Vertiv AL4D0NHXGNNXLKB 20kVA/18kW 3-Phase Online UPS with Hot-Swap Modules
Overview
The Vertiv AL4D0NHXGNNXLKB is a 20kVA/18kW three-phase online UPS designed for mid-to-large commercial deployments where power continuity is non-negotiable — think enterprise server rooms, network operations centers, and physical security command infrastructure. It accepts 208VAC three-wire (L-L-G) input and delivers dual-voltage 208/120VAC output, making it practical in mixed-load environments where both three-phase equipment and standard 120VAC rack devices share the same UPS domain. The AL4D0NHXGNNXLKB supports hot-swap battery modules, meaning you can service or replace batteries without scheduling a maintenance window or taking loads offline — a real operational advantage in environments that can't afford downtime.
Explore the full Vertiv power protection line for scalable UPS options across capacity ranges, or browse the power protection and UPS category to compare this unit against alternative topologies.
Key Features
- 20kVA / 18kW at N+1 Capacity: At full N+1 configuration, this unit handles up to 20kVA/18kW of connected load — enough to cover a dense server rack environment or a multi-rack security operations center without requiring a second standalone UPS chassis. N+1 redundancy means one module can fail or be swapped while the system continues protecting the load, eliminating single points of failure in critical infrastructure.
- 208VAC Three-Wire (L-L-G) Input: The L-L-G wiring configuration aligns with standard commercial building power distribution — no special transformer required if your facility is already provisioned with 208V three-phase service. This simplifies installation in data centers, telecom rooms, and large commercial security head-end rooms where 208V panels are the norm.
- 208/120VAC Dual-Voltage Output: The simultaneous 208VAC and 120VAC output capability is operationally significant: you can power three-phase server and networking hardware alongside standard 120VAC rack PDUs from a single UPS, reducing the number of power distribution devices in the stack and simplifying your single-line diagram.
- Up to 92% Efficiency: Running at up to 92% efficiency means less heat generated per kW of load — directly reducing cooling load in the equipment room. On a 18kW draw running 24/7, a few percentage points of efficiency improvement adds up to meaningful energy cost savings over a multi-year deployment lifecycle.
- 8-Minute Runtime at Full Load: The 8-minute battery runtime provides enough bridge time to execute a controlled shutdown sequence on connected servers or to ride through the utility transfer time on a generator-backed facility. This is a design spec, not a buffer — plan your shutdown scripts accordingly, and size runtime extensions if your generator transfer time or shutdown sequence exceeds this window.
- Hot-Swap Architecture: Battery and module replacement without dropping load is the core value of the hot-swap design. For 24/7 operations — security operations centers, network management hubs, continuous recording NVR stacks — the ability to replace a battery module during business hours without a maintenance window eliminates scheduled downtime entirely.
- Operating Temperature 0°C to 40°C (32°F to 104°F): The rated operating envelope covers standard conditioned equipment room environments. At 40°C upper limit, this unit is not rated for unconditioned spaces or high-ambient industrial environments — keep it in a climate-controlled room. If ambient temperatures regularly exceed 35°C, factor in derating and battery longevity impacts.
- 704 lbs Shipping Weight: At 704 lbs, this is a floor-standing installation requiring proper structural planning. Verify your raised floor or concrete slab load rating before placement. Factor in fork-lift or pallet jack access to the equipment room during installation — the 17-inch width fits a standard 19-inch rack bay footprint but the 49-inch height and 34-inch depth demand clearance planning for front and rear service access.
Integration & Compatibility
The AL4D0NHXGNNXLKB is built for commercial and enterprise power infrastructure running 208VAC three-phase distribution. It fits naturally into facilities with existing 208V panel infrastructure, pairing with rack-mount PDUs that accept 208V input and distribute 120VAC to individual devices. The dual-voltage output supports mixed environments: three-phase networking and server loads on the 208VAC legs, and standard rackmount security appliances, NVRs, and access control servers on 120VAC circuits.
For large-scale physical security deployments — surveillance head-ends with high-channel-count NVR stacks, multi-door access control servers, and video analytics appliances — this unit provides the power backbone that keeps the entire system online during utility events. If you are sizing a UPS for a network video recorder infrastructure or a converged security and IT equipment room, confirm your total load in kVA against the 20kVA ceiling and account for inrush current on server startup.
Review the UPS sizing and runtime planning guide to correctly match load, runtime, and battery extension requirements before ordering. For facilities requiring longer runtime, Vertiv offers external battery cabinet options in the same product family — consult the Vertiv product family documentation to confirm compatible external battery modules for this chassis.
Frequently Asked Questions
Q: What is the input voltage requirement for the AL4D0NHXGNNXLKB?
A: The AL4D0NHXGNNXLKB requires 208VAC three-wire (L-L-G) input. This is a standard three-phase commercial building voltage — verify your facility's panel output before ordering.
Q: What output voltages does the AL4D0NHXGNNXLKB provide?
A: It delivers dual-voltage output: 208VAC and 120VAC simultaneously. This allows a single UPS to support both three-phase server/networking loads and standard 120VAC rack devices.
Q: How long will the AL4D0NHXGNNXLKB power connected equipment during an outage?
A: The rated runtime is 8 minutes at full load. This is sufficient for controlled shutdowns or generator transfer in most facilities. If your shutdown sequence or generator transfer time exceeds 8 minutes, size external battery cabinets to extend runtime accordingly.
Q: Can batteries be replaced without taking the AL4D0NHXGNNXLKB offline?
A: Yes. The hot-swap design allows battery module replacement under load, eliminating the need to schedule a maintenance window or power down connected equipment during service.
Q: What is the maximum power capacity of the AL4D0NHXGNNXLKB?
A: The unit supports up to 20kVA / 18kW in an N+1 configuration, providing both the capacity and the redundancy to handle dense rack environments without a single point of failure.
Q: What are the physical installation requirements for the AL4D0NHXGNNXLKB?
A: The unit weighs 704 lbs and measures 49 in (H) × 17 in (W) × 34 in (D). Floor load capacity, pallet jack or forklift access, and front/rear service clearance must all be accounted for in the installation plan. It is rated for operating temperatures of 0°C to 40°C — a conditioned equipment room is required.
The AL4D0NHXGNNXLKB is one of those units I recommend when a security integrator is building out a substantial head-end room and wants a single power platform that handles both the three-phase networking backbone and the 120VAC security appliance layer. The 20kVA/18kW N+1 ceiling is the key spec — it gives you room to grow the rack without immediately bumping against the UPS limit, and the N+1 design means you're not betting the entire system on a single module.
Technical Highlights:
- Dual-voltage 208/120VAC output: Eliminates the need for separate UPS circuits for three-phase and single-phase loads — one unit feeds the whole room, which simplifies both the installation wiring and the ongoing maintenance picture.
- Up to 92% efficiency: On an 18kW continuous draw, a 92% efficiency rating keeps heat generation manageable. That matters directly for your CRAC unit sizing — every watt of waste heat is a watt your cooling system has to handle.
- Hot-swap modules: In a 24/7 security operations environment, this is the feature that pays for itself. Battery replacements happen on your schedule, not during a forced outage window.
Deployment Considerations:
- At 704 lbs, verify your raised floor tile rating and confirm forklift access before scheduling delivery. Many equipment rooms have weight restrictions on access paths that differ from the floor rating at the final position.
- The 8-minute runtime is a design spec at full 20kVA load — if you're running at 60-70% of capacity (a common real-world scenario), effective runtime will extend, but do not rely on that for shutdown scripting without confirming under actual load conditions.
This unit fits squarely in enterprise security head-end rooms, NOC infrastructure racks, and converged IT/security equipment rooms running 208V three-phase service — specifically where hot-swap serviceability and N+1 redundancy are hard requirements, not nice-to-haves.
