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EG4 FlexBOSS21 16kW AC Hybrid Inverter
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  • EG4 FlexBOSS21 16kW AC Hybrid Inverter
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  • EG4 FlexBOSS21 16kW AC Hybrid Inverter (1589004)
  • EG4 FlexBOSS21 16kW AC Hybrid Inverter (1589004)
  • EG4 FlexBOSS21 16kW AC Hybrid Inverter (1589004)
  • EG4 FlexBOSS21 16kW AC Hybrid Inverter (1589004)
EG4 FlexBOSS21 16kW AC Hybrid Inverter (1589004)

EG4 FlexBOSS21 16kW AC Hybrid Inverter (1589004)

$3,629.90 USD

Pickup available at Shop location

Usually ready in 2 hours

EG4 FlexBOSS21 16kW AC Hybrid Inverter (1589004)

Default Title

Shop location

Pickup available, usually ready in 2 hours

4620 S Sam Houston Pkwy W ste 450
Houston TX 77053
United States

+13464324228

The EG4 FlexBOSS21 (V 1.1) is a versatile 48V split-phase, hybrid inverter/charger that offers the same dependable power as the 18kPV with enhanced flexibility. Powerful enough to start a 5-ton AC unit, the FlexBOSS21 supports 21kW of PV input. Capable of paralleling up to 16 units together, the FlexBOSS21 has an impressive total output of 256kW continuous when using PV input. Three MPPTs give users optimal control over their solar needs, while the updated EG4 monitoring software allows for convenient total remote management, complete with mobile notifications and remote setting. Seamless interaction with GridBOSS gives users control over their entire Energy Storage System (ESS). 

Certifications & Compliance
UL 1741 Listed  |  UL 1741 SA (Grid Support)  |  NEMA-3R Enclosure  |  10-Year Manufacturer Warranty  |  NEC Rapid Shutdown Compliant

Key Features:

  • Flexible Power Options: Operate off-grid, with grid support, or sell excess power back to the grid.
  • High PV Input Voltage: Supports up to 600V DC, allowing reduced cable sizes.
  • Smart Connectivity: Remote access with Wi-Fi and closed-loop communication with compatible batteries.
  • Safety-First Design: Includes rapid shutdown, ground fault monitoring, arc-fault protection, and robust safety certifications.
  • UL 1741 Certificate of Compliance
  • CEC Solar Equipment Listing

Why Choose EG4 FlexBOSS21? The FlexBOSS21 combines efficiency, durability, and innovation, making it a top choice for those seeking robust energy solutions. Its advanced monitoring and safety features provide reliable power and peace of mind for residential or commercial installations.

Have any questions? Email us at info@solwel.com or give us a call at (346) 432-4228

Why Buy From Solwel?

  • Free Shipping on Orders Over \$10,000 — Fast fulfillment from our Houston and Dallas warehouses
  • Authorized Distributor — Genuine manufacturer-backed products with full warranty support
  • Expert Technical Support — Our team knows these products inside and out. Call us at (346) 432-4228
  • Installer Pricing Available — Contact us for volume pricing and contractor accounts
  • Stocked in Texas — Reduced lead times for Southwest and national projects

Frequently Asked Questions — EG4 FlexBOSS21 Hybrid Inverter

What makes the FlexBOSS21 an "AC hybrid" inverter?

The EG4 FlexBOSS21 is an AC-coupled hybrid inverter that connects on the AC side of your system. This makes it straightforward to add battery backup to an existing solar installation without replacing your solar inverter.

Does the FlexBOSS21 work without batteries?

Yes. The FlexBOSS21 operates in grid-tied mode without batteries. Battery storage can be added later to enable backup power and increased solar self-consumption.

What batteries are compatible with the EG4 FlexBOSS21?

The FlexBOSS21 is designed for use with EG4 batteries and supports standard LFP battery communication protocols. Contact us at (346) 432-4228 to confirm compatibility with your battery.

What certifications does the FlexBOSS21 carry?

The EG4 FlexBOSS21 is UL 1741 listed. Always verify local utility interconnection requirements with your installer before purchasing.

How does the FlexBOSS21 differ from the FlexBOSS18?

The FlexBOSS21 offers 16kW of continuous output versus 13kW on the FlexBOSS18 — making it the better choice for larger homes, homes with EV chargers, or installations with higher peak demand requirements.

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