Product Summary:
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 LiFePO₄ 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 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 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 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 rugged, high-capacity energy storage system built for outdoor durability, intelligent control, and long-term energy independence.
EG4 WallMount 314Ah All-Weather Battery + FLEXBOSS18
Choose Your ESS Configuration*
1x Inverter
Standard
2x Inverter
Large
3x Inverter
3 Phase
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″
Battery Downloads
Battery Specifications
Inverter Downloads
DOWNLOADDOWNLOADDOWNLOAD
GO TO LINKInverter Specifications
12500W (6 min) | 11000W (12 min)
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″
Battery Downloads
Battery Specifications
Inverter Downloads
DOWNLOADDOWNLOADDOWNLOADGO TO LINKInverter Specifications
12500W (6 min) | 11000W (12 min)
