Ethos Parallel Comm Cable 4.9 ft (1500mm)
This is a communication cable for linking BigBattery Ethos units in a parallel battery bank. It carries data between battery controllers so the units can coordinate charge and discharge as one system. It does not carry power to your loads.
Check the Resources tab on this product page for wiring diagrams, manuals, and firmware notes before you install.
Why This Cable Matters
Parallel battery banks need a reliable communication link between units so the battery management systems (BMS) can talk to each other. Without a correct comm cable, paralleled Ethos batteries may fail to synchronize, throw errors, or refuse to charge/discharge together. This cable is purpose-built by BigBattery for Ethos-to-Ethos rack communication over a 4.9 ft (1500mm) run.
Battery Characteristics
This is not a battery — it is a comm/data cable accessory. It has no chemistry, voltage, or capacity rating of its own. It is designed specifically for BigBattery Ethos series batteries.
Wiring & Configuration Limits
Use this cable to link one Ethos unit to the next in a parallel stack, following BigBattery's documented parallel wiring sequence for Ethos systems. Length is fixed at 4.9 ft (1500mm) — it is not adjustable or extendable.
NOT compatible with: non-Ethos BigBattery product lines, other manufacturers' battery communication protocols, or use as a power/load cable. Do not substitute a generic RJ-style or network cable in its place — pinout and protocol are specific to Ethos hardware. [NEEDS VERIFICATION: exact connector type/pinout not provided in source data]
Pro-Installer Tip
Mismatched or missing comm cables are a common cause of "phantom" faults in parallel lithium banks — the packs read fine individually but the system won't balance or won't report a combined state of charge. This isn't a battery defect; it's a communication gap that lets cells drift out of balance across units over time, since each BMS is managing its own pack blind to the others. Before troubleshooting a paralleled Ethos bank, verify every comm cable is fully seated and confirm system-wide communication with BigBattery's supported monitoring app or a shunt-based battery monitor. Treat this check as part of standard commissioning — the same way you'd verify depth of discharge (DoD) limits (Lithium packs are typically run to 80–100% DoD) before putting a new bank into daily service.
Key Benefits
- Purpose-built for BigBattery Ethos parallel rack communication
- Fixed 4.9 ft (1500mm) length for standard rack-to-rack spacing
- Simplifies commissioning of multi-unit Ethos banks
Technical Table
| Spec | Value |
|---|---|
| Product Type | Parallel Communication Cable |
| Compatible System | BigBattery Ethos series |
| Length | 4.9 ft (1500mm) |
| SKU | CBL090-K |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Specifications are provided by the manufacturer and verified at time of listing. Always confirm compatibility with your specific system configuration before ordering.
Compatibility & Fitment
Compatible with BigBattery Ethos batteries configured in a parallel bank. Use one cable per link between adjacent units in the stack.
NOT included: Ethos battery units, mounting hardware, series connection busbars, or power cabling. NOT compatible with: non-Ethos BigBattery batteries or third-party lithium systems.
FAQ
Q: Can this cable be used to wire batteries in series?
A: No. This is a communication cable for parallel Ethos configurations, not a series power connector.
Q: Does this cable carry power between batteries?
A: No. It carries communication/data signals between Ethos battery management systems, not electrical current for charging or discharging.
Q: Will this work with other BigBattery product lines?
A: [NEEDS VERIFICATION] — source data confirms compatibility with the Ethos line only.
Q: Can I use a longer or shorter cable in place of this one?
A: [NEEDS VERIFICATION] — no alternate lengths are listed in the manufacturer data provided.
Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
Warranty & Support
Contact MSSD with your order number and system details if you have questions about compatibility before you order. We always reply back. For warranty terms on this accessory, ask us before you order — coverage details were not included in the manufacturer data provided.
