The EG4 314Ah Indoor Battery + EG4 FlexBOSS21 ESS System delivers smart power, simple reliability, and scalable energy independence for both on-grid and off-grid applications. Combining the high-capacity 16kWh EG4 WallMount Indoor LiFePO? battery with the advanced FlexBOSS21 hybrid inverter, this system provides dependable whole-home backup and efficient energy management in a clean, space-saving design.
The FlexBOSS21 delivers 12kW output and up to 21,000W PV input with 3 MPPTs, maximizing solar production and system flexibility. Paired with the EG4 314Ah battery – featuring 200A continuous output, 8,000+ cycle life, and third-generation BMS technology – this system ensures stable, high-performance energy delivery for residential and small commercial use.
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 Indoor 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
- 16kWh LiFePO? Battery (314Ah) – High-density, safe lithium storage
- 200A Continuous Output / 12.8kW Peak – Powers heavy household loads and backup systems
- 8,000+ Cycle Life – Long-lasting performance at 80% DoD
- Advanced 3rd-Gen BMS – Improved monitoring, faster response, and precise balancing
- Auto-ID Technology – Simplifies installation and system configuration
- Self-Heating Function – Reliable performance in cold climates
- Closed-Loop Communication – Seamless coordination between battery and inverter
- GridBOSS Integration – Advanced load management, AC coupling, and generator support
- Wall or Floor Mount Design (IP20) – Flexible, space-saving indoor installation
- Maintenance-Free Operation – No routine servicing required
A high-capacity, intelligent energy storage system built for performance, flexibility, and long-term energy independence – with the reliability and control modern energy systems demand.Battery Specifications - Product Type: Low Voltage LFP Battery
- Battery Type: Lithium Iron Phosphate (LFP)
- Model Number: WM-48-314-IN-XX (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: 16
- 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): 34.1 in. × 18.1 in. × 9.6 in. (865 mm × 460 mm × 245 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: 293.2 lbs. (133 kg)
- Enclosure Rating: IP20
- Mounting Options: Wall/Floor mount
- Display/Indicators: LED Status
- Connector Type: Degson quick connector/screw terminal
- UL 1973: Yes
- UL 9540A: Batt to Batt spacing of 6 in.
- UN 38.3: Yes
- FCC Part 15 (EMC): Yes
- Protection Class: Class B
- Cycle Life (70% EOL Capacity): 10000 cycles @ 0.5C, 25°C, 80% DOD
- Design Life*: 10 years
- Warranty: 10 years or 10000 cycles
- Application Type: Residential/Commercial/Off-grid/Backup
- Lifetime Energy Throughput (Calculated): (51.2V×314Ah/1000×80%×10000/1000)90% = 115.7 MWh or (12861 kWh×10000 cycles×90% efficiency) = 115.7 MWh
- Note: Information subject to change without notice.
Inverter Specifications - Model: IV-16000-HYB-AW-FX-XX
- CEC Model #: IV-16000-HYB-AW-FX-XX {240V} | IV-16000-HYB-AW-FX-XX {208V}
- Type: Hybrid
- Design Topology: High Frequency – Transformerless
- Nominal Voltage: 120/240 or 208 VAC
- Frequency: 50/60 Hz
- Phase Support: 1ø
- Nominal Output Voltage: 120/240 VAC; 120/208 VAC (L1/L2/N required)
- Max. Continuous Output: 66.7 A | 16 kW
- Max. Continuous Output – Battery Only: 50 A | 6 kW
- Max. Continuous Output – With PV & Grid @25°C: 66.7 A | 16 kW
- Peak Power: 24,000 W (0.5 s) | 18,000 W (1 s) | 15,000 W (6 min) | 13,200 W (12 min)
- Locked Rotor Amps (LRA): 195 A
- Max. Continuous Output Per-Leg: 50 A | 6 kW
- Power Factor: 0.99 @ Full Load
- Max. Pass-Thru Current from Grid: 90 A
- Nominal Grid Voltage: 120/240 VAC | 120/208 VAC (L1/L2/N required)
- Max. Grid Input Power to Inverter (w/out Pass-Thru): 50 A | 12 kW
- Max. Grid Circuit Rating (w/ Pass-Thru): 90 A
- Nominal Voltage: 51.2 VDC
- Operating Voltage Range: 40 – 60 VDC
- Max. Charge Current (DC Amps): 250 A DC
- Max. Discharge Current (DC Amps): 250 A DC
- Battery Charge/Discharge Ripple Current: < 5%
- # of MPPTs: 3
- Rated Current per MPPT: 26 A (MPPT 1) | 26 A (MPPT 2) | 15 A (MPPT 3)
- Inputs per MPPT: 3 | 2 (MPPT 1) | 2 (MPPT 2) | 1 (MPPT 3)
- Short-Circuit Current Rating per MPPT: 31 A (MPPT 1) | 31 A (MPPT 2) | 19 A (MPPT 3)
- Max. DC Input Voltage*: 600 VDC
- MPPT DC Startup Voltage: 200 VDC
- MPPT Full Power Voltage Range**: 250 – 440 VDC
- MPPT DC Operating Voltage Range: 120 – 240 VDC
- MPPT Voltage High Protection***: 550 VDC
- Recommended Max. Solar Array Power (STC): 21 kW
- Transfer Time (Grid to Battery Switching Time): 20 ms (Default), 10 ms (Configurable)
- Open Loop Response Time (OLRT): < 2 s
- Time to Steady State: < 10 s
- CEC Weighted Efficiency: 97%
- Max. Efficiency: PV to Grid/Load: 97%
- Max. Efficiency: Battery to Grid/Load: 94%
- Max. Efficiency: PV to Battery: 94.5%
- Max. Efficiency: AC to Battery: 94%
- Idle Consumption (Standby Mode): < 65 W @ 25 °C
- Display: Optional EG4 FlexBOSS Screen Kit
- User Interface: App / Web
- Remote Connectivity: Wi-Fi, Cellular, and Ethernet (Wi-Fi dongle included by default)
- Operating Temperature Range: -13° – 140°F (-25° – 60°C)
- Storage Temperature Range: -13° – 140°F (-25° – 60°C)
- Operating Humidity: 0–95% relative humidity
- Max. Altitude of Operation: < 6,561 ft (< 2,000 m)
- Enclosure Rating: NEMA 4X
- Cooling Method: Fans
- Noise: < 50 dB @ 3 ft
- Dimensions (H × W × D): 30.43 × 22.28 × 11.22 in (773 × 566 × 285 mm)
- Unit Weight: 121 lbs (55 kg)
- Mounting: Wall mount
- Max # of Inverters in Parallel: 16 units
- Certifications: UL 1741, UL 1741 PCS CRD TEST, UL3141
- EMC Compliance: FCC Part 15 Class B
- Safety Class: Class I
- Environmental Protection: RoHS Compliant
- AC Input Breaker: 90 A
- AC Output Breaker: 80 A
- PV Input Breaker: 32 A per MPPT
- Battery Breaker: 250 A DC
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