Vertiv PSI5-48VCBL6 48VDC EBC-to-UPS Extension Cable, 6ft / 1800mm
Overview
The Vertiv PSI5-48VCBL6 is a 6ft (1800mm) DC extension cable designed to connect a PSI5-48VBATT External Battery Cabinet (EBC) to a compatible Liebert PSI5 UPS, giving rack or room installers the flexibility to separate the battery enclosure from the UPS unit when direct side-by-side placement is not practical. Without this cable, the PSI5-48VBATT must terminate directly at the UPS chassis — a constraint that causes real problems in two-post racks, under-desk deployments, or any installation where the EBC needs to sit at a short distance from the main unit. The PSI5-48VCBL6 solves that with a purpose-matched 48VDC interconnect that preserves the factory electrical interface between cabinet and UPS.
This cable is the 6ft variant in the PSI5 48V extension cable family. The 1ft counterpart is the PSI5-48VCBL1 — use that when only minimal slack is needed. If your installation uses a PSI5-24VBATT or PSI5-72VBATT cabinet instead, different cable families apply: PSI5-24VCBL6 or PSI5-72VCBL6 respectively. Voltage matching matters — a 48V cable is not interchangeable with 24V or 72V variants.
Key Features
- 6ft / 1800mm Reach: Provides enough routing flexibility to span three to four rack units of separation — sufficient to run from a top-mounted UPS to a battery cabinet on a mid or lower shelf without forcing the enclosures to be physically adjacent. This is the single spec that determines whether your layout plan is executable.
- 48VDC System Match: Built specifically for the PSI5-48VBATT cabinet, which pairs with the PSI5-1500RT120 UPS (1500VA / 1350W). Using the correct voltage-rated cable is mandatory — mismatched cables are not recognized by the UPS BMS and will cause fault conditions.
- Purpose-Built Liebert PSI5 Interface: Terminated with the factory connector for the PSI5 EBC port, ensuring clean BMS communication between the UPS and the battery cabinet. A generic DC cable will not replicate this interface and will not be recognized by the UPS.
- Two-Length Family Choice: The PSI5-48VCBL6 (often searched as PSI5 48VCBL6) and the PSI5-48VCBL1 (1ft / 300mm) give you two placement options for the same 48V battery cabinet. If your rack layout allows direct adjacency, the 1ft cable reduces clutter; 6ft is the right pick any time the EBC must clear even a short gap from the UPS.
Integration and Compatibility
The PSI5-48VCBL6 is compatible with PSI5-48VBATT External Battery Cabinets, which extend runtime on the PSI5-1500RT120 UPS platform. It is not compatible with PSI5-24VBATT or PSI5-72VBATT cabinets — those require their own matched cable families (PSI5-24VCBL6 and PSI5-72VCBL6). Confirm your battery cabinet part number before ordering to ensure voltage and connector compatibility.
This cable does not apply to the PSI5-2200RT120, PSI5-3000RT120, or PSI5-5000RT208 platforms — those units use the 72V battery architecture and require the PSI5-72VCBL6 or PSI5-72VCBL1. For deployments where rack UPS systems anchor your power protection stack, confirming the complete EBC-to-UPS cable chain during the pre-installation phase prevents costly on-site troubleshooting. Review the full Vertiv Liebert PSI5 lineup for compatible UPS units and battery cabinets. If you are building a power-protected camera or network infrastructure rack, our UPS sizing and power protection guide covers EBC placement best practices. For switch-level power planning in the same rack, see PoE switch options that pair with PSI5-series UPS deployments.
Frequently Asked Questions
Q: Which UPS models is the PSI5-48VCBL6 compatible with?
A: The PSI5-48VCBL6 connects the PSI5-48VBATT External Battery Cabinet to the PSI5-1500RT120 UPS. It is not compatible with the 24V or 72V battery cabinet families, nor with the PSI5-2200RT120 or PSI5-3000RT120 platforms, which require the PSI5-72VCBL6.
Q: What is the cable length for the PSI5-48VCBL6?
A: The PSI5-48VCBL6 is 6ft (1800mm). The 1ft (300mm) variant for the same 48V battery cabinet is the PSI5-48VCBL1.
Q: Can I use the PSI5-48VCBL6 with a PSI5-72VBATT cabinet?
A: No. The PSI5-48VCBL6 is voltage-specific to the PSI5-48VBATT cabinet. For the PSI5-72VBATT cabinet — used with the PSI5-2200RT120, PSI5-3000RT120, and PSI5-5000RT208 UPS units — you need the PSI5-72VCBL6.
Q: Can a generic DC cable substitute for the PSI5-48VCBL6?
A: No. The PSI5 EBC interconnect uses a purpose-built connector that carries both power and BMS communication signals. A generic DC cable will not replicate the connector interface and will not be recognized by the UPS. Use only the manufacturer-specified cable for this connection.
Q: Does the PSI5-48VCBL6 work with TAA-compliant PSI5 UPS variants?
A: The PSI5-48VBATT cabinet and this cable serve the PSI5-1500RT120 UPS platform. The PSI5-1500RT120TAA is the TAA-compliant variant of that same platform. The battery cabinet and cable accessory are the same regardless of the TAA designation on the UPS.
The PSI5-48VCBL6 is one of those parts that gets overlooked during planning and becomes urgent on installation day. That 6ft / 1800mm length is the only confirmed measurement for this cable from the manufacturer, and it is the spec that decides whether your rack layout works. When an integrator is mounting a PSI5-1500RT120 UPS at the top of a rack and needs the PSI5-48VBATT EBC to sit two or three units below, this cable is what makes that arrangement possible.
Technical Highlights:
- 6ft / 1800mm Reach: Spans three to four rack units of vertical separation — enough for most single-rack layouts where the EBC sits below the UPS without forcing direct adjacency. The 1ft PSI5-48VCBL1 exists when you only need minimal slack.
- 48VDC Voltage-Specific Design: Matched to the PSI5-48VBATT cabinet, which serves the PSI5-1500RT120 UPS. This is not a universal cable — 24V and 72V cabinet families each have their own cable series, and substitution is not supported.
- Factory BMS Interface Connector: The PSI5 EBC port carries both power and battery management signals. A purpose-built termination is required for the UPS to recognize the cabinet — generic DC cables will not work in this role.
Deployment Considerations:
- Before ordering, measure the actual cable routing path in the rack — including vertical drops and any bends around cable managers. Six feet goes fast once you account for strain-relief loops and tidy routing.
- Verify your UPS model carefully: the PSI5-2200RT120 and PSI5-3000RT120 use the 72V battery architecture (PSI5-72VBATT), not the 48V cabinet this cable serves. Ordering the wrong voltage family cable is the most common mistake in PSI5 EBC deployments.
The PSI5-48VCBL6 is the right specification for any PSI5-1500RT120 installation where the battery cabinet cannot be mounted in the immediately adjacent rack unit — a scenario that comes up routinely in mixed-load racks and retrofits where UPS placement is constrained by existing equipment.
