Vertiv Liebert EXL S1 and NXC Three-Phase UPS
The Vertiv Liebert EXL S1 and NXC are three-phase UPS systems for data centers and critical infrastructure. The large EXL S1 spans roughly 250 to 1200 kVA with Dynamic Online mode for very high efficiency, while the NXC spans about 30 to 200 kVA as a transformer-free, efficient mid-range platform. Comp-Utility, a long-standing Vertiv distribution partner, specs, installs, and services both across Central Texas.
What We Provide
Our Capabilities
Spec the Right Platform
We match the large EXL S1 or mid-range NXC to your load, efficiency goals, and redundancy target.
Learn moreInstallation and Commissioning
Installation, integration, and commissioning prove the system before it protects your critical load.
Learn moreMaintenance and Battery Service
Preventative maintenance and battery service keep the EXL S1 and NXC efficient and reliable.
Learn moreEfficiency Across the Range
From Mid-Range to Large, Built for Uptime
The NXC delivers transformer-free, high-efficiency three-phase protection for mid-size data centers and facilities, while the large EXL S1 uses Dynamic Online mode to reach top efficiency at 250 to 1200 kVA.
Together they cover a broad capacity range with the reliability data centers require. Comp-Utility helps you select and deploy the right platform for your load.
Key Specifications
| Attribute | Liebert EXL S1 | Liebert NXC |
|---|---|---|
| Topology | Online, large | Online, transformer-free |
| Power rating | 250 to 1200 kVA | 30 to 200 kVA |
| Voltage / phase | 480V, three-phase | 400V, three-phase |
| Efficiency | Dynamic Online, very high efficiency | High efficiency, integrated controls |
| Batteries | VRLA or lithium-ion | VRLA |
| Typical applications | Large data centers, mission-critical | Mid data centers, facilities |
Specifications reflect the Liebert EXL S1 and NXC product lines; exact ratings and configuration vary by model. Contact us to confirm the current configuration for your project.
The Comp-Utility Difference
Why Comp-Utility?
Long-Standing Distribution Partner
As a long-standing distribution partner of Eaton, Schneider Electric, and Vertiv, we specify best-in-class systems and back them with factory-grade service.
Engineer-Owned and Operated
Comp-Utility is owned and operated by engineers, with licensed Texas Professional Engineers (P.E.) on staff. That rigor anchors every design, specification, and installation.
Turnkey, Single-Contract Partner
We sell, design, install, and maintain complete infrastructure end to end. One accountable team and one contract for power, cooling, distribution, and cabling.
24/7 Emergency Response and Preventative Maintenance
Our technicians provide preventative maintenance programs and 24/7 emergency response, with rapid on-site dispatch across Central Texas when facilities need us most.
Licensed, Certified & Recognized
We hold ourselves to the standards of the institutions we serve, from professional licensure and jobsite safety to the industry organizations that set the bar for mission-critical work.
Licensed Professional Engineers
State of Texas (TBPE)
OSHA 30 Certified
Field Technicians
AFCOM Member
Data center industry association
7x24 Exchange Member
Mission-critical infrastructure
Frequently Asked Questions
What is the Vertiv Liebert EXL S1?
The Liebert EXL S1 is a large three-phase UPS spanning roughly 250 to 1200 kVA for large data centers and mission-critical facilities. Its Dynamic Online mode delivers very high efficiency while protecting the load, and it supports paralleling and lithium-ion options for capacity, redundancy, and lower total cost of ownership.
What is the Liebert NXC?
The Liebert NXC is a transformer-free online three-phase UPS spanning about 30 to 200 kVA, suited to mid-size data centers and critical facilities. It offers high efficiency and integrated controls in a compact footprint, providing dependable three-phase protection where a large modular system is not required.
How do I choose between the EXL S1 and NXC?
Choose the NXC for mid-range loads around 30 to 200 kVA where a compact, efficient unit fits, and the EXL S1 for large loads from 250 to 1200 kVA needing top efficiency and paralleling. Comp-Utility's engineers compare both against your capacity, efficiency goals, and growth plans to recommend the right platform.
What is Dynamic Online mode?
Dynamic Online is Vertiv's high-efficiency operating mode that minimizes conversion losses while monitoring power quality and reverting to full double conversion when needed. On the EXL S1 it enables very high efficiency at large capacities, reducing energy and cooling cost without compromising protection of the critical load.
Do these systems support lithium-ion batteries?
The EXL S1 supports VRLA and lithium-ion batteries, with lithium-ion offering longer life and a smaller footprint for large deployments. The NXC is commonly deployed with VRLA. Comp-Utility specifies the appropriate battery chemistry and runtime for your facility and can advise on lithium-ion where it lowers total cost of ownership.
Can the EXL S1 be paralleled for redundancy?
Yes. The EXL S1 supports paralleling for added capacity and system-level redundancy up to 2N. Comp-Utility designs the redundancy architecture to meet your tier and uptime targets and validates it through commissioning before the system carries the critical load.
Who installs and services the EXL S1 and NXC in Central Texas?
Comp-Utility, a long-standing Vertiv distribution partner, specs, installs, commissions, and maintains the Liebert EXL S1 and NXC across Central Texas, including battery service and 24/7 emergency response. Call (512) 346-0999 or email sales@comp-utility.com.
What maintenance do these UPS systems require?
They require periodic battery testing, capacitor and fan replacement at end of life, connection and firmware checks, thermal scanning, and verification of operating modes and redundancy. A documented preventative maintenance program keeps the warranty valid and prevents downtime from wear items. Comp-Utility tailors the cadence to your load criticality.
My UPS is in alarm, what do I do?
Call Comp-Utility right away at (512) 346-0999, and have the unit's model and serial number ready along with any alarm codes or messages shown on the UPS display. A unit in alarm can indicate a battery, load, or power-path issue that needs prompt attention. Because we maintain a large base of units under contract with the major UPS manufacturers, we can escalate directly to the right factory resources and coordinate service faster and more directly than a single end user calling general support, often getting you answers and a technician on site sooner.