EG4 GridBOSS + EG4 FlexBOSS18 Hybrid Inverter + 14.3kWh All Weather Battery Package

A turnkey backbone for whole-home or cottage energy storage. This bundle pairs the EG4 FlexBOSS18 hybrid inverter with the GridBOSS micro-grid gateway, a 14.3 kWh All Weather lithium battery, and an All Weather conduit box for clean, protected cable management. The matched components streamline CSA-compliant installation, maximize solar harvest, and give you closed-loop control through the EG4 app.

Package Includes

1 × EG4 FlexBOSS 18 hybrid inverter

1 × EG4 GridBOSS MID V3.1 Micro-Grid Interconnect Device (breakers sold separately)

1 × EG4 All Weather Battery, 14.3 kWh, 51.2 V, 280 Ah

 1 × EG4 All Weather Conduit Box

Key Features

• 13 kW split-phase output, 10 kW battery discharge, up to 18 kW PV input (600 V DC)
• < 60 W standby draw and NEMA 4X enclosure for the inverter
• GridBOSS MID V3.1 delivers greater flexibility with complete breaker customization (breakers now sold separately) and supports aluminum wiring for external connections 
• Supported breaker series: Eaton BR Series and BSB B3S Series (available as the standard GridBOSS breaker kit or individually) 
• 200A main bus with 22 kAIC main breaker capacity, with breaker positions for 1 generator (up to 125A), 3 hybrid inverters (up to 90A each), and 4 smart ports (60A to 125A range) 
• To maintain UL certification, copper wire must still be used inside the unit 
• 14.3 kWh All Weather lithium battery built for outdoor-rated installs, with high-current busbars, strong charge and discharge capability, and self-heating support for cold climates
• All Weather conduit box links battery and inverter for a code-friendly, low-profile install, while keeping terminations protected and tidy; supports side knockouts for parallel battery runs

Specifications

FlexBOSS 18 Inverter

• Continuous output: 13 kW @ 240 V split-phase
• Battery discharge: 10 kW (208 A)
• PV input: 18 kW STC, 600 V DC max, 2 × 26 A MPPTs
• Grid passthrough: 90 A
• Idle consumption: < 60 W
• Dimensions / weight: 30.4 × 22.8 × 11.2 in; 115 lb

GridBOSS MID (V3.1)

• Voltage: 120/240 VAC 
• Max Current: 200 A 
• Hybrid inverter ports: 3 (up to 90 A each) 
• Smart ports: 4 (up to 125 A each, 60A to 125A range) 
• Generator breaker position: up to 125A (breaker sold separately) 
• Main breaker compatibility: Eaton 200A CSR25K 
• Breaker compatibility: Eaton BR Series and BSB B3S Series 
• Notes: Ships without breakers. Aluminum wire is permitted for external connections. Copper wire must be used inside the unit to maintain UL certification. 

All Weather 14.3kWh Battery

• Chemistry / voltage / capacity: LiFePO₄, 51.2 V, 280 Ah
• Energy: 14.3 kWh (usable 80% DOD)
• Charge / discharge: 140 A continuous
• Self-heating element: 224 W
• Environmental rating: All Weather (outdoor-rated application)
• Dimensions / weight: 34.1 × 18.1 × 10.4 in; 286.6 lb

Canadian Installation Note 

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.

All Weather Conduit Box

• Purpose-built for FlexBOSS and All Weather battery installs
• Protects cabling and terminations for outdoor-rated applications
• Side knockouts support parallel battery runs