Big Battery 48V ETHOS 15.3KWH (3 Module) - K0950
STACKABLE POWER STORAGE! BigBattery’s 48V ETHOS is here to revolutionize your home’s power. Our all new ETHOS battery system features a fully stackable and modular design, equipped with its own control box, in-depth LED display, and mounting system.
Whether you’re looking to ensure emergency backup power is available in your cabin or tiny home, or you’re looking to outfit your residential home with a powerful solar system, the ETHOS ensures reliable, efficient power delivery through every season. Equipped with an advanced BMS featuring an auto-cell balancing function, an IP65-rated casing, as well as an internal fire suppression system, the ETHOS ensures long-lasting safety and durability. Plus, with its interactive LED display and CANBus/RS485 communication protocols, you’re always able to monitor the health and status of your power. Each ETHOS module is certified to the highest level, including UL9540A & UL1973 certifications, and when paired with a 12000W LUXPower inverter, the whole system is UL9540-certified, affording you the ability to grid-tie your power system and capitalize on net-metering programs and other tax incentives.
The ETHOS is now available in 2-stack (10.24 kWh) and 3-stack (15.36 kWh) configurations, with the ability to expand upon your ETHOS system as needed. It’s time to take your home’s power to the next level! Shop the all-new 48V ETHOS today!
Included
- 3 × 48V ETHOS 5.12kWh Stackable Battery Module
- 1 × ETHOS Control Box
- 1 × 15kWh Ethos Controller to Battery Power Cable 4ft (1220mm)
What our Experts Think
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All‑round off‑grid powerhouse — Combines a 12 kW inverter with a 20.4 kWh LiFePO₄ battery bank, giving enough capacity and output to run most household loads or a small off‑grid home reliably.
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Large energy storage with strong output — 20.4 kWh capacity provides extended runtime, while the 12 kW inverter output handles heavy loads (appliances, tools, HVAC), making it versatile for homes, cabins, or remote installations.
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Ready for real-world demands — Solid battery chemistry and robust BMS ensure deep‑cycle durability and stable power delivery, even under demanding or fluctuating load conditions.
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Simplifies system design — As a packaged solution, it reduces complexity, wiring, and compatibility issues — a convenient way to deploy a complete off‑grid power system with minimal configuration.
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Scalable & future‑proof — The system can be expanded or paired with solar, generators, or additional modules, allowing users to grow their setup as needs evolve.
Q&A
Q: What is the BigBattery 12 kW 20.4 kWh ETHOS Off‑Grid Power System (K0710)?
A: A complete off-grid system combining a 48 V lithium battery bank with a 12 kW inverter, designed for whole-home, cabin, or backup solar + storage power without relying on the grid.
Q: What does “20.4 kWh” refer to?
A: The total usable energy storage capacity of the battery bank, providing extended off-grid operation or reliable backup during outages.
Q: What are the key design and safety features?
A: LiFePO₄ chemistry, IP65-rated weather-resistant enclosure, advanced BMS with cell balancing, and an integrated internal fire-suppression system for safety and long-term reliability.
Q: What kind of inverter and capabilities are included?
A: A split-phase 12 kW inverter supporting household AC loads, solar PV input via MPPT, seamless switching between solar/battery and grid or generator power, and compatibility with large PV arrays.
Q: What types of users or setups is this system best for?
A: Tiny homes, cabins, off-grid residences, remote homesteads, backup-power installations, and other structures needing robust solar + battery storage.
Q: What are the main benefits compared with simpler battery setups or lead-acid systems?
A: Higher usable energy, maintenance-free operation, safer LiFePO₄ chemistry, longer lifespan, compact modular design, and integrated off-grid or backup functionality.
Q: Is the system scalable or modular?
A: Yes, additional ETHOS battery modules can be added to expand storage capacity and increase backup duration.
Maintenance Tips
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Install the ETHOS system in a cool, dry, and well-ventilated area to ensure optimal performance and prevent overheating.
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Regularly inspect all wiring, terminals, and connections for looseness, corrosion, or damage to maintain safe off-grid operation.
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Keep the system exterior clean and dust-free using a soft, dry cloth to avoid heat buildup.
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Avoid exposure to direct sunlight, moisture, and extreme temperatures to preserve internal components.
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Monitor battery state of charge and avoid deep discharges to maintain long-term capacity and efficiency.
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During extended periods of non-use, keep the system at 50–60% charge and disconnect from all loads and power sources.
