EG4 Split Phase 120/240VAC UL1741 CEC EG4 FlexBOSS21

EG4 FlexBOSS21 (V1.1) Hybrid Inverter – 48V Split Phase | 21kW PV Input

The EG4 FlexBOSS21 (V1.1) is a powerful and versatile 48V split-phase hybrid inverter/charger engineered for large-scale residential and commercial solar energy systems. Delivering the same trusted performance as the EG4 18kPV with enhanced flexibility, it supports up to 21kW of PV input and can parallel up to 16 units for an impressive 256kW continuous output when using PV power.

With three independent MPPT charge controllers, the FlexBOSS21 optimizes solar harvesting from multiple arrays. Its robust design allows it to start demanding loads—like a 5-ton AC unit—while advanced EG4 monitoring software offers complete remote control, system alerts, and real-time performance tracking. Seamless integration with EG4 GridBOSS provides centralized control over your entire Energy Storage System (ESS).

Note: EG4 FlexBOSS21 LCD Screen Kit sold separately.

Key Features:

• Flexible Operation Modes – Off-grid, grid-support, or grid-tied with sell-back capability

• High PV Voltage Support – Up to 600V DC, reducing cable size and installation costs

• Smart Connectivity – Built-in Wi-Fi, remote access, and closed-loop battery communication

• Safety Certified – Rapid shutdown, ground fault monitoring, arc-fault protection

• UL 1741 Compliant – CEC-listed solar equipment for code compliance

• High Power Capability – 16kW continuous output, 24kW peak surge capacity

Specifications:

• Input Voltage Range: 120/240VAC; 120/208VAC (Split-phase)

• PV Input: 21kW max, three MPPTs for optimal solar control

• Output Power: 16kW continuous (PV input) / 24kW peak surge

• Dimensions: 29.5" x 20.5" x 11.2"

• Weight: 88 lbs

• Warranty: 10-year standard coverage on major components

Breaker Compatibility (EG4 GridBOSS V2.1):

• Included: 90A Breaker (for FlexBOSS21 only)

• Smart Port Breakers available in 30A, 40A, 60A, and 80A

• Optional: 125A Breaker for Smart Port or Gen Port

• Sold Separately: 70A Breaker (EG4 18kPV), 50A Breaker (EG4 12kPV)

The EG4 FlexBOSS21 is the ultimate hybrid inverter for those who demand high performance, scalability, and intelligent energy management. Whether powering a home, business, or large-scale solar project, it offers the efficiency, safety, and flexibility you need to maximize your renewable energy investment.