EG4 FlexBOSS21 All-In-One Hybrid Inverter 21kW PV Input 16kW AC Output - EG4INV240V50AFLXBOSSV2

EG4 FlexBOSS21 All-In-One Hybrid Inverter 21kW PV Input 16kW AC Output - EG4INV240V50AFLXBOSSV2The EG4 FlexBOSS21 is a 16kW, 120 240 VAC split phase, all in one, hybrid, sine wave inverter designed for the residential and small commercial markets. The FlexBOSS21 can utilize 21kW of DC (STC) solar PV on three MPPTs (26A 26A 15A) and can generate 12kW of power during non peak sunlight conditions and 16kW with solar PV gain when connected to the grid. It can bypass 90A of utility power from its grid port to its load port. The FlexBOSS21 is an

The EG4 FlexBOSS21 is a 16kW, 120/240 VAC split-phase, all-in-one, hybrid, sine wave inverter designed for the residential and small commercial markets. The FlexBOSS21 can utilize 21kW of DC (STC) solar PV on three MPPTs (26A/26A/15A) and can generate 12kW of power during non-peak sunlight conditions and 16kW with solar PV gain when connected to the grid. It can bypass 90A of utility power from its grid port to its load port.

 The FlexBOSS21 is an enhanced power-level cousin to EG4's flagship 18kPV inverter. Though it can perform as a standalone inverter, it has been designed to work optimally with EG4's GridBOSS power gateway, unlocking an even more robust feature-set and level of performance for the end user. Certified to UL 3141 and UL 1741, this inverter is EMP-hardened for reliable operation during Electromagnetic Pulse (EMP) events.

Key Features & Benefits

Industry-Leading Capacity: Highest PV input on the market (21kW usable, 24kW max) delivering 16kW AC output with PV and 12kW without.

Three Independent MPPTs (26A/26A/15A): Supports up to five strings with panels up to 13A, allowing flexible configurations across three orientations for optimal energy harvest.

EMP-Hardened: Ensures reliable operation during Electromagnetic Pulse (EMP) events, protecting critical electronics to ensure continued operation during natural or manmade disruptions.

Flexible Scalability: Expands easily from small to large systems, 50-160 Amps (equivalent to full 200A service). Supports up to 16 units in parallel for a total output of 256kW.

Powerful Performance: Starts a 5-ton AC unit easily. Provides 16kW continuous output with PV & battery, and 12kW continuous output using battery alone.

Comprehensive Certification Package: UL 3141 and UL 1741 certified with full compliance safety features including PV Arc Fault Protection, PV Ground Fault Protection, PV Reverse Polarity Protection, Surge Protection, Integrated PV Disconnect, built-in RSD transmitter, and RSD/ESS disconnect initiator.

Complete System Compatibility: Easily integrates with EG4's battery lineup and pairs perfectly with GridBOSS systems, supporting AC coupling, smart load management, and generator integration.

Remote Monitoring: Built-in Wi-Fi integrates with the EG4 app, enabling real-time monitoring of performance, battery status, and system settings, as well as remote firmware updates.

NEMA 4X Rated: Weather-resistant enclosure provides protection against corrosion, rain, and dust, making it suitable for outdoor installations.

10-Year Warranty: Backed by a 10-year warranty for long-term peace of mind.

Product Documents

• User Manual: Download User Manual
• Spec Sheet: Download Spec Sheet
• System Wiring Diagrams: Download Wiring Diagrams
• Battery Wiring Diagrams: Download Battery Wiring Diagrams