BigBattery ETHOS Parallel Kit Includes:
- 2 × Ethos Parallel Power Cable 4.9 ft (1500mm)
- 1 × Ethos Parallel Comm Cable 4.9 ft (1500mm)
- 1 × ETHOS Rack Base
BigBattery ETHOS Parallel Kit — Multi-Battery Bank Connection Hardware
Scale Your Off-Grid Battery Bank with Confidence
- FREE System Design Consultation -- Our engineers verify compatibility with your ETHOS batteries before you buy
- FREE Shipping -- Ships free to your door, no freight surprises
- Compatibility Guarantee -- Pre-vetted to work with ETHOS parallel configurations
$254.95
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In the box
- 2 × Ethos Parallel Power Cable 4.9 ft (1500mm)
- 1 × Ethos Parallel Comm Cable 4.9 ft (1500mm)
- 1 × ETHOS Rack Base
Scale Your Off-Grid Battery Bank with Confidence
The BigBattery ETHOS Parallel Kit gives you the hardware to connect multiple ETHOS batteries into a single, larger bank. Two 4.9 ft parallel power cables handle the heavy current connections, while the 4.9 ft communication cable keeps your battery management systems talking to each other. The included ETHOS rack base provides a stable mounting point for your setup. Every component is field-tested for the demands of a grid-independent system — no piecing together random cables and hoping they work.
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Parallel Power Cables
Comm Cable Included
Rack Base Mount
Complete Connection Kit
4.9 ft
Cable Length
2
Power Cables
1
Rack Base
No Guesswork in Your Battery Bank Wiring
Buying random cables from different vendors and hoping they work together is how you end up with a battery bank that won't communicate, won't balance, or worse — overheats under load. The ETHOS Parallel Kit eliminates that risk. At Off Grid Vault, every component we carry is pre-vetted to work together, and this kit is purpose-built for ETHOS batteries. Two 4.9 ft power cables handle the parallel connection, the comm cable synchronizes BMS data across your entire bank, and the rack base provides a stable mounting foundation. No mix-and-match guesswork, no incompatible connectors, no wondering if your batteries are actually talking to each other.
Keep Every Battery in Your Bank Aligned
When you run multiple batteries in parallel, each cell needs to know what the others are doing. The included comm cable ensures your ETHOS batteries share state of charge, voltage, and temperature data across the entire bank. This isn't optional — without proper BMS communication, you get unbalanced charging, reduced capacity, and accelerated degradation. The 4.9 ft length gives you enough reach for standard rack configurations without excess cable clutter. Your battery bank performs as one unified system, not a collection of isolated cells guessing at each other's status.
Rack-Mount Stability for Grid-Independent Installations
Off-grid proven setups live in utility rooms, sheds, and dedicated power closets where vibration, temperature swings, and physical access are real concerns. The included ETHOS rack base gives your parallel battery bank a fixed, stable foundation. No stacking batteries on shelves, no worrying about connections working loose over time. This base is engineered specifically for ETHOS units, so the fit is exact and the support is distributed properly across the bank. For any grid-independent setup where your battery bank needs to stay put and stay connected for years, this is the hardware that makes it happen.
Compatibility Check
This parallel kit is designed for ETHOS battery systems. Verify your setup meets these conditions before ordering.
- Uses BigBattery ETHOS series batteries
- System supports parallel battery configuration
- Rack mounting space available for base unit
Where This Kit Fits
Built for expandable off-grid battery banks that need reliable parallel connections.
Homestead Power Banks
Cabin Solar Storage
Backup Battery Expansion
Full specifications
At a glance
- Power
- 4.9 ft (1500mm)
- Warranty
- See product page
Full specifications5 data points across 4 categories
Dimensions
| Power Cable Length | 4.9 ft (1500mm) |
|---|---|
| Comm Cable Length | 4.9 ft (1500mm) |
Power & Performance
| Configuration | Parallel |
|---|
Materials
| Components | See product page |
|---|
Compliance & Warranty
| Warranty | See product page |
|---|
The Off Grid Vault Promise
Every product we carry is vetted for real-world performance. If it doesn't meet our standards, it doesn't make the cut.
Free ShippingShips free to your door — no minimums, no thresholds, no fine print.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right. Uninstalled returns accepted within 30 days in original packaging.
Authorized DealerWe sell vetted products from trusted brands and handle warranty claims directly — no ticket queues.
★★★★★
“I was going to piece together cables for my ETHOS parallel setup until I found this kit. Everything connected cleanly — power cables, comm cable, rack base all matched perfectly. Both batteries synced immediately and my bank is showing as one unit on the inverter. No guessing, no mismatched connectors, no wasted time.”
Frequently Asked Questions
One undersized or incorrectly terminated cable can destroy a multi-thousand-dollar battery bank. This kit is purpose-built for ETHOS parallel connections — the power cables are rated for the actual current your bank will draw, the comm cable uses the correct protocol for BMS synchronization, and the rack base is engineered for ETHOS dimensions. Sourcing equivalents individually means researching specs, finding the right connectors, and hoping everything fits. At Off Grid Vault, we already verified the compatibility. The $254.95 protects a far larger investment.
Off Grid Vault is an authorized dealer, and every product we carry is vetted for build quality and real-world performance. This parallel kit is manufactured by BigBattery specifically for the ETHOS line — it is not a generic cable set repurposed for the job. The power connectors, comm protocol, and rack base dimensions match ETHOS specifications. If you have questions about your specific ETHOS model and configuration, our free system design consultation covers exact compatibility before you buy.
This kit is designed for the ETHOS battery line from BigBattery. For exact model compatibility — including whether your specific ETHOS capacity and revision use the same connector configuration — we recommend using our free system design consultation. Tell us which ETHOS batteries you have or plan to purchase, and we will confirm the fit before you order. This prevents the costly mistake of buying hardware that doesn't match your battery terminals or communication ports.
The specific gauge and amperage ratings are determined by BigBattery's engineering for ETHOS parallel applications. We do not invent specifications — if the exact gauge is not published in the manufacturer's documentation, we will not guess. What we can confirm: these are purpose-built ETHOS parallel power cables, not off-the-shelf wire with crimped terminals. For detailed electrical specifications, contact us through our free system design consultation and we will provide the manufacturer's published data directly.
This kit provides the inter-battery connections and rack base for ETHOS parallel configurations. You will still need the ETHOS batteries themselves, your inverter or charge controller, DC cabling from the battery bank to your bus bars or inverter, fusing or breakers appropriate for your bank's total capacity, and your solar panels or AC charging source. If you are building a complete system, our free system design consultation will map out every component you need — no missing parts, no incompatible hardware.
The 4.9 ft (1500mm) cable length is engineered by BigBattery for standard ETHOS rack configurations where batteries are mounted side by side. If your installation requires non-standard spacing — for example, batteries in separate enclosures or with additional equipment between them — you may need longer runs, which would require custom cabling outside this kit. For non-standard layouts, reach out to us through the free system design consultation and we will help you determine the correct cable lengths before purchasing.
The Off Grid Vault Promise
Every product we carry is vetted for real-world performance. If it doesn't meet our standards, it doesn't make the cut.
Free Shipping
Ships free to your door — no minimums, no thresholds, no fine print.
30-Day Performance Guarantee
If it doesn't perform as specified, we make it right. Uninstalled returns accepted within 30 days in original packaging.
Authorized Dealer
We sell vetted products from trusted brands and handle warranty claims directly — no ticket queues.
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About bigbattery battery kit
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