The EG4 314Ah All-Weather Battery + EG4 FlexBOSS18 ESS System delivers rugged, high-capacity energy storage with advanced hybrid power control for both on-grid and off-grid applications. Combining the 16kWh EG4 WallMount All-Weather LiFePO? battery with the powerful FlexBOSS18 hybrid inverter, this system provides reliable, scalable energy for residential and light commercial installations where durability and performance matter most.
The FlexBOSS18 supports up to 18,000W PV input with dual MPPTs and 120/240V split-phase output, enabling flexible system design and strong solar performance. Paired with the EG4 314Ah All-Weather battery – featuring 200A continuous output, 8,000+ cycle life, and a smart BMS with active cell balancing – this system ensures stable, efficient energy delivery over the long term.
Designed withUL 9540 certified configurations, advanced battery management, andU.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
CompatibilityIntegrated & Optimized System - EG4 314Ah All-Weather Battery + EG4 FlexBOSS18 Hybrid Inverter
Expandable & Flexible - Cross-compatible with other EG4 battery systems
- Scalable energy storage for growing system needs
- Supports grid-tied, hybrid, and off-grid installations
- 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
- 16kWh LiFePO? Battery (314Ah) – High-capacity, durable energy storage
- 200A Continuous Output (~9.6kW) – Supports whole-home and critical loads
- IP67 Outdoor-Rated Design – Built to withstand dust, water, and harsh environments
- 8,000+ Cycle Life – Long-lasting performance at 80% DoD
- Advanced Smart BMS – Active cell balancing for improved efficiency and lifespan
- Self-Heating Function – Reliable operation in cold climates
- Bluetooth & Wi-Fi Monitoring – Real-time tracking and OTA firmware updates
- Closed-Loop Communication – Seamless coordination between battery and inverter
- GridBOSS Integration – Advanced load management, AC coupling, and generator support
- Maintenance-Free Operation – No routine servicing required
A rugged, high-capacity energy storage system built for outdoor durability, intelligent control, and long-term energy independence.Battery Specifications - Product Type: LFP Battery
- Battery Type: Lithium Iron Phosphate (LFP)
- Model Number: WM48314AWXX (XX is a number between 00 – 99)
- Nominal Energy Capacity: 16kWh
- Usable Energy (DOD%): 12.86kWh (80% recommended)
- Voltage Range: 47.5 – 57.6 VDC
- Nominal Voltage: 51.2 VDC
- Capacity: 314Ah
- Charging Voltage Range: 56 – 57 VDC
- Discharging Cut-off Voltage: 47.5 VDC
- Max Continuous Charge Current: 157A
- Max Continuous Discharge Current: 200A
- Continuous Charge/Discharge Power: 8/10.2 kW
- Recommended Charging/Discharging Rate: 0.5C
- Peak Power: 12.8kW (3 sec)
- Round-trip Efficiency: 95%
- Max Parallel Units: 32
- Protection Features: Over/Under Voltage, Over-Current, Short Circuit, High/Low Temp
- Battery Management System (BMS): Integrated, Active Balancing
- Communication Protocols: RS485, CAN
- Battery Breaker: 250A
- Storage Temperature Range**: -4 – 131°F (-20 – 55°C)
- Humidity Range: 5% – 95% RH (non-condensing)
- Altitude: 9843 ft. (<3000 m)
- Cooling Method: Natural Convection
- Dimensions (H × W × D): 34.6 in. × 21.7 in. × 9.3 in. (880 mm × 550 mm × 235 mm)
- Operating Temperature Range: Charge: 32 – 122°F (0 – 50°C); Discharging: -4 – 131°F (-20 – 55°C)
- Recommended DOD Setting Note*: EG4 recommends this value be set no lower than 20% to maintain the recommended 80% Depth of Discharge.
- Storage Temperature Note**: Less than 3 months of storage. If longer than 3 months, recommended storage temperature will be 59°F – 86°F (15°C – 30°C).
- Weight: 309 lbs. (140 kg)
- Enclosure Rating: IP67
- Mounting Options: Wall attatched/Floor mount
- Display/Indicators: LED Status
- Connector Type: Degson quick connector/screw terminal
- UL 1973: Pending
- UL 9540: Pending
- UL 9540A: Pending
- UN 38.3: Pending
- Cycle Life (70% EOL Capacity): 10000 cycles @ 0.5C, 25°C, 80% DOD
- Design Life*: 15 years
- Warranty: 10 years or 10000 cycles
- Application Type: Residential/Commercial/Off-grid/Backup
- Lifetime Energy Throughput: 122.2MWh
- Note: Information subject to change without notice.
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: 1818000W
- 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)
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