EG4 Inverters

EG4 Inverter Guide: 6kW to 21kW Hybrid Models Compared

An EG4 inverter is the brain of a 48V solar system. It takes DC from your panels and battery bank and turns it into 120/240V split-phase power for the house, manages charging, and in the hybrid models decides when to lean on the grid and when to run on stored energy. EG4 builds them as all-in-one units with the MPPT solar chargers inside, so you are not buying a separate charge controller.

This collection carries five EG4 inverters, four of them in stock, from the 6,000W EG4 6000XP at from $1,499 to the FlexBOSS21 at from $3,600. The older 12kW 18kPV is currently sold out. Between them they cover a cabin on a modest battery bank and a large home with 20kW of roof solar.

How to choose an EG4 inverter

• Continuous output. Add up the loads that run at once. The EG4 6,000W 120VAC/240VAC Off-Grid Hybrid Solar Inverter handles a cabin or a home under 3,000 sq ft on essentials. The EG4 12kPV 8,000W 48V Hybrid Inverter steps up to 8,000W. The FlexBOSS18 delivers 13,000W continuous, and the FlexBOSS21 12,000W on its own or 16,000W with solar assisting.
• PV input. The 6000XP accepts up to 8,000W of solar across dual MPPT. The EG4 FlexBOSS18 18kW Split-Phase Hybrid Solar Inverter takes 18,000W over two trackers and four strings; the EG4 FlexBOSS21 21kW Split-Phase Hybrid Solar Inverter takes 21,000W over three trackers and five strings. More strings means more roof faces you can wire separately.
• Indoor or outdoor mounting. The 12kPV and FlexBOSS21 sit in NEMA 4X enclosures rated for direct outdoor installation. That matters if the garage wall is full.
• Grid-tied, off-grid or both. The 12kPV and both FlexBOSS models work grid-tied, off-grid or anywhere in between. The 6000XP is built for off-grid and grid-assist with a sub-15ms transfer time.
• Room to grow. The 6000XP parallels up to 16 units. The FlexBOSS pair integrates with EG4's GridBOSS hub for larger multi-inverter layouts, and the FlexBOSS18 adds built-in 4G for sites without dependable Wi-Fi.

Popular picks in this collection

Setup and usage tips

• Size the inverter with the Solar Kit Calculator. It estimates inverter watts along with battery and panel size from your appliance list and ZIP code, so you are not guessing at continuous load.
• Check string voltage against the MPPT window before ordering panels. Each tracker has its own limits; the FlexBOSS21's three trackers let you split east, west and south roofs.
• Pair with a 48V lithium bank that can deliver the current. A 12,000W inverter pulling from 48V needs batteries rated for well over 200A combined.
• If you want an eg4 hybrid inverter to export or sell back, confirm your utility's interconnection rules first. Off-grid installs skip that step.
• The 12kPV, FlexBOSS18 and FlexBOSS21 carry a 10-year manufacturer warranty; register the unit after commissioning.

Frequently asked questions

Do EG4 inverters need a separate charge controller? No. Each model here includes MPPT solar input, from dual trackers on the 6000XP to three on the FlexBOSS21. Panels wire straight to the inverter.

Is there an eg4 8k inverter? Yes, the 12kPV. Its AC output is 8,000W continuous, it is rated for direct outdoor installation in a NEMA 4X enclosure, and it carries the 10-year warranty.

What replaced the eg4 inverter 240v 12kW model? The 18kPV is sold out. The FlexBOSS18 and FlexBOSS21 cover the same 12kW-class role with higher PV input, UL 9540 listing and GridBOSS integration.

All EG4 inverters ship free to the mainland US from brand partner warehouses, usually within a few business days, with 30-day returns. Call and we will match an inverter to your battery bank and array.