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BigBattery
EG4 280Ah All Weather + FLEXBOSS18 (ESS)
EG4 280Ah All Weather + FLEXBOSS18 (ESS)
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EG4 WallMount All Weather & EG4 FlexBOSS18 Hybrid Inverter (ESS) | 14.3–85.8kWh | UL9540 | Grid-Tied Home Solar System (18kW-54kW PV)
Product Summary:
The EG4 280Ah All-Weather Battery + EG4 FlexBOSS18 ESS System is a resilient, high-performance energy solution designed for both on-grid and off-grid applications. Combining the rugged 14.3kWh EG4 All-Weather LiFePO₄ battery with the powerful FlexBOSS18 hybrid inverter, this system delivers reliable, scalable, and intelligent energy management for residential and commercial use.
The FlexBOSS18 provides up to 18,000W PV input with dual MPPTs and 120/240V split-phase output, enabling flexible system design and strong performance. Paired with the durable All-Weather battery-featuring 200A continuous output, 8,000+ cycle life, integrated self-heating, and advanced safety protections – this system is built to perform in demanding environments.
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: 10 Years (Battery), 10 Years (Inverter)
Support: Lifetime USA-Based Tech Support
Compatibility
Integrated & Optimized System:
- EG4 280Ah All-Weather Battery + EG4 FlexBOSS18 Hybrid Inverter
Expandable & Flexible:
- Add additional batteries for increased storage capacity
- Supports grid-tied, hybrid, and off-grid installations
- Compatible with solar + generator input configurations
Key Features
- Complete ESS Solution – Battery + inverter system designed to work seamlessly together
- 18,000W PV Input – High solar capacity with dual MPPT optimization
- 120/240V Split-Phase Output – Reliable power for residential and commercial loads
- 14.3kWh LiFePO₄ Battery – Durable, high-capacity energy storage
- 200A Continuous Output – Supports high-demand appliances and critical systems
- 8,000+ Cycle Life – Long-lasting performance at 80% DoD
- All-Weather Design – Built for reliable indoor and outdoor operation
- Integrated Self-Heating – Reliable performance in cold climates
- Advanced BMS & Safety Protections – Includes EMP protection, fire safety features, and system safeguards
- Smart Energy Management – Supports load control, AC coupling, and generator integration
- Remote Monitoring & Alerts – Real-time system tracking and control
- Maintenance-Free Operation – No routine servicing required
A durable, flexible energy storage system built for resilience, performance, and long-term energy independence.
Items Included- Quantity depends on your ESS Configuration
Downloads & Specifications
Battery Specifications
Nominal Voltage:51.2V
Chemistry:Lithium Iron Phosphate (LiFePO4)
kWh Capacity:14.3kWh
Ah Capacity:280Ah
BMS Charging Voltage (Bulk/Absorb):56.0V (±0.8V)
Rec. Charging Voltage (Bulk/Absorb):56.2V (±0.2V)
Rec. Float Setting:54V (±0.2V)
Rec. SoC Cutoff Setting:20%
Max. Continuous Charge Current:140A
Max. Continuous Discharge Current:140A (200A Max. Continuous for 30 min)
Rec. Charge Current:60 – 140A
Rec. Discharge Current:60 – 140A
Max Continuous Discharge Rate:10,240W
Voltage:56V
Power Consumption:224W
Internal Temperature Cutoffs:≤32ºF (On) | ≥41ºF (Off)
Charging Temperature Range:32ºF – 122ºF (0ºC – 50ºC)
Discharging Temperature Range:-4ºF – 131ºF (-20ºC – 55ºC)
Storage Temperature Range:32ºF – 113ºF (0ºC – 45ºC)
Operating Altitude:<16,404 ft (<5,000 m)
Protection Rating:IP65
Communications:RS485 | CANBus
Weight:308.6 lbs (140 kg)
Depth:9.1 in (232 mm)
Width:22.3 in (566 mm)
Height:36.1 in (916 mm)
EG4 FlexBOSS18 Hybrid Inverter (ESS)
Inverter Specifications
Nominal AC Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Frequency:60 Hz (Default) | 50 Hz
Max. AC Current:54A @ 240V | 54A @ 208V
Max. AC Input Power:13000W
Max. AC Bypass:90A
Operating Voltage Range:180 – 270VAC
Output Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Max. Output Current:66.7A
Output Frequency:60 Hz (Default) | 50 Hz
Nominal Output Power (without PV):12000W @ 240V | 12000W @ 208V
Nominal Output Power (with PV):16000W @ 240V | 13800kW @ 208V
Power Factor:0.99 (Full Load)
Reactive Power Adjustment Range:-0.8 – 0.8 Leading Adjustable
Total Harmonic Distortion:<5% (Full Load)
Transfer Time:20ms (Default) | 10ms (Configurable) | 20ms (Parallel)
Rated Output Current:50A @ 240V | 57.7A @ 208V
Nominal Output Voltage:120/240VAC | 120/208VAC
Rated Output Power:12000W @ 240VAC | 12000W @ 208VAC
Peak Power:20000W (0.5 sec) | 15000W (1 sec)
12500W (6 min) | 11000W (12 min)
Operating Frequency:60 Hz (Default) | 50 Hz
Total Harmonic Distortion Voltage:<5%
No. of MPPTs:2
Inputs per MPPT:2 (MPPT 1) | 2 (MPPT 2)
Max. Usable Input Current:26A (MPPT 1) | 26A (MPPT 2)
Max. Short Circuit Input Current:31A (MPPT 1) | 31A (MPPT 2)
DC Input Voltage Range:100 – 600VDC
Unit Start-Up Voltage:200VDC
MPPT Operating Voltage Range:120 – 440VDC
Nominal MPPT Voltage:360VDC
Max. Utilized PV Array Power:18000W
Max. Recommended PV Input:18000W
Max. Efficiency:97.5% (PV to Grid) | 94.5% (PV to Battery) | 94% (Battery to Grid)
Idle Consumption:<65W
Nominal Voltage:48VDC
Voltage Range:40 – 60VDC
Max. Charge / Discharge Power:10000W
Recommended Battery Capacity per Inverter:>300Ah
Operating / Storage Temperature Range:-13ºF – 140ºF (-25ºC – 60ºC)
Operating Altitude:<6,561 ft (2000 m)
Relative Humidity:0 – 100%
Typical Noise Emission:<50dB @ 3 ft
Design Topology:High-Frequency / Transformerless
Protection Rating:IP65 / NEMA 4X
Communications:RS485 / CANBus / WiFi / 4G
Max. Parallel Connections:10
Weight:115 lbs (52 kg)
Depth:11.2 in (287 mm)
Width:22.8 in (567 mm)
Height:30.5 in (775 mm)
Battery Downloads
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Inverter Downloads
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Warranty
EG4 FlexBoss18 Inverter: 10-Year EG4 Manufacturer Warranty
EG4 All Weather Battery: 10-Year EG4 Manufacturer Warranty
