Li90 vs Eaton 9355 20kVA
The Xtreme Power Li90 and the Eaton 9355 are both online double-conversion UPS for mission-critical three-phase loads in data centers, industrial, and healthcare facilities. Both provide clean power and integrated maintenance bypass — but the Li90 delivers full 20kW usable power at unity power factor, runs cooler, and installs far lighter with integrated lithium, where the 9355 derates to 18kW and uses VRLA.
Why engineers evaluate the Li90
- Full 20kW usable power (unity power factor)
- Lithium iron phosphate (LiFePO₄) battery technology
- Higher efficiency with significantly lower heat output
- Substantially lighter system weight
- Scalable internal runtime options
- Operation up to 50 °C (122 °F)
- Longer battery and system warranty coverage
20 kVA 208/120 V three-phase UPS comparison
| Feature | Xtreme Power Li90 (20kVA) | Eaton 9355 (20kVA) | Advantage |
|---|---|---|---|
| Rated capacity | 20kVA / 20kW | 20kVA / 18kW | Li90 — full usable power (unity PF) |
| Topology | Online double-conversion | Online double-conversion | Equal protection |
| Battery technology | Lithium iron phosphate (LiFePO₄) | VRLA (lead-acid) | Li90 — much longer life, smaller & lighter |
| Online efficiency / heat | ~94.5% / ~3,970 BTU/hr | ~91% / ~6,762 BTU/hr | Li90 — lower cooling requirements |
| Internal battery runtime | ~15 min @ 20kW (k2) · ~22 (k3) | ~18 min @ 18kW | Li90 — more runtime flexibility |
| Battery life | Up to 15 years / 3,000–5,000 cycles | ~3–5 years / ~300 cycles | Li90 — dramatically fewer replacements |
| Maintenance bypass | Integrated (standard) | Integrated (standard) | Equal serviceability |
| Operating temperature | Up to 50 °C (derating >40 °C) | Up to 45 °C (derating >40 °C) | Li90 — better for hot environments |
| Size / weight (base battery) | 12.6 × 35.2 × 49.2 in / ~387 lb | 20 × 34 × 66 in / ~1,160 lb | Li90 — significantly lighter |
| Battery warranty | 5 years (LiFePO₄) | 2 years (VRLA) | Li90 — longer coverage |
| Start-up & system warranty | Start-up included; 2-year on-site (USA) | 1-year parts / 90-day labor | Li90 — longer standard coverage |
Specifications based on publicly available manufacturer data; verify against current Eaton documentation. Both are online double-conversion; the Li90 uses LiFePO₄ at unity power factor. Li90 warranty: 5-yr battery (USA; ambient ≤40 °C — 2-yr at 40–50 °C) and 2-yr on-site UPS.
Choosing between them
Both are online double-conversion three-phase UPS, but the Li90 delivers full usable kW at unity power factor where the 9355 derates to 0.9, runs cooler (markedly lower BTU/hr), and installs far lighter with integrated lithium — no external battery cabinets or routine VRLA replacement.
Choose the Li90 if you need
- Full 20kW usable power in the system
- Lithium UPS technology with long service life
- Higher efficiency and lower thermal output
- Flexible internal runtime options
- Operation up to 50 °C
- Longer battery and system warranty coverage
Choose the Eaton 9355 if you need
- A traditional VRLA-based online UPS
- Alignment with existing Eaton 9355 deployments
- Standard operating conditions with controlled cooling
Related Li90 comparisons
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