Big Battery EG4 FlexBOSS21 12kW (21kPV) Hybrid Inverter
The latest development from the EG4 team, the FlexBOSS21 is a cutting-edge, split-phase hybrid inverter designed to be the keystone of any residential or commercial power system. With an incredible 21kW PV input capacity and an array of advanced features,
The latest development from the EG4 team, the FlexBOSS21 is a cutting-edge, split-phase hybrid inverter designed to be the keystone of any residential or commercial power system. With an incredible 21kW PV input capacity and an array of advanced features, the FlexBOSS21 provides reliable performance day in and day out, in both on-grid and off-grid settings.
The FlexBOSS21 is one of the highest capacity inverters on the market today, featuring 3 MPPTs supporting up to 5 strings, providing superior flexibility for multi-orientation solar arrays, and the ability to handle 90A of grid feed-through at 120/240VAC, ensuring robust grid-tied capabilities. Plus, the FlexBOSS21 seamlessly integrates with EG4s GridBOSS MID power gateway for a cost-effective, streamlined setup, helping to reduce installation time and system startup costs, and when you pair these two units together in your system, youre able to utilize the smart load management, AC coupling, and generator support features if needed.
But thats not all. EG4 understands the value of enhanced safety and visibility when it comes to your power, and the FlexBOSS21 spares no expense, coming equipped with responsive rapid shutdown, ground fault monitoring, and arc fault protection, all backed by industry-leading safety certifications, and with EG4s updated monitoring software, you get access to remote management, mobile notifications, and convenient Wi-Fi connectivity for your system.
Combining efficiency, scalability, and cutting-edge technology, the FlexBOSS21 is a top-tier solution, with a safety-first design, for those seeking a reliable, powerful inverter to anchor their energy system. Whether for residential or commercial applications, its advanced features and versatile design provide unmatched value and peace of mind. Elevate your energy independence and power your future with the EG4 FlexBOSS21 Hybrid Inverter today!
Features
- 3 MPPT Inputs
- Remote Monitoring
- Smart Load Control
- AC Coupling Function
- Integrated UPS Module
- Built-In Circuit Breakers
- Seamless Switching In Under 20ms
- High-Frequency Split-Phase Output
- Advanced Parallelability up to 192kW
- Seamless Integration With GridBOSS MID
Suitable For
- 48V Battery Systems
- Residential Solar Systems
- AC Coupled UPS Systems
- Off-Grid Backup Systems
- Emergency Power Systems
- Commercial ESS
AC INPUT
| AC Voltage: | 120V AC / 240V AC |
| AC Frequency: | 60 Hz / 50 Hz |
| Max. Continuous AC Current: | 50A @ 240V AC |
| Max. AC Input Power: | 12000W |
| Max. AC Bypass: | 90A |
AC GRID OUTPUT
| Operating Voltage Range: | 180 – 270V AC |
| Output Voltage: | 120V AC / 240V AC |
| Max. Continuous Output Current: | 66.7A |
| Output Frequency: | 60 Hz / 50 Hz |
| Output Power (without PV): | 12000W @ 240V |
| Output Power (with PV): | 16000W @ 240V |
| Power Factor: | 0.99 (Full Load) |
| Reactive Power Adjustment Range: | -0.8 ~ 0.8 Leading Adjustable |
| Total Harmonic Distortion: | <5% (Full Load) |
| Transfer Time: | 10 – 20 ms (Single) / 20 ms (Parallel) |
AC BACKUP / UPS OUTPUT
| Max. Continuous Output Current: | 50A |
| Output Voltage: | 120V AC / 240V AC |
| Output Power: | 12000W @ 240V AC |
| Max. Output Power: | 24000W (0.5 sec) / 18000W (1 sec) 15000W (6 min) / 13200W (12 min) |
| Operating Frequency: | 60 Hz / 50 Hz |
| Total Harmonic Distortion Voltage: | <5% |
| Transfer Time: | 10 – 20 ms (Single) / 20 ms (Parallel) |
PV INPUT
| No. of MPPTs: | 3 |
| Inputs per MPPT: | 2 (MPPT 1 & 2) / 1 (MPPT 3) |
| Max. Input Current: | 26A (MPPT 1 & 2) / 15A (MPPT 3) |
| Max. Short Circuit Input Current: | 31A (MPPT 1 & 2) / 19A (MPPT 3) |
| DC Input Voltage Range: | 100 – 600V DC |
| Start Up Voltage: | 100V DC |
| MPPT Operating Voltage Range: | 120 – 440V DC |
| MPPT Voltage: | 360V DC |
| Max. Utilized PV Array Power: | 21000W |
| Max. PV Input: | 25000W |
| Max. Efficiency: | 94 – 97% |
| Idle Consumption: | <80W (Normal) / <60W (Standby Mode) |
BATTERY
| Nominal Voltage: | 48V DC |
| Voltage Range: | 40 – 60V DC |
| Max. Charge / Discharge Power: | 12000W |
| Recc. Battery Capacity per Inverter: | >300 Ah |
OPERATING ENVIRONMENT
| Operating / Storage Temperature Range: | -13F – 140F (-25C – 60C) |
| Altitude: | <6,561 ft (2000 m) |
| Relative Humidity: | 0 – 100% |
| Typical Noise Emission: | <50 dB @ 3 ft |
| Protection Rating: | IP65 / NEMA 4X |
| Communications: | RS485 / CANBus / WiFi |
| Max. Parallel Connections: | 16 |
DIMENSIONS
| Weight: | 88 lbs (40 kg) |
| Depth: | 11.3 in (287 mm) |
| Width: | 22.3 in (567 mm) |
| Height: | 30.5 in (775 mm) |
Spec Sheet
User Manual
UL1741 Certificate
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