Vertiv AS4D0NCJGNNXLKB 20kVA Scalable Online UPS
Overview
The Vertiv AS4D0NCJGNNXLKB is a 20kVA / 18.0kW online UPS designed for facilities that need room to grow without replacing infrastructure. It ships at full 20kVA capacity with a hardwire input (L-L-G) and supports optional Power Distribution (POD) output modules, making it a fit for data centers, network equipment rooms, and critical facility infrastructure where load profiles evolve over time. The scalable-to-20kVA / 18.0kW ceiling means this unit is already at its architectural maximum — you are buying the top of the AS4D family, not a stepping stone. If you are comparing within the Vertiv APS line, this is the model to spec when you know the load will push the platform's limits.
Key Features
- 20kVA / 18.0kW Power Capacity: Supports high-density rack environments or consolidated server rooms where aggregate load regularly exceeds 15kVA. At 18.0kW true power, you have headroom for mixed IT and network loads without derating concerns on a second unit.
- Scalable to 20kVA / 18.0kW (N+1 Ready): The platform architecture supports N+1 redundancy configuration within the same scalable-to ceiling. For a UPS deployment where a single unit failure cannot take down the load, pairing units in a parallel-redundant topology is the correct approach at this capacity tier.
- Hardwire Input (L-L-G): No cord-and-plug connection — this unit requires direct electrical panel termination. That means a licensed electrician for installation, but it also means the connection is code-compliant for permanent commercial installations and eliminates plug failure as a single point of failure.
- Hardwire + Optional POD Output: Base output is hardwired, matching the input for clean commercial installations. Optional POD (Power Output Distribution) modules let you add managed receptacle distribution without a separate PDU chassis, consolidating the distribution layer and reducing cable management complexity.
- 10-Minute Full-Load Runtime: At 20kVA / 18.0kW, the internal battery delivers 10 minutes of runtime — enough for a controlled shutdown sequence or generator transfer on most facility designs. Plan your generator ATS transfer time against this figure before finalizing the design. See the power distribution category for compatible distribution components.
- 26-Minute Half-Load Runtime: At 50% load (10kVA / 9.0kW), runtime extends to 26 minutes. If your actual connected load runs well below the UPS rating — common in right-sized deployments — you gain meaningful additional transfer window without adding external battery cabinets.
- Family Context — AS4D0NCXGNNXLKB vs AS4D0NCJGNNXLKB: The sibling AS4D0NCXGNNXLKB shares the same 20kVA capacity and scalable ceiling but delivers only 5 minutes at full load versus 10 minutes here. If runtime is the decision variable, the AS4D0NCJGNNXLKB is the correct selection within this family. Pair with a power conditioning solution upstream for sensitive equipment.
Integration and Compatibility
The hardwire I/O configuration suits permanent electrical infrastructure. Optional POD modules extend output flexibility for mixed load types. Confirm panel ampacity, breaker sizing, and conduit routing with the installing electrician before procurement — hardwire UPS installations require facility-side preparation that cord-connected units do not. Review the full Vertiv power portfolio for battery cabinets and monitoring accessories that pair with the APS platform.
Frequently Asked Questions
Q: What is the difference between the AS4D0NCJGNNXLKB and the AS4D0NCXGNNXLKB?
A: Both are 20kVA / 18.0kW units with a 20kVA scalable ceiling. The AS4D0NCJGNNXLKB provides 10 minutes of full-load runtime and 26 minutes at half load. The AS4D0NCXGNNXLKB provides only 5 minutes at full load and 15 minutes at half load. Choose the AS4D0NCJGNNXLKB when your generator transfer or shutdown sequence requires more than 5 minutes of bridge time.
Q: Does the AS4D0NCJGNNXLKB require a hardwire electrical connection?
A: Yes. Both input and base output are hardwired (L-L-G). There is no cord-and-plug option for this unit. A licensed electrician must handle installation and panel termination.
Q: What does 'Scalable to 20kVA / 18.0kW' mean for this model?
A: This unit already ships at the platform's maximum capacity of 20kVA / 18.0kW. The 'scalable to' designation refers to the platform's N+1 parallel-redundancy architecture — you can pair units for redundancy, not expand a single unit beyond its rated capacity.
Q: What are the optional POD outputs on the AS4D0NCJGNNXLKB?
A: POD (Power Output Distribution) modules are optional add-on distribution units that attach to the base UPS output. They add managed receptacle distribution without requiring a separate PDU chassis. The base output remains hardwired; PODs extend distribution flexibility for varied load types.
Q: How does the 10-minute full-load runtime affect generator sizing decisions?
A: The 10-minute bridge at full 20kVA / 18.0kW load defines the maximum allowed generator start-and-transfer time for this installation. If your generator ATS requires more than 10 minutes under worst-case conditions, you need external battery cabinets or a longer-runtime variant from the Vertiv APS family to avoid a gap in protection.
The AS4D0NCJGNNXLKB is the runtime-optimized version of the 20kVA APS platform — and that 10-minute full-load bridge is what separates it from its sibling. In generator-backed facilities where ATS transfer can take 30 to 90 seconds under normal conditions but could stretch to several minutes under fault conditions, 10 minutes of headroom at full 18.0kW is a meaningful margin. I spec this unit when the facility generator is diesel-start with a manual transfer option as a fallback — you want time to react, not just coast.
Technical Highlights:
- 20kVA / 18.0kW Capacity: Top of the AS4D platform family — no uprating possible on a single unit, so load planning at procurement is critical. Size to 80% of rated capacity (16kVA) for thermal and battery longevity.
- 10-Min Full / 26-Min Half-Load Runtime: The half-load figure is operationally significant — most real data center loads run 40–60% of UPS rating, so 26 minutes at 10kVA is the more realistic bridge time for many installations.
- Optional POD Output Modules: Eliminates a standalone PDU chassis for mixed-load rooms. Confirm POD compatibility and receptacle configurations with Vertiv before ordering — not all POD types are interchangeable across APS generations.
Deployment Considerations:
- Hardwire L-L-G input requires panel preparation before the unit arrives on site — coordinate electrical rough-in with the UPS delivery schedule to avoid staging delays.
- The AS4D0NCJGNNXLKB is already at the scalable-to ceiling (20kVA / 18.0kW), so N+1 redundancy requires a second unit, not a module upgrade. Budget and space plan for a parallel unit from day one if redundancy is a requirement.
This unit is the right call for a single-room data center or network operations hub where a diesel generator is part of the power plan and the ATS transfer window cannot be guaranteed under 5 minutes. It is not the right fit for installations where load may grow beyond 20kVA — at that scale, the architecture shifts to a higher-tier three-phase modular UPS platform entirely.
