The EG4 FlexBOSS21 is a high-performance 48V split-phase hybrid inverter/charger designed for advanced residential and commercial energy systems. Delivering the same dependable power as the 18kPV with greater system flexibility, the FlexBOSS21 is engineered to handle demanding loads while providing full control over solar generation, battery storage, and grid interaction.
With support for up to 21kW of PV input and the ability to start heavy loads such as a 5-ton air conditioning system, the FlexBOSS21 is built for serious energy applications. The inverter can be paralleled up to 16 units, delivering a combined 256kW of continuous output when using PV input, making it ideal for scalable energy storage systems.
Equipped with three independent MPPTs, users gain precise control over solar array design and performance optimization. Updated EG4 monitoring software enables full remote management, including mobile notifications and remote system configuration. When paired with GridBOSS, the FlexBOSS21 provides seamless control of the entire Energy Storage System (ESS).
Key Features
- 48V split-phase hybrid inverter and charger
- Supports off-grid, grid-assisted, and grid-export operation
- Up to 21kW solar PV input capacity
- High PV input voltage support up to 600V DC for reduced cable sizing
- Capable of starting high inrush loads, including 5-ton AC units
- Parallel support for up to 16 inverters
- Total system output up to 256kW continuous with PV input
- Three independent MPPTs for flexible solar array design
- Remote monitoring via Wi-Fi with mobile alerts and remote configuration
- Closed-loop communication with compatible battery systems
- Seamless integration with GridBOSS for full ESS control
Safety & Compliance
- Rapid shutdown capability
- Ground fault monitoring
- Arc-fault protection
- UL 1741 Certificate of Compliance
- CEC Solar Equipment Listing
System Compatibility
- Designed for use with 48V battery systems
- Compatible with EG4 energy storage solutions
- Closed-loop communication with supported batteries
- LCD Screen Kit available separately
Typical Applications
- Residential solar-plus-storage systems
- Light commercial and mixed-use installations
- Grid-tied systems with battery backup
- Off-grid and hybrid power systems
- Scalable ESS deployments
Why Choose the FlexBOSS21
The FlexBOSS21 delivers a powerful balance of performance, scalability, and intelligent control. Its high PV capacity, advanced monitoring, and comprehensive safety features make it a reliable solution for users seeking long-term energy independence and system flexibility.
What’s Included
- EG4 FlexBOSS21 Hybrid Inverter (V1.1)
- Integrated monitoring and communication hardware
LCD Screen Kit sold separately.
Your payment details are safe and secure. We accept the following:
The EG4 FlexBOSS21 is a high-performance 48V split-phase hybrid inverter/charger designed for advanced residential and commercial energy systems. Delivering the same dependable power as the 18kPV with greater system flexibility, the FlexBOSS21 is engineered to handle demanding loads while providing full control over solar generation, battery storage, and grid interaction.
With support for up to 21kW of PV input and the ability to start heavy loads such as a 5-ton air conditioning system, the FlexBOSS21 is built for serious energy applications. The inverter can be paralleled up to 16 units, delivering a combined 256kW of continuous output when using PV input, making it ideal for scalable energy storage systems.
Equipped with three independent MPPTs, users gain precise control over solar array design and performance optimization. Updated EG4 monitoring software enables full remote management, including mobile notifications and remote system configuration. When paired with GridBOSS, the FlexBOSS21 provides seamless control of the entire Energy Storage System (ESS).
Key Features
- 48V split-phase hybrid inverter and charger
- Supports off-grid, grid-assisted, and grid-export operation
- Up to 21kW solar PV input capacity
- High PV input voltage support up to 600V DC for reduced cable sizing
- Capable of starting high inrush loads, including 5-ton AC units
- Parallel support for up to 16 inverters
- Total system output up to 256kW continuous with PV input
- Three independent MPPTs for flexible solar array design
- Remote monitoring via Wi-Fi with mobile alerts and remote configuration
- Closed-loop communication with compatible battery systems
- Seamless integration with GridBOSS for full ESS control
Safety & Compliance
- Rapid shutdown capability
- Ground fault monitoring
- Arc-fault protection
- UL 1741 Certificate of Compliance
- CEC Solar Equipment Listing
System Compatibility
- Designed for use with 48V battery systems
- Compatible with EG4 energy storage solutions
- Closed-loop communication with supported batteries
- LCD Screen Kit available separately
Typical Applications
- Residential solar-plus-storage systems
- Light commercial and mixed-use installations
- Grid-tied systems with battery backup
- Off-grid and hybrid power systems
- Scalable ESS deployments
Why Choose the FlexBOSS21
The FlexBOSS21 delivers a powerful balance of performance, scalability, and intelligent control. Its high PV capacity, advanced monitoring, and comprehensive safety features make it a reliable solution for users seeking long-term energy independence and system flexibility.
What’s Included
- EG4 FlexBOSS21 Hybrid Inverter (V1.1)
- Integrated monitoring and communication hardware
LCD Screen Kit sold separately.
Your payment details are safe and secure. We accept the following:
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