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EG4
EG4 WallMount 314Ah All-Weather Battery + FLEXBOSS21
EG4 WallMount 314Ah All-Weather Battery + FLEXBOSS21
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EG4 WallMount 314Ah All-Weather Battery + FLEXBOSS21
Product Summary:
The EG4 314Ah All-Weather Battery + EG4 FlexBOSS21 ESS System delivers maximum capacity, rugged durability, and advanced hybrid power control for both on-grid and off-grid applications. Combining the 16kWh EG4 WallMount All-Weather LiFePO₄ battery with the high-performance FlexBOSS21 hybrid inverter, this system provides scalable, reliable energy for residential and light commercial installations.
The FlexBOSS21 delivers 16kW output and up to 21,000W PV input with 3 MPPTs, maximizing solar production and system flexibility. 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 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 314Ah All-Weather Battery + EG4 FlexBOSS21 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
- 21,000W PV Input / 12kW Output – High-capacity power for residential and commercial systems
- 3 MPPT Inputs – Maximizes solar production across multiple arrays
- 16kWh LiFePO₄ 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 high-capacity, outdoor-ready energy storage system built for durability, intelligent control, and long-term energy independence.
Meet the EG4 WallMount 314Ah AllWeather Battery — a high-capacity, outdoor-ready energy storage unit built for installs where space, weather, and long runtimes all matter. Delivering 16kWh at 51.2V, it’s designed to be a dependable backbone for solar-plus-storage, off-grid power, or whole-home backup setups that need serious capacity with straightforward expandability.
At the core are lithium iron phosphate (LiFePO₄) cells paired with EG4’s smart BMS for stable performance and long service life, plus active cell balancing to help keep the pack operating efficiently over time. The enclosure is purpose-built for exterior placements with an IP67 rating, and internal heaters support reliable operation when temperatures drop. For day-to-day ownership and long-term maintenance, Bluetooth + Wi-Fi connectivity enables live status checks and over-the-air firmware updates through the EG4 app—so the system stays current without hassle.
Why it stands out
- Big usable capacity: 16kWh (314Ah) for extended runtime and stronger backup coverage
- True outdoor protection: IP67 enclosure built to handle dust, water, and harsh conditions
- Smarter control: EG4 smart BMS with active cell balancing for better efficiency and longevity
- Connected ownership: Bluetooth/Wi-Fi monitoring + OTA updates via the EG4 app
- Cold-weather confidence: Built-in heaters for reliable performance in colder climates
- Simplified scaling: Auto-addressing and closed-loop integration with EG4 inverters/batteries
Best-fit applications
A strong choice for residential and light commercial solar storage, outdoor battery banks, off-grid power systems, and backup power where durability, monitoring, and easy expansion are priorities.
Core specifications (at a glance)
Weight: 309 lbs
Nominal Voltage: 51.2V
Energy Capacity: 16kWh
Charge Capacity: 314Ah
Max Parallel (closed-loop): Up to 32 batteries
Certifications: UL 1973; UL 9540 with Flexboss21 & Flexboss18
Design Life: Tested 10,000+ cycles @ 80% DoD
Dimensions: 34.6″ × 21.7″ × 9.3″
Downloads & Specifications
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: 309lbs. (140 kg)
Enclosure Rating: IP67
Mounting Options: Wall attached /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
15000W (6 min) | 13200W (12 min)
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Items Included-Quantity depends on Your ESS Configuration
Why it stands out
Best-fit applications
Core specifications (at a glance)
