EG4 GridBOSS + FlexBOSS-21 - 14.3kWh Indoor Battery & 12kW Hybrid Inverter Kit

Power your off-grid or grid-tied system with confidence using the EG4 GridBOSS + FlexBOSS-21 Kit—a complete indoor-rated energy storage solution built for performance, safety, and expandability. This system includes the advanced EG4 FlexBOSS-21 (V1.1) Hybrid Inverter, a 14.3kWh WallMount Indoor Battery, the EG4 GridBOSS Microgrid Interconnection Device, and a custom Indoor Buildable Conduit Box—all designed for seamless installation and CSA-compliant integration.

With a massive 21kW PV input, intelligent smart load control, and 600V DC solar support, the FlexBOSS-21 is ideal for both residential and light commercial energy setups. Paired with the robust indoor-rated 14.3kWh battery and GridBOSS MID, this bundle offers full system control, monitoring, and protection in a clean, wall-mounted form factor.

What’s Included:

• EG4 FlexBOSS-21 Hybrid Inverter (V1.1) – 48V, Split-Phase, 12kW Output, 21kW PV Input

• EG4 14.3kWh Indoor WallMount Battery (280Ah, 51.2V) – CSA-certified with built-in BMS and touch display

• EG4 GridBOSS Microgrid Interconnection Device (MID V2) – 200A, Smart Load Control, Generator & Grid Input

• EG4 Indoor Buildable Conduit Box – Streamlined cable protection and NEC-compliant spacing

System Highlights:

• Massively scalable solar capacity with up to 21kW PV input and three MPPTs

• Smart load management, generator integration, and multi-mode inverter control

• Remote monitoring and alerts via EG4 app and cloud dashboard

• Parallel up to 16 FlexBOSS-21 units for 256kW continuous output

• Safety-first design with rapid shutdown, arc-fault detection, and ground fault protection

• Wall-mounted 14.3kWh lithium iron phosphate battery with integrated LCD and self-heating

• Internal 600A busbars for parallel installations without external wiring blocks

• Clean cable routing with buildable conduit box for CSA/NEC compliance

Canadian Installation Notes:

• The EG4 GridBOSS is not service entrance rated. A 100A or 200A disconnect is required between the electrical meter and the inverter to meet ESA requirements.

• The GridBOSS MID includes a 90A breaker compatible with the FlexBOSS-21. Other inverters (e.g., 18kPV or 12kPV) require separate breakers.

• To meet UL certifications inside the GridBOSS MID, copper wire must be used.

Specifications Summary:
FlexBOSS-21 Inverter

• Output Power: 12kW continuous (16kW w/ PV input), 24kW surge

• PV Input: 21kW, 600V DC max

• Voltage: 120/240V split-phase

• Dimensions: 29.5" x 20.5" x 11.2" | Weight: 88 lbs

• Warranty: 10 years

WallMount Battery

• Energy: 14.3kWh | Voltage: 51.2V | Capacity: 280Ah

• Cycle Life: 8000+ (80% DoD) | Weight: 282 lbs

• Communication: RS485/CAN | Certifications: UL 1973, UL 9540A

• Integrated LCD screen, self-heating, emergency shutoff compatible

GridBOSS MID

• Max Current: 200A | Hybrid Ports: 3 x 90A | Smart Ports: 4 x up to 125A

• Service entrance capable with 200A Eaton CSR25K breaker (sold separately)

• Operating Temp: -40°F to 140°F | Warranty: 10 years

Why Choose This Bundle?
This is the most flexible, powerful, and installer-friendly EG4 energy system to date—built for the Canadian climate and code. Whether you're powering a home, workshop, or off-grid cabin, the EG4 FlexBOSS-21 + GridBOSS Kit gives you serious power, safe installation, and total control—all in one streamlined package.