BigBattery - EG4 FlexBOSS21 12kW (21kPV) Hybrid Inverter

Description

Unleash Smart, Scalable Power with the EG4 FlexBOSS21 Hybrid Inverter

The EG4 FlexBOSS21 is a next-generation 12kW hybrid inverter engineered for high-performance energy systems across residential and commercial settings. With a massive 21kW PV input and robust grid-tied and off-grid functionality, this inverter is built to be the foundation of your energy independence.

Its 3 MPPT inputs support up to 5 solar strings, offering superior flexibility for varied roof orientations and maximum solar harvesting. Plus, the FlexBOSS21 handles 90A of grid feed-through at 120/240VAC, making it a true powerhouse for grid-connected environments. Seamless integration with the EG4 GridBOSS MID power gateway also enables rapid installation, smart load control, AC coupling, and generator support—all from a single, streamlined system.

Key Features

Massive PV Input Capacity

• Supports up to 21kW PV for large-scale solar systems

• 3 MPPTs and 5 string support for multi-orientation flexibility

Hybrid Performance

• 12kW rated power for grid-tied and off-grid systems

• Handles 90A grid feed-through at 120/240VAC

• Compatible with EG4 GridBOSS MID for rapid setup and integration

Smart Load & Power Management

• Built-in AC coupling and generator support

• Smart load prioritization for backup and self-consumption

• Minimizes grid dependence and maximizes savings

Enhanced Safety Systems

• Responsive rapid shutdown

• Arc fault and ground fault protection

• Meets top-tier safety certifications for residential and commercial use

Advanced Monitoring

• Wi-Fi connectivity with updated EG4 monitoring platform

• Remote management and real-time mobile alerts

• Full visibility and control over your system’s performance

Ideal for

• Residential solar + storage installations

• Commercial buildings and energy-intensive properties

• Scalable hybrid energy systems

What's in the Box 

• (1) EG4 FlexBOSS21 Hybrid Inverter

• (1) Mounting & Installation Kit

• (1) User Manual

Specification

Downloads