Big Battery EG4 GridBOSS 200A MID

The EG4 GridBOSS MID is a revolutionary power gateway designed to simplify and optimize modern energy storage systems. By consolidating up to ten components into a single, centralized unit, the GridBOSS offers unrivaled capabilities, reducing the complexity and cost of system installations while providing seamless control of utilities, inverters, generators, and loads. Engineered to outperform traditional Micro-Grid Interconnect Devices (MIDs), the GridBOSS provides a 200A service entrance rating, cutting-edge smart load management, and flexible port configurations, making it the perfect solution for whole-home backup power, micro-grid setups, solar ESS, commercial systems, and a wide range of energy optimization applications.
The GridBOSS MID all about simple, effective integration, combining your utility power connection, up to three 90A inverters, and four programmable smart ports capable of AC coupling and managing high-demand loads, all into a single device, eliminating the need for additional breakers, transfer switches, or complex wiring setups. Plus, when it comes to your power, visibility is essential and the GridBOSS was designed with that in mind, featuring real-time remote monitoring and management capabilities through EG4’s updated monitoring software, which tracks energy flow across eight different circuits for optimal system performance. The GridBOSS not only organizes your system while enhancing efficiency, but this state-of-the-art hub simplifies the installation process, reducing hardware and labor requirements, and saving you thousands in install costs.
The EG4 GridBOSS MID is the ultimate solution for simplifying ESS setups and enhancing system performance. With its centralized design, intelligent load management, and stress-free integrations, it delivers a powerful, cost-effective, and reliable energy system solution for residential and commercial applications, both on and off grid. Streamline your power system with the EG4 GridBOSS MID and unlock the true potential of your ESS today!


Features







200A Service Entrance Rating


200A Backup & Non-Backup Support


4 Configurable Smart Load Ports


8-Circuit Remote Monitoring


5-Driver Port Programming


Supports Up To 3 90A Inverters


Power Shedding Optimization


UL1741-Certified


Seamless Integration With FlexBOSS21







Suitable For







48V Battery Systems


Residential Solar Systems


AC Coupled UPS Systems


Off-Grid Backup Systems


Emergency Power Systems


Commercial ESS


Tech Specs


GRID












Nominal Voltage:
120V AC / 240V AC


Frequency:
60 Hz


Max. Continuous Current:
200A


Service Entrance Rating:
200A








GENERATOR












Nominal Voltage:
120V AC / 240V AC


Frequency:
60 Hz


Max. Continuous Current:
125A








BACKUP / NON-BACKUP












Nominal Voltage:
120V AC / 240V AC


Frequency:
60 Hz


Max. Continuous Current:
200A








HYBRID












Number of Ports:
3


Nominal Voltage:
120V AC / 240V AC


Frequency:
60 Hz


Max. Continuous Current (per port):
70A


Supported Inverters:
EG4 12kPV, EG4 18kPV, & EG4 FlexBOSS21








SMART PORTS












Number of Ports:
4


Nominal Voltage:
120V AC / 240V AC


Frequency:
60 Hz


Max. Continuous Current (per port):
125A / 80A / 60A / 60A









GENERAL












Internal Busbar Rating:
350A


Internal Fuse Rating:
315A


Operating Temperature Range:
-40ºF - 140ºF (-40ºC - 60ºC)


Relative Humidity:
0 - 100%


Altitude:
<6,561 ft (2000 m)


Protection Rating:
IP14 / NEMA 3R


Communications:
RS485 / CANBus / WiFi








DIMENSIONS












Weight:
55 lbs (25 kg)


Depth:
7 in (178 mm)


Width:
19.7 in (501 mm)


Height:
31.5 in (800 mm)



 












Spec SheetUser ManualSystem Wiring Diagrams

Orders ship within 1–5 business days. Shipping rates vary by order and destination. We ship across the U.S., with additional charges for Hawaii and Alaska. For damaged, lost, or delayed orders, please contact us for assistance.

Most products include a 12-month limited warranty covering manufacturer defects. Warranty terms may vary by product, especially lithium batteries and electrical components. Damage from improper installation, misuse, or normal wear is not covered.

Returns are accepted within 30 days of delivery for a full refund or exchange. Items must be new, unused, and undamaged, with the original order number provided. Customers are responsible for return shipping on unwanted or incorrectly ordered items. Lithium batteries must be unused and sealed to qualify for return. Damaged, defective, or incorrect orders should be reported immediately.