BigBattery ETHOS Expansion Kit

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. What's Included ETHOS 2x Expansion Kit 2 × 48V ETHOS 5.12kWh Stackable Battery Module – FETHS-48051-G1 1 × ETHOS RACK BASE – CNT081 2 × Ethos Parallel Power Cable 4.9 ft (1500mm) – CBL089 1 × Ethos Parallel Comm Cable 4.9 ft (150cm) – CBL096 ETHOS 3x Expansion Kit 3 × 48V ETHOS 5.12kWh Stackable Battery Module – FETHS-48051-G1 1 × ETHOS RACK BASE – CNT081 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