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.
EG4 WallMount 314Ah All-Weather Battery + FLEXBOSS21 | UL9540 | Grid-Tied Home Solar System
Choose Your ESS Configuration*
1x Inverter
Standard
2x Inverter
Large
3x Inverter
3 Phase
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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
15000W (6 min) | 13200W (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
15000W (6 min) | 13200W (12 min)
EG4 WallMount 314Ah All-Weather Battery + FLEXBOSS21 | UL9540 | Grid-Tied Home Solar System