EG4 GridBOSS + FlexBOSS21 Hybrid Inverter + 14.3kWh All Weather Battery Package

Power your off-grid or grid-tied system with confidence using the EG4 GridBOSS + FlexBOSS-21 Kit, a complete All Weather energy storage solution built for performance, safety, and expandability. This system includes the EG4 FlexBOSS-21 (V1.1) Hybrid Inverter, a 14.3 kWh EG4 All Weather Battery, the EG4 GridBOSS Microgrid Interconnection Device (MID V3.1), and the EG4 All Weather Conduit Box. Everything is designed to integrate cleanly and support a code-friendly install when paired with the proper upstream disconnect and local requirements.

With up to 21 kW PV input, 600 V DC solar support, and intelligent smart load control, the FlexBOSS-21 is a strong fit for residential and light commercial applications. Paired with the 14.3 kWh All Weather battery and GridBOSS MID, this bundle delivers full system control, monitoring, and protection in a tidy wall-mounted format built for harsh Canadian conditions.

What’s Included

• EG4 FlexBOSS-21 Hybrid Inverter (V1.1), 48 V, split-phase, 12 kW output, up to 21 kW PV input
• EG4 All Weather Battery, 14.3 kWh, 51.2 V, 280 Ah

• EG4 GridBOSS Microgrid Interconnection Device (MID V3.1), 200A, smart load control, generator and grid input, breakers sold separately for full customization

• EG4 All Weather Conduit Box for protected, streamlined cable routing

System Highlights

• Scalable solar capacity with up to 21 kW PV input and three MPPTs
• Smart load management, generator integration, and multi-mode inverter control through the GridBOSS and EG4 ecosystem
• Remote monitoring, data, and alerts through the EG4 app and cloud dashboard
• Parallel capability up to 16 FlexBOSS-21 units for very high continuous output potential
• Safety-focused protection features including rapid shutdown support, arc-fault detection, and ground fault protection
• 14.3 kWh LiFePO4 battery designed for All Weather installs with strong charge and discharge capability and self-heating support for cold climates
• High-current internal busbars that support parallel battery configurations without external wiring blocks
• Clean cable management using the All Weather conduit box for a protected, professional finish
• GridBOSS V3.1 adds more flexibility with complete breaker customization since breakers are no longer included by default
  
• Supports aluminum wire for external connections, while copper is still required inside the unit to maintain UL certification
• Breaker compatibility includes Eaton BR Series and BSB B3S Series (available as the standard GridBOSS Breaker Kit or individually)

Canadian Installation Notes

• To meet CSA requirements, the GridBOSS is not service-entrance rated. A 100A or 200A disconnect is required between the electrical meter and the GridBOSS.
• GridBOSS V3.1 ships without breakers. Breakers must be selected and purchased separately to match your inverter, generator input, and smart-load configuration.
• Aluminum wire is permitted for external connections. Copper wire is still required inside the unit to maintain UL certification.

Specs

FlexBOSS-21 Inverter

• Output Power: 12 kW continuous (16 kW with PV input), 24 kW surge
• PV Input: 21 kW, 600 V DC max
• Voltage: 120/240 V split-phase
• Dimensions: 29.5 in x 20.5 in x 11.2 in
• Weight: 88 lb
• Warranty: 10 years

All Weather Battery

• Energy: 14.3 kWh
• Voltage: 51.2 V
• Capacity: 280 Ah
• Cycle Life: 8000+ cycles at 80% DoD
• Weight: 282 lb
• Communication: RS485 / CAN
• Certifications: UL 1973, UL 9540A
• Integrated display, self-heating, emergency shutoff compatible

GridBOSS MID (V3.1)

• Voltage: 120/240 VAC
• Max Current: 200A
• Hybrid Ports: 3, up to 90A each
• Smart Ports: 4, up to 125A each
• Operating Temperature: -40°F to 140°F
• Warranty: 10 years
• Certifications: UL Certified
• Main breaker compatibility: Eaton 200A CSR25K
• Note: Ships without breakers. Supported breaker models include BSB B3S and Eaton BR series.

Why Choose This Bundle?

This is one of the most flexible and installer-friendly EG4 system packages for Canadian conditions. Whether you are powering a home, workshop, or off-grid cabin, the FlexBOSS-21 + GridBOSS kit delivers serious solar capacity, smart load control, and a clean All Weather installation path, while keeping monitoring and control in one ecosystem.