EG4 FlexBOSS21 Hybrid Solar Inverter | 21kW PV / 16kW AC | Split-Phase | 4-MPPT | Scalable | Remote Wi-Fi Monitoring

EG4 FlexBOSS21 Hybrid Inverter Delivers High-Capacity Power So That Homes and Businesses Stay Energized

EG4 FlexBOSS21 Hybrid Inverter is engineered for homeowners, RV enthusiasts, off-grid adventurers, and mobile businesses who demand consistent, high-capacity energy. With 12kW AC output and support for up to 21,000W of photovoltaic (PV) input, this split-phase inverter powers both on-grid and off-grid systems efficiently. Whether you're running a busy household, a remote worksite, or outfitting your RV for extended travel, the FlexBOSS21 ensures your energy needs are met without compromise.

Unlike traditional single-phase inverters, this hybrid system handles large-scale PV setups with three MPPTs across five strings, providing optimal solar energy harvesting and flexible load management. Its integration with the EG4 GridBOSS MID gateway adds smart monitoring and AC coupling for seamless system expansion and generator support. Safety-conscious users will appreciate built-in rapid shutdown, ground fault, and arc fault protections, along with industry-leading certifications for peace of mind.

When investing in a hybrid inverter of this caliber, you want a partner who understands high-performance power solutions. Outbound Power combines industry expertise with a curated selection of top-tier inverters, ensuring you receive both guidance and reliable equipment. The EG4 FlexBOSS21 represents a long-term energy investment, delivering stable, high-capacity power for years to come.

EG4 FlexBOSS21 Hybrid Inverter Features

High-Capacity 12kW Output Powers Multiple Devices Simultaneously

With 12kW of AC output, the FlexBOSS21 supports homes, RVs, and small businesses at the same time. You can run essential appliances, tools, and electronics without worrying about overloads or sudden power drops.

Supports Up To 21,000W Solar Input Maximizing Energy Harvest

This inverter can handle up to 21kW of PV input from multiple solar strings. It ensures your solar panels work efficiently, producing more clean energy and reducing reliance on the grid or backup generators.

Three MPPTs Ensure Maximum Solar Energy Collection

Equipped with three MPPTs across five strings, the FlexBOSS21 tracks power from each solar panel independently. This improves energy efficiency, keeps your system balanced, and minimizes power loss due to shading or uneven sunlight.

Smart Load Management Optimizes Energy Use Automatically

The inverter intelligently distributes electricity where it’s needed most. Critical appliances receive priority while excess power is stored or redirected, reducing energy waste and keeping your system stable even during peak usage.

AC Coupling and Generator Support Expand System Flexibility

Whether you have a generator or want to add one later, the FlexBOSS21 supports AC coupling. This allows for seamless integration, uninterrupted power during grid outages, and easy expansion of your energy system over time.

Remote Monitoring and Mobile Alerts Keep You In Control

With Wi-Fi connectivity and mobile notifications, you can track performance, energy production, and system health from anywhere. Stay informed and manage your energy system easily on your phone or computer.

Advanced Safety Features Protect Your Home and System

Rapid shutdown, ground fault, and arc fault protection meet high safety standards. These features prevent accidents, protect your equipment, and give peace of mind for homes, off-grid properties, or busy work environments.

EG4 FlexBOSS21 Hybrid Solar Inverter Warranty

EG4  provides a limited 10-year warranty policy, ensuring the absence of defects in materials, workmanship, and performance during the warranty period.

What's Included

• 1 × EG4 FlexBOSS21 Hybrid Inverter
• 1 × Wi-Fi Dongle
• 1 × Wall-Mount Template
• 2 × 1-inch Current Transformers (CTs)
• 2 × L-Brackets
• 4 × RJ45 Terminals
• 1 × Mounting Bracket
• 4 × M5 × 10 Phillips-Head Screws
• 4 × M3 × 10 Phillips-Head Screws
• 1 × 2 m Orange Battery Communication Cable
• 1 × 2 m Gray Parallel Communication Cable
• 6 × Self-Tapping Screws
• 6 × Expansion Bolts

EG4 FlexBOSS21 Hybrid Inverter Manual