EG4 FlexBOSS21
All-In-One Hybrid Inverter
EG4 FlexBOSS21
All-In-One Hybrid Inverter
- MODEL #: IV-16000-HYB-AW-*
- SKU: EG4INV240V50AFLXBOSSv1.1
- UL 3141 | UL 1741
Simple Install
EMP
Hardened
EG4 Connect
True whole home backup.
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.
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
EMP-Hardened:
Ensures reliable operation during Electromagnetic Pulse (EMP) events.
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
- EG4 FlexBOSS21
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EG4 FlexBOSS21
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Pairs well with
GridBOSS
Microgrid-Interconnect-Device
4
Smart Ports
EMP
Hardened
1
Day Install
200 Amp
Service entrance
WallMount All Weather
All Weather Battery
14.3kWh
Storage
8,000
Cycles
10 Year
Warranty
WallMount 280Ah
Indoor Battery
14.3kWh
Storage
200A
BMS
10 Year
Warranty
Frequently Asked Questions
EG4 FlexBOSS21
The FlexBOSS21 offers the highest PV input (21kW usable, 24kW max) among EG4 inverters, delivering 16kW AC output with PV and 12kW without. It’s designed for optimal integration with the EG4 GridBOSS, reducing installation costs, and is EMP-hardened for reliability during disruptions.
Yes, with its 12kW continuous output (16kW with PV) and 50A nominal current at 120/240V, the FlexBOSS21 can power most household loads, including high-demand appliances like a 5-ton AC unit, when paired with sufficient battery storage.
The FlexBOSS21 has three MPPTs (26A/26A/15A) supporting up to five strings with panels up to 13A, allowing flexible configurations across three orientations. The maximum PV input is 24kW, with 21kW usable.
When paired with the GridBOSS, the FlexBOSS21 supports AC coupling, smart load management, and generator integration, reducing installation costs through streamlined wiring and fewer components.
The FlexBOSS21 is designed to withstand Electromagnetic Pulse (EMP) events, protecting critical electronics to ensure continued operation during natural or manmade disruptions. This feature enhances reliability for off-grid or backup scenarios.
To start the process to become a certified installer please click the link below and complete this form.
Installer Form: Become an EG4 Installer – EG4 Electronics
Next steps:
- A member of our Strategic Sales team will reach out to you to schedule a call and provide any learning material and walk you through the benefits of our program.
- Complete online training course(s).
- Attend a virtual technical training for final certification.
- Congratulations on unlocking all the benefits EG4 has to offer.