The BigBattery ETHOS™ is a leader in both on-grid and off-grid solar installations, known for its quality, value, ease of installation, proven reliability and safety record. Expandable up to 80+ kWh, ETHOS adapts to your energy needs-perfect for home backup, off-grid, and hybrid systems.
Designed with UL 9540 certification, advanced battery management, and U.S.-engineered design, ETHOS delivers reliable, maintenance-free performance with seamless integration into leading inverter systems.
- Ships From: Texas, USA
- Warranty: 12 Years
- Support: Lifetime USA-Based Tech Support
CompatibilityUL 9540 Certified + Closed-Loop Communication (Grid-Tied) - EG4 18kPV
- EG4 FlexBoss18
- EG4 FlexBoss21
Closed-Loop Communication (Off Grid Non-UL 9540 Installs) - All BigBattery APEX Inverters
- All EG4 Inverters
Key Features - LiFePO4 Battery Chemistry – Safe, stable lithium technology with long lifespan
- 6,000+ Cycle Life – Built for years of daily use and long-term savings
- Advanced BMS Protection – Full protection against voltage, current, and temperature risks
- Outdoor-Ready Design – Built for durability in real-world environments along with indoor setup also
- Modular Expansion – Easily increase capacity without replacing your system
- Integrated Smart Control – Optimized performance with ETHOS controller
- Fast Installation – Simplified, plug-and-play modular setup
- Maintenance-Free – No routine servicing required
A future-ready battery platform built for energy independence-with the safety, support, and reliability you can trust.Battery Specifications - GTIN-12 (U.P.C.): 850061252005
- System Voltage: 48V
- Nominal Voltage: 51.2V
- Chemistry: LiFePO4
- kWh Capacity: 10.24kWh (2x), 15.36 kWh (3x), 20.48 kWh (4x), 30.72 kWh (6x), 40.96 kWh (8x), 46.08 kWh (9x)
- 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: 16S
- 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 (SoC >50%): -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: UL9540, UL9540A, UL1973, & UN38.3
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