EG4 FlexBOSS18 13kW AC Hybrid Inverter

The EG4 FlexBOSS18 is a professional-grade hybrid inverter built to deliver serious performance at an accessible price point — a strong choice for installers and DIY builders who want a powerful, cost-effective hybrid solar solution. It provides 13kW of continuous output with PV, supports up to 18kW of maximum solar input, and delivers 10kW of battery-only output, making it capable of handling both grid-tied and fully off-grid systems.

The FlexBOSS18 integrates seamlessly with EG4 batteries and pairs especially well with the EG4 GridBOSS MID, which combines to create a unified energy management system. Together they reduce installation costs and complexity, eliminate the need for extra breakers and transfer switches, and enable time-of-use optimization, load shifting, and backup power prioritization — giving you full control over how your system uses and stores energy.

Key Specs:

• Continuous Output (with PV): 13kW
• Max Solar Input: 18kW
• Battery-Only Output: 10kW
• Compatibility: EG4 batteries; pairs with EG4 GridBOSS MID
• Certification: UL1741
• Applications: Residential and commercial, grid-tied or off-grid

Whether you're upgrading an existing system or designing a new one from the ground up, the FlexBOSS18 delivers the output, flexibility, and scalability to take control of your energy future.