Vertiv EBU Series External Battery Units

Technical Dossier

Product Details And Specifications

Vertiv EBU Series: Comprehensive Module Range and Technical Overview

The Vertiv EBU (External Battery Unit) Series is a purpose-engineered line of external battery enclosures and modules designed to extend the runtime of Vertiv (formerly Emerson Network Power / Liebert) UPS systems deployed in mission-critical industrial and commercial environments. EBU Series units are installed across global heavy industry sectors including petrochemical refineries, nuclear power auxiliary systems, offshore platforms, pharmaceutical manufacturing, and large-scale data center infrastructure. Their standardized battery bus architecture allows direct integration with Vertiv GXT, Liebert GXT4, APM, EXL, and NXL UPS platforms without additional power conversion hardware.

In facilities where unplanned downtime carries regulatory or safety consequences — such as ATEX-classified zones or IEC 61511 SIL-rated process control loops — EBU Series units provide the extended autonomy required to execute controlled shutdowns or bridge to generator transfer. The series is characterized by hot-swap battery string capability, front-access maintenance design, and compatibility with both VRLA (Valve-Regulated Lead-Acid) and select lithium-ion battery configurations in later revisions.

The Evolution of EBU Series Architecture

The EBU product line originated under the Emerson Network Power brand in the early 2000s as a companion enclosure to the Liebert GXT2 and GXT3 UPS families. Early units — including the EBU01 and EBU02 — used a passive battery bus topology with no onboard intelligence; battery status was monitored entirely through the parent UPS communication bus.

With the transition to the GXT4 platform (circa 2013–2016), Vertiv introduced enhanced EBU variants with embedded battery management circuitry, enabling per-string voltage monitoring and thermal runaway detection independent of the host UPS. This architectural shift addressed a key failure mode in earlier units where a degraded battery string could go undetected until a load event.

Following Emerson's divestiture of its Network Power division and the formation of Vertiv in 2016, the EBU product line was rationalized. Several legacy SKUs (EBU01, EBU02, EBU480) were officially discontinued and transitioned to end-of-life (EOL) status, while newer form factors (EBU-72V, EBU-96V) were introduced to support the Vertiv Liebert GXT5 and APM product lines. Facilities running legacy GXT2/GXT3 infrastructure must source EBU01 and related units through authorized aftermarket channels, as OEM production has ceased.

Compatibility note: EBU Series units are voltage-matched to specific UPS DC bus configurations. Cross-series substitution without engineering validation is not supported and may void UPS warranty or compromise protection coordination.

EBU Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented EBU Series product range. Units are classified by function and generation. EOL status is noted where applicable.

External Battery Enclosures — Legacy Generation (GXT2 / GXT3 Compatible)

• EBU01: External battery unit, 1000–3000VA GXT2/GXT3 compatible, 36V DC bus, VRLA, 2U rackmount, EOL
• EBU02: Extended runtime battery module, 5000–10000VA GXT2/GXT3, 72V DC bus, VRLA, 3U rackmount, EOL
• EBU03: High-capacity external battery enclosure, 10–20kVA GXT3, 192V DC bus, front-access, EOL
• EBU480: 480V-class external battery string assembly, large UPS systems, modular cabinet format, EOL
• EBU-GXT3-6000RT3U: Matched battery unit for GXT3-6000RT3U, 72V, 3U, VRLA, EOL

External Battery Enclosures — Current Generation (GXT4 / GXT5 Compatible)

• EBU-72V: 72V external battery unit, GXT4/GXT5 compatible, embedded BMS, 2U rackmount, active
• EBU-96V: 96V external battery unit, GXT5 extended runtime, embedded BMS, 2U rackmount, active
• EBU-192V: 192V external battery string, GXT4 10–20kVA, modular, active
• EBU-240V: 240V battery extension module, APM series, cabinet-mount, active
• EBUCAB12: 12-battery external cabinet, scalable string configuration, floor-standing, active
• EBUCAB18: 18-battery external cabinet, high-autonomy configuration, floor-standing, active

Battery Management & Ancillary Modules

• EBU-BMS01: Standalone battery management module, retrofit for legacy EBU enclosures, per-string monitoring
• EBU-TEMP01: Thermal sensor array, mounts inside EBU cabinet, interfaces with GXT4 SNMP card
• EBU-FUSE-KIT: Replacement fuse assembly kit, compatible with EBU01/EBU02/EBU03 enclosures
• EBU-CABLE-36V: DC interconnect cable set, 36V bus, EBU01 to GXT2/GXT3 UPS, 1.5m and 3m variants
• EBU-CABLE-72V: DC interconnect cable set, 72V bus, EBU02/EBU-72V to GXT3/GXT4 UPS
• EBU-RAIL-KIT: Rack rail mounting kit, universal 19-inch, compatible with EBU01/EBU02/EBU-72V/EBU-96V

Sourcing Hard-to-Find & Obsolete EBU Series Parts

The EBU01, EBU02, EBU03, and EBU480 have been discontinued by Vertiv. OEM replacement stock is no longer available through standard distribution channels. Facilities operating legacy GXT2 and GXT3 UPS infrastructure — particularly those with 10+ year maintenance cycles common in nuclear auxiliary power, petrochemical DCS backup, and legacy SCADA power conditioning — require aftermarket sourcing to maintain runtime specifications without full UPS replacement.

DriveKNMS maintains a dedicated inventory of legacy EBU Series units sourced through controlled decommissioning projects, authorized reseller networks, and factory-surplus channels. Each unit is cataloged by DC bus voltage, battery string configuration, and physical condition grade (Grade A: tested functional; Grade B: cosmetic wear, full electrical function; Grade C: for parts/repair).

For facilities requiring long-term maintenance agreements (LTMAs) on EBU Series infrastructure, DriveKNMS provides multi-year supply commitments with guaranteed unit availability windows. This is particularly relevant for sites where capital expenditure approval cycles for full UPS replacement extend 3–5 years beyond OEM EOL dates.

Quality Control for the EBU Series Range

EBU Series units present specific test challenges due to their passive or semi-active battery bus architecture and the absence of onboard display interfaces on legacy models. DriveKNMS applies the following test protocol to all EBU Series units prior to dispatch:

• DC Bus Voltage Verification: Full-string open-circuit voltage measurement against nominal specification (36V / 72V / 192V / 240V depending on model). Deviation >2% triggers battery string replacement or unit rejection.
• Internal Resistance Testing: Per-cell impedance measurement using Hioki BT3554 or equivalent. Cells exceeding 150% of reference impedance are flagged for replacement.
• Load Discharge Test: Controlled discharge at 50% rated load for minimum 10 minutes. Runtime is logged and compared against OEM specification for the battery age and chemistry.
• Thermal Imaging: Infrared scan of battery terminals, bus bars, and fuse assemblies under load to identify hot spots indicative of high-resistance connections or failing cells.
• Enclosure & Connector Inspection: Physical inspection of DC output connectors, cable insulation, rack ears, and front-panel indicators. Corroded or deformed connectors are replaced before dispatch.
• Compatibility Verification: DC bus voltage and connector type are cross-referenced against the customer's specified UPS model to confirm interoperability before shipment.

Test records are retained for 24 months and are available to customers upon request for maintenance documentation purposes.