The EG4 FlexBOSS21 is a split phase, all-in-one, hybrid inverter designed for the residential and small commercial markets. With a 21kW usable PV (DC) input, the FlexBOSS21 provides high power output, generating 12kW of AC power during non-sunlight conditions and a full 16kW AC with solar PV gain. It is a powerful and versatile inverter which can feed-through 90 Amps of utility power from the grid at 120/240 VAC. 
The FlexBOSS21 is an enhanced cousin to EG4’s flagship 18kPV inverter that has been designed to optimally work with EG4’s GridBOSS MID (power gateway). The combination of FlexBOSS21 and GridBOSS significantly reduces installation expenses by replacing unnecessary components and reducing installation time. This makes the FlexBOSS21-GridBOSS combination an unbeatable choice for customers looking to build powerful, cost-effective and scalable solar systems. 
 
PV Input: 21kW max usable, 24kW max input. 

On-Grid AC Output: 
Continuous: 16kW  @ 240V, 13.8kW  @ 208V 
Delivers 16kW to grid or load with PV/battery; 12kW to loads/battery without PV
 
AC Output: 
Nominal Current – 50A 
Nominal Output Voltage – 120/240V | 120/208V | 240V 
Continuous Output Power – 12000VA 
Starts a 5-ton AC unit easily
 
Dimensions: 30.4×22.3×11.2 in. 

Weight: 88 lbs. 

Warranty: 10-years 
 
Industry-Leading Capacity:
Highest PV input on the market 
Flexible Scalability:
Expands easily from small to large systems, 50-160 Amps (equivalent to full 200A service) 
Affordable Solution:
Cost-effective for any system size 
Compact Design:
Small footprint for the power and flexibility offered 
MPPTs:
three configured as 26A/26A/15A. It now allows up to 5 strings, up to 13 Amp panels at up to 3 orientations. 
When coupled with GridBOSS:
supports AC Coupling, Smart Loads, and Generator