EG4 Inverter/Charger 16000W 48V 120/240VAC 21000W MPPT EG4FLEXBOSS21

The EG4 FlexBOSS21 is a powerful and versatile 48V split-phase hybrid inverter designed for residential and light commercial energy storage systems. Engineered to deliver up to 16kW of continuous output, this all-in-one inverter/charger supports grid-tied, off-grid, and hybrid applications with seamless energy management.

With support for up to 21kW of PV input and the ability to parallel up to 16 units, the FlexBOSS21 provides scalable, high-performance energy solutions. Advanced monitoring, multiple MPPTs, and closed-loop battery communication ensure optimal system control and efficiency. 

Key Technology

• 16kW Continuous Output Power
  Delivers strong performance for whole-home and commercial energy applications.

• Up to 21kW PV Input Capacity
  Supports large solar arrays without requiring combiner boxes.

• 3 Independent MPPTs
  Provides flexible solar array design and optimized energy harvesting.

• 48V Battery System Compatibility
  Supports lithium battery systems with closed-loop communication via CAN/RS485.

• Split-Phase Output (120/240V)
  Designed for North American residential power requirements.

• Parallel Capability up to 16 Units
  Scales systems up to 256kW total output capacity. 

• Advanced Remote Monitoring
  Wi-Fi, Ethernet, and cellular connectivity with app-based control and notifications.

• Rapid Shutdown (RSD) Ready
  Compliant with NEC 690.12 requirements for safety.

• High Efficiency Design
  Up to 97% efficiency for optimized energy conversion and system performance.

Best Uses

• Residential Solar + Storage Systems
  Ideal for whole-home backup and energy independence.

• Off-Grid Applications
  Supports standalone systems with battery and solar integration.

• Commercial Energy Systems
  Scalable for larger installations requiring high output capacity.

• Hybrid Grid-Tied Systems
  Enables energy savings, backup power, and grid interaction.

Warranty

• Product Warranty: 10 Years

Product Specifications

High-Performance Hybrid Inverter for Scalable Energy Systems

The EG4 FlexBOSS21 delivers powerful performance, flexible system design, and advanced monitoring capabilities—making it an ideal solution for residential and commercial solar + storage installations.

Why Buy From US Solar Supplier

US Solar Supplier is an American-founded company based in Kentucky dedicated to offering top-quality solar components from trusted manufacturers. We provide competitive pricing, dependable inventory, and products backed by warranties you can trust.

Our inventory is updated daily with the latest solar technologies, and our experienced team is ready to assist with product selection, system design, and installation guidance.

Need Assistance?

Have questions before you order? Call 1-800-230-7004 to speak with our knowledgeable support team. We’re here to help with product details, compatibility questions, or purchasing support.