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Add More Runtime To Your BigBattery ETHOS System Kit With Expanded Battery Storage For Longer Runtime, Energy Independence And Seamless System Growth
Give your BigBattery ETHOS Energy Storage System more capacity, longer runtime, and greater flexibility with the ETHOS Expansion Kit. Designed to integrate seamlessly with an existing ETHOS setup, this kit makes it easy to increase your stored energy so you can keep more essentials powered when the grid goes down or when your energy needs grow.
Whether you are preparing for longer outages, adding more loads to your backup plan, or simply want more usable energy on hand, the ETHOS Expansion Kit gives you a straightforward path to scale your system. The 2X configuration adds two additional ETHOS battery modules and expands total storage capacity to 10.24kWh, helping you run critical appliances, home systems, and everyday essentials for longer.
Built around the same stackable ETHOS battery platform, the expansion kit includes the battery modules, rack base, parallel power cables, and communication cable needed for system expansion. It is built for reliable performance, clean integration, and long-term peace of mind with BigBattery’s 12-Year Warranty.
If your current ETHOS system is working well but you want more stored energy available when it matters most, this expansion kit is the simple next step.
BigBattery ETHOS Expansion Kit Features
Expandable Battery Capacity So That You Can Store More Backup Power
The ETHOS 2X Expansion Kit adds two additional ETHOS battery modules to your existing system, expanding storage capacity to 10.24kWh. That means more stored energy available for outages, peak usage, or everyday backup needs.
Longer Runtime So That You Can Keep Essentials Powered for Longer
More battery capacity gives your ETHOS system the ability to support critical loads for a longer period of time. This is especially useful during extended outages when lights, refrigeration, communication devices, and other essentials need to stay online.
Seamless ETHOS Integration So That You Can Upgrade Without Starting Over
The expansion kit is designed to work with your existing ETHOS Energy Storage System. Instead of replacing your setup, you can build on the system you already have and increase capacity as your power needs grow.
Included Connection Hardware So That You Have the Key Components Needed to Expand
The kit includes the rack base, parallel power cables, and parallel communication cable needed for system expansion. This helps simplify the upgrade process by providing the core components required to connect the additional battery modules.
Stackable Battery Design So That You Can Save Space While Increasing Capacity
ETHOS battery modules are built in a stackable format, allowing you to add more storage without requiring a large installation footprint. It is a practical way to increase backup power while keeping your system organized.
Greater Energy Flexibility So That You Can Better Match Your Home’s Power Needs
Adding battery capacity gives you more flexibility in how you use stored energy. Whether you are preparing for longer outages or increasing the number of backed-up loads, the expansion kit helps your system better fit your real-world energy demands.
12-Year Warranty So That You Can Invest With Long-Term Confidence
The ETHOS Expansion Kit is backed by BigBattery’s 12-Year Warranty. That added protection helps give you peace of mind when expanding your home energy storage system.
BigBattery ETHOS Expansion Kit Warranty
BigBattery provides a 12-year warranty policy, ensuring the absence of defects in materials, workmanship, and performance during the warranty period.
2 × Ethos Parallel Power Cable 4.9 ft (1500mm) – CBL089
1 × Ethos Parallel Comm Cable 4.9 ft (150cm) – CBL096
BigBattery ETHOS 2X Expansion Kit Specifications
GTIN-12 (U.P.C.)
850061252173
System Voltage
48V
Nominal Voltage
51.2V
Chemistry
LiFePO4
kWh Capacity
10.24kWh
Ah Capacity
200Ah
Charging Voltage Range
55.6 – 57V
Max Charge Voltage
57V
Operating Voltage Range
48 – 57V
Suggested Low Voltage Cutoff
48 – 50.8V
BMS Cutoff Range
42 – 47V
Cell Configuration
16S2P
Max Continuous Discharge Current
200A
Max Continuous Power
10240W
Max Discharge Peak Current
300A (Max 5 seconds)
Max Charge Current
200A
Charge Temperature Range
32°F – 113°F (0°C – 45°C)
Discharge Temperature Range
-4°F – 140°F (-20°C – 60°C)
Optimal Discharge Temperature Range
59°F – 95°F (15°C – 35°C)
Storage Temperature Range
-4°F – 113°F (-20°C – 45°C) (Max 6 months)
Weight
273 lb (123.8 kg)
Depth
6.7 in (170 mm)
Width
26.5 in (674 mm)
Height
43.3 in (1100 mm)
Max Connections
Up to 16 parallel connections per control box
Protection Rating
IP65 / NEMA 4X
Communications
CANBus / RS485
Certifications
UL9540A, UL1973, & UN38.3
BigBattery ETHOS Expansion Kit Manual
Common Customer Questions
Get answers to the most frequently-asked questions customers ask before placing an order.
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Order Shipping Time Following processing, it may take between 3 and 8 days to arrive, depending on your location.
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