you need:
- A traditional VRLA-based online UPS
- Alignment with existing Eaton 9355 deployments
- Standard operating conditions with controlled cooling
Download the Printable Comparison
Download the Xtreme Power Li90 vs Eaton 9355 (20kVA) Comparison PDF
https://xpcc.com/wp-content/uploads/Xtreme-Li90-Eaton-9355-20k-Comparison.pdf
(Ideal for specification reviews, project planning, and internal approvals)
Compare Li90 to Other UPS Alternatives
Evaluating lithium and VRLA UPS platforms for critical infrastructure?
View all Xtreme Power UPS comparisons
https://xpcc.com/ups-comparisons/
Plan with Confidence
Xtreme Power Conversion supports early specification, design-in, and lifecycle planning for data centers, industrial facilities, healthcare, and regulated environments.
(800) 582-4524
sales@xpcc.com