The BigBattery ETHOS™ + EG4 12000XP ESS System is a powerful, scalable energy solution designed for both on-grid and off-grid applications. Combining the modular ETHOS 48V LiFePO? battery system with the high-performance EG4 12000XP hybrid inverter, this system delivers reliable, efficient energy for homes, cabins, and homesteads.
The EG4 12000XP provides up to 12,000W split-phase output with up to 24,000W PV input and dual MPPTs, enabling strong solar production and seamless power management between solar, battery, and grid. Paired with the ETHOS battery system – expandable up to 80+ kWh – this setup ensures long-lasting, maintenance-free energy storage with consistent performance.
Built with advanced battery management, and U.S.-engineered design, this system delivers safe, intelligent energy control with closed-loop communication and real-time monitoring. Ideal for backup power, energy savings, and full off-grid independence.
- Ships From: Texas, USA
- Warranty: 12 Years (Battery), 5 Years (Inverter)
- Support: Lifetime USA-Based Tech Support
CompatibilityIntegrated & Optimized System
- ETHOS Battery System + EG4 12000XP Hybrid Inverter
Expandable & Flexible - Scalable ETHOS battery capacity up to 80+ kWh
- Compatible with additional ETHOS modules for future expansion
- Supports grid-tied, hybrid, and off-grid installations
- Key Features
- Complete ESS Solution – Battery + inverter system designed to work seamlessly together
- 12,000W Split-Phase Output – Reliable power for residential and off-grid applications
- 24,000W PV Input – High solar capacity with dual MPPT optimization
- LiFePO? Battery Chemistry – Safe, stable lithium technology with long lifespan
- 6,000+ Cycle Life – Built for years of daily use and long-term savings
- Closed-Loop Communication – Optimized coordination between battery and inverter
- Advanced BMS Protection – Multi-layer protection for safe and reliable operation
- Modular Expansion – Easily scale storage capacity as energy needs grow
- UPS Backup (15-30ms) – Seamless transition during outages
- Smart Energy Management – Supports load control, AC coupling, and peak shaving
- Remote Monitoring & Control – Real-time system tracking and performance insights
- Maintenance-Free Operation – No routine servicing required
A flexible, high-performance energy storage system built for reliability, scalability, and long-term energy independence.Battery Specifications - 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
- Cell Configuration: 16S 2P
- 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)
- Dimensions (D×W×H): 6.7 in × 26.5 in × 43.3 in
- Max Connections: Up to (16) parallel connections per control box
- Protection Rating: IP65 / NEMA 4X
- Communications: CANBus / RS485
- Certifications: UL9540A, UL1973, & UN38.3"
Inverter Specifications - Nominal AC Voltage: 120/240VAC | 120/208VAC (L1/L2/N required)
- Frequency (Grid | Generator): 60 Hz (Default) | 50 Hz (Configurable)
- Max Continuous AC Current (Grid | Generator): 100A @ 240VAC | 62.5A @ 240VAC
- Max AC Input Power: 24000W
- AC Bypass (Grid | Generator): 100A | 90A
- Recommended Generator Capacity: 6000W – 15000W
- Output Voltage: 120/240VAC | 208VAC
- Output Frequency: 60 Hz (Default) | 50 Hz (Configurable)
- Max Continuous Output Current: 50A @ 240VAC | 57.7A @ 208VAC
- Nominal Output Power (without PV): 12000W @ 240V | 12000W @ 208V
- Nominal Output Power (with PV): 12000W @ 240V | 12000W @ 208V
- Max Continuous Wattage: 12000W (L1/L2) | 6000W (L1-N/L2-N)
- Surge Capacity: 18000W (5 sec) | 15000W (10 sec)
- Power Factor: 0.99
- Total Harmonic Distortion: <3%
- Switching Time: <10 ms (Single) | <20 ms (Parallel)
- No. of MPPTs (Inputs per MPPT): 2 (2)
- Max Input Current: 35A / 35A
- Max Short Circuit Input Current: 44A / 44A
- DC Input Voltage Range: 100 – 480VDC
- Min Start Up Voltage: 100VDC
- MPPT Operating Voltage Range: 120 – 385VDC
- Nominal MPPT Voltage: 320VDC
- Max Utilized PV Power: 24000W (12000W per MPPT)
- Max Recommended PV Input: 28000W (14000W per MPPT)
- Efficiency: 99% (MPPT) | 93.5% (PV to Loads) | 92.8% (PV to Battery) | 92.5% (AC to Battery) | 90.2% (Battery to Loads)
- Idle Consumption (Standby Mode): <70W
- Nominal Voltage: 48VDC
- Battery Voltage Range: 46.4 – 60VDC
- Max Charge / Discharge Current: 250A
- Max Charge / Discharge Power: 12000W
- DC Cut-Off Voltage: 59VDC
- Recommended Battery Capacity per Inverter: >400Ah
- Max Parallel Connections: 6
- Protection Rating: IP20
- Communication Interface: RS485 / CANBus / WiFi
- Operating Temperature (Full Load): 32ºF – 113ºF (0ºC – 45ºC)
- Storage Temperature: 5ºF – 140ºF (-15ºC – 60ºC)
- Altitude: <6,561 ft (2000 m)
- Relative Humidity: 5 – 95% (Non-Condensing)
- Typical Noise Emission: <60 dB
- Cooling Method: Fan
- Weight: 104.7 lbs (47.5 kg)
- Depth: 5.9 in (150 mm)
- Width: 20.9 in (530 mm)
- Height: 34.25 in (870 mm)
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