EG4 FlexBOSS18 48V Hybrid All-In-One Inverter, 10kW AC Output, 18kW Solar Input, NEMA 4X, UL 1741 & UL 9540

The EG4 FlexBOSS18 All-In-One Hybrid Solar Inverter

The EG4 FlexBOSS18 is an all-in-one hybrid, 120/240V inverter designed for a 48V battery bank. Multiple modes of operation can be adjusted to meet the needs of every stationary power application. The hybrid functionality of this inverter means it can blend grid, solar and batteries to supply loads and appliances in any home or building.

It has a 90-Amp transfer switch and can provide partial backup for critical loads. Leverage batteries to offset grid usage during on-peak hours, and minimize grid consumption by generating power from solar panels.

Off-Grid Functionality

Off-grid applications are less expensive with the FlexBOSS18. Compared to an inverter like the EG4 18kPV, the larger transfer switch is traded for increased output capacity. Up to 10 FlexBOSS18 inverters can be scaled to cover the needs of demanding applications.

Pair with GridBOSS

Get more out of the FlexBOSS18 by pairing with the EG4 GridBOSS. While optional, the GridBOSS has comprehensive grid backup with generator and smart load capability. The GridBOSS grants flexibility in locating the FlexBOSS18, by segregating the connection to the home infrastructure.

Outdoor Rated

This is a NEMA 4X outdoor-rated unit which can be used inside or outside, even in areas with high humidity, intense rain or heavy dust. It even withstands the corrosive salt spray and damp environments found in coastal climates.

High Power Capabilities

This inverter is a highly capable powerhouse. The 195A locked rotor rating (LRA) is enough to start large loads such as a 5-ton air conditioner or large well pumps.

Boost Output with Solar

The continuous AC output power of 10kW increases to 13kW when solar is present. As the name suggests, it can accept 18kW of solar input, simultaneously feeding batteries and AC loads.

Two MPPT trackers support various solar array designs. Individual trackers are ideal for solar strings installed at different locations, angles and/or shading conditions.

Online Monitoring with EG4 Monitor Center

EG4’s web monitoring platform facilitates firmware updates, provides remote setting changes and displays data logs. Unlike other EG4 inverters, the FlexBOSS18 does not have an onboard screen, but one can be added with the FlexBOSS Screen Kit.

Closed Loop Communication with Various Battery Protocols

RS485 and CANBus closed-loop communication enables interoperability with many batteries. While best suited for use with EG4 batteries, it supports multiple protocols that are compatible with other brands. See the EG4 Battery compatibility guide.

Built-in Rapid Shutdown

When paired with EG4 batteries, the inverter features EG4’s total rapid shutdown technology that de-energizes the entire system, including the batteries. This safety feature eliminates the need for additional external battery disconnects generally required by code.