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Tall rectangular rack-tower UPS in dark grey metal, 38 by 17 by 34 inches, lithium-ion battery modules visible behind front panel

Vertiv

Vertiv AL6D0NHXGNNXLKB 20kVA/18.0kW 208/120VAC LLNG 8min UPS

SKU CH-AN75-538NF MPN AL6D0NHXGNNXLKB

Double-conversion online UPS delivers 20 kVA and 18 kW at 208/120 V with lithium-ion batteries providing 8 minutes at full load or 18 minutes at half load

  • Voltage version208 V
  • AC input voltage200/100, 208/120, 220/110, 230/115, 240/120 VAC
  • Input line frequency40 Hz to 70 Hz auto-sensing
  • Power input4-Wire (L-L-N-G)
  • Volt-ampere rating20kVA
  • Power rating18 kW

Model AL6D0NHXGNNXLKB

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  • 20 kVA double-conversion topology protects critical loads from power anomalies
  • Hot-swappable power, battery and control modules enable maintenance without interrupting connected equipment
  • Lithium-ion battery delivers 8 minutes at full load and 18 minutes at half load
  • Wide 200–240 VAC input range with 40–70 Hz auto-sensing suits global deployments
  • Rack/tower form factor fits 38 x 17 x 34 inch footprint for flexible installation

20kVA 18kW lithium-ion UPS

The Vertiv Liebert AL6D0NHXGNNXLKB is a double-conversion online UPS rated at 20kVA and 18.0kW. It accepts 200/100 through 240/120 VAC input with a 4-wire L-L-N-G connection and auto-senses frequency between 40 Hz and 70 Hz. The unit suits critical infrastructure that requires continuous, conditioned power.

Thermals noise and power draw

Operating temperature spans 32°F to 104°F (0°C to 40°C) with humidity tolerance of 0 to 95 percent non-condensing. Double-conversion topology isolates connected loads from input disturbances while maintaining a default 60 Hz output configurable to 50 Hz. Lithium-ion batteries deliver 8 minutes at full load and 18 minutes at half load.

Hot-swappable modules and form factor

Power, battery and control modules are hot-swappable, allowing maintenance without interrupting attached loads. The rack/tower chassis measures 38 by 17 by 34 inches and weighs 484 lbs. Output voltage mirrors the input range, providing 200/100 through 240/120 VAC to matched equipment.

How it compares

Measured against everything we stock in Uninterruptible Power Supplies (UPS), at today’s prices. Recalculated every night.

Price $33,636.99
Pricier than about 98% of the 1,153 comparable items (median $948.99).

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Specifications

Product
Brand nameVertiv
Product lineLiebert
Model nameAL6D0NHXGNNXLKB
Power
Voltage version208 V
AC input voltage200/100, 208/120, 220/110, 230/115, 240/120 VAC
Input line frequency40 Hz to 70 Hz auto-sensing
Power input4-Wire (L-L-N-G)
Volt-ampere rating20kVA
Power rating18 kW
Voltage output200/100, 208/120, 220/110, 230/115, 240/120 VAC
AC output frequency60 Hz default; 50/60 Hz user-configurable
Battery typeLithium Ion
Runtime on batteryFull Load: 8 mins.
Half Load: 18 mins.
Size & build
Product dimensions38 in × 17 in × 34 in
Product weight484 lb (220 kg)
Shipping weight219.54 kg
Package size965 × 965 × 432 mm
Environment & compliance
Temperature rangeOperating temperature: 32 °F - 104 °F (0 °C - 40 °C)
Humidity range0–95%, non-condensing

Other versions of this model

5 more in the same range

Questions about this item

How do I install the 4-wire L-L-N-G input connection on this 20kVA UPS, and what step is most often missed?

Connect the four conductors — two lines, neutral and ground — to the matching terminals, then verify phase rotation with a meter before closing the breaker; the step most often missed is confirming the neutral-to-ground bond matches site wiring.

What maintenance will the lithium-ion battery need and when should I plan replacement?

The lithium-ion cells require no scheduled fluid checks; plan replacement when runtime at full load drops below the rated 8 minutes or after the manufacturer’s design-life threshold, typically 10 to 15 years in 0°C–40°C ambient.

What limit appears first when this 18.0 kW double-conversion UPS runs continuously at full load?

The 8-minute battery runtime at 18.0 kW is the first hard limit; after that the inverter shuts down unless utility power returns or an external generator takes over.

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