The BigBattery ETHOS™ + EG4 18kPV ESS System is a complete, high-performance energy solution designed for both on-grid and off-grid applications. Combining the scalable ETHOS 48V lithium battery system with the powerful EG4 18kPV hybrid inverter, this system delivers reliable, efficient, and intelligent energy management in one integrated package.
Expandable up to 80+ kWh, the ETHOS battery adapts to your energy needs-while the 18kPV inverter seamlessly manages power from solar, battery storage, and the grid. Ideal for home backup, energy savings, and full off-grid independence.
Designed with UL 9540 certified configurations, advanced battery management, and U.S.-engineered components, this system ensures safe, maintenance-free performance with seamless closed-loop communication between battery and inverter.
- Ships From: Texas, USA
- Warranty: 12 Years (Battery), 10 Years (Inverter)
- Support: Lifetime USA-Based Tech Support
CompatibilityIntegrated & Optimized System (UL 9540 Certified + Closed-Loop Communication) - ETHOS Battery System + EG4 18kPV Hybrid Inverter
Expandable & Flexible - Scalable ETHOS battery capacity up to 80+ kWh
- Compatible with additional ETHOS modules for future expansion
- Key Features
- All-in-One ESS Solution – Battery + inverter system designed to work seamlessly together
- 18kPV Hybrid Inverter Power – Supports solar, battery, and grid simultaneously
- 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
- Closed-Loop Communication – Optimized performance and real-time coordination between battery and inverter
- Modular Expansion – Easily increase storage capacity as your energy needs grow
- Fast Installation – Streamlined setup with integrated system design
- Maintenance-Free Operation – No routine servicing required
A complete, future-ready energy storage system built for independence, reliability, and long-term performance-with the safety, support, and engineering you can trust.Battery Specifications - GTIN-12 (U.P.C.): 850061252005
- 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: 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)
- 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
Inverter Specifications - AC Voltage: 120V AC / 240V AC
- AC Frequency: 50 Hz / 60 Hz
- Nominal Voltage: 51.2V
- Max. Continuous AC Current: 50A @ 240V AC
- Max. AC Input Power: 12000W
- Max. AC Bypass: 200A
- Operating Voltage Range: 180 – 270V AC
- Output Voltage: 120V AC / 240V AC
- Max. Continuous Output Current: 50A
- Output Power: 12000W
- BMS Cutoff Range: 42 – 47V
- Surge Capacity (with PV): 14700W (10 min) / 15500W (5 min)
- Surge Capacity (without PV): 13500W (10 min)
- Max. Continuous Line Wattage: 6000W
- Power Factor: 0.99 (Full Load)
- Reactive Power Adjustment Range: 0.8 ~ 0.8 Leading Adjustable
- Total Harmonic Distortion: <5% (Full Load)
- Transfer Time: 10 – 20 ms (Single) / 20 ms (Parallel)
- Max. Continuous Output Current: 50A
- AC Bypass (Generator): 90A
- Output Voltage: 120V AC / 240V AC
- Output Power: 12000W
- Max. Continuous Line Wattage: 8000W (per 120V)
- Operating Voltage Range: 180 – 270V AC
- Output Frequency: 50 Hz / 60 Hz
- Max. Output Power (with PV): 14700W (10 min) / 15500W (5 min)
- Max. Output Power (without PV): 13500W (10 min)
- Total Harmonic Distortion Voltage: <5%
- Switching Time: 10 ms
- No. of MPPTs: 3
- Inputs per MPPT: 2 (MPPT 1) / 1 (MPPT 2 & 3)
- Max. Input Current: 25A (MPPT 1) / 15A (MPPT 2 & 3)
- Max. Short Circuit Input Current: 31A (MPPT 1) / 19A (MPPT 2 & 3)
- DC Input Voltage Range: 100 – 600V DC
- Start Up Voltage: 100V DC
- MPPT Operating Voltage Range: 140 – 500V DC
- MPPT Voltage: 360V DC
- Max. PV Array Power: 18000W
- Max. Efficiency: 94 – 99.9%
- Idle Consumption: ~70W (Normal) / ~18W (Standby Mode)
- Nominal Voltage: 48V DC
- Voltage Range: 40 – 60V DC
- Max. Charge / Discharge Current: 250A
- Recc. Battery Capacity per Inverter: >200 Ah
- Operating / Storage Temperature Range: -13ºF – 140ºF (-25ºC – 60ºC)
- Altitude: <6,561 ft (2000 m)
- Relative Humidity: 0 – 100%
- Typical Noise Emission: 68 dB @ 3 ft
- Protection Rating: IP65 / NEMA 4X
- Communications: RS485 / CANBus / WiFi
- Max. Parallel Connections: 10
- Weight: 121 lbs (55 kg)
- Depth: 11.2 in (285 mm)
- Width: 20.5 in (520 mm)
- Height: 34.3 in (871 mm)
Battery DownloadsInverter Downloads- Spec Sheet | Download
- User Manual | Download
- UL9540 Certificate – BigBattery ETHOS + EG4 18kPv | Download
- UL1741 Certificate | Download
- UL 1741 CRD PCS Test Verification Of Conformity Security | Download
- Rapid Shut Down Wiring Guide | Download