6. PRODUCT OVERVIEW
The EG4
®
FlexBOSS21 is a 12/16kW, 120/240VAC split-phase, all-in-one, hybrid, sine wave inverter
designed for the residential and small commercial markets. The FlexBOSS21 can utilize 21kWs of DC
(STC) solar PV on three MPPTs (26/26/15A) and can generate 12kWs of power during non-sunlight
conditions and 16kWs with solar PV gain. It can feed through 90A of utility power from its grid port to
load port. The FlexBOSS21 is an enhanced power-level cousin to EG4’s flagship 18kPV inverter that
has been designed to optimally work with EG4’s GridBOSS power gateway though it can function as a
stand-alone inverter as well as those not needing the full feature set of the 18kPV or GridBOSS.
6.1 FEATURES
• Applicable for off and on grid situations.
• Has three MPPT solar charge controllers, supporting PV input of 600V with an optimal range
of 120VDC – 440VDC.
• Three MPPTs allow flexibility in paralleling strings. MPPT 1 and 2 allow up to 26A each, while
MPPT 3 allows 15A, for a total of 21kW of utilized solar power.
• Added safety features such as PV Arc Fault Protection, PV Ground Fault Protection, PV
Reverse Polarity Protection, Pose Sensitive Leakage Current Monitoring Unit, Surge
Protection device, and Integrated PV Disconnect.
• Rated for 16kW output, with a power factor of 1.
• Supports up to 10 inverters in a parallel configuration.
• Supports Closed-Loop communications with all EG4
®
batteries and a wide selection of 3
rd
party batteries using CAN/RS485 protocols.
• Features remote monitoring and firmware updates via EG4
®
mobile app and Monitor Center
website.
6.2 OPERATION OVERVIEW
The information below provides a high-level overview of the general operation of the inverter.
• FlexBOSS21 is a split-phase hybrid inverter that has the ability to operate off and on the grid.
• Designed for rural and suburban homeowners, and small commercial companies seeking
energy savings and independence.
• Has the ability to power loads while simultaneously charging batteries.
• Harness multiple power sources, including photovoltaic (PV), battery storage, as well as the
grid.
• Incorporates MPPTs, a bi-directional DC-AC inverter, grid interaction, and battery
connectivity.
• Users can monitor system performance and perform updates remotely via the EG4
®
Monitoring website and mobile app, ensuring control and flexibility.
• Supports 24kW of DC (STC) solar PV input while producing 16kW of continuous AC output,
even during battery charging, positioning it as an effective option for those looking to
implement a robust Energy Storage System.
• Full AC coupling, generator, and smart loads capabilities when used with GridBOSS.
• Features a comprehensive list of certifications that ensure code compliance while offering
additional safety and reliability.
• Modular design allows for expansion, adapting to growing energy needs and securing future
efficiency in solar investment.
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