The EG4 FlexBOSS21 is a powerful hybrid inverter/charger designed for modern residential and light commercial solar & energy storage systems. It combines grid, PV, and battery management into one unit — offering flexibility, efficiency, and smart control in a compact design.

Key Features & Selling Points

• Hybrid / All-in-One Design
  The FlexBOSS21 supports grid-tied, battery backup, and off-grid modes—letting users run loads from the grid, solar PV, or battery seamlessly. 

• High Output Power

  • 16 kW continuous AC output (when supported by PV + grid) 

  • 12 kW continuous output using only battery (no PV) 

  • Surge / peak capacity up to 24 kW (0.5 sec) 

• Three Independent MPPTs for PV Input
  Three Maximum Power Point Trackers allow optimized solar input from multiple arrays. 

• High DC Input Range
  Supports DC input voltage range from 100 V up to 600 V, enabling longer PV string runs and lower cable losses. 

• Parallel Scalability
  Can be paralleled with up to 10 units, yielding total system output potentials up to ~160 kW. 

• Smart Monitoring & Remote Control
  Built-in WiFi / plug-in module lets you monitor and manage via EG4’s monitoring platform or app. 

• Rapid Shutdown & Safety Compliance
  Conforms to rapid shutdown requirements (NEC 690.12, CSA C22.2#330), with built-in RSD support. 

• Robust Warranty
  Comes with a 10-year standard warranty on major components.

• Split-Phase Output, High Compatibility
  Native support for 120/240 V or 120/208 V split-phase configurations. 

• High Frequency Design, Compact Size
  Despite its capabilities, it maintains a relatively compact form factor. 

Technical Specifications (Highlights)