Product Description
EG4 FlexBOSS21 Hybrid Inverter
The EG4 FlexBOSS21 is a next‑generation 48V split‑phase hybrid inverter engineered for whole‑home backup, off‑grid power, and advanced grid‑interactive solar systems. With 21kW of usable PV input, 16kW AC output with solar gain, and 12kW continuous output from battery alone, it delivers unmatched performance and scalability for residential and commercial installations.
Key Features
- 16kW AC output with PV gain / 12kW continuous from battery
- Massive 21kW PV input capacity
- Three MPPTs (26A / 26A / 15A) supporting up to 5 strings
- 48V split-phase 120/240V or 120/208V output
- Parallel up to 10–16 units depending on configuration
- EMP‑hardened design for enhanced resilience
- Fully compatible with EG4 GridBOSS power gateway
- Supports whole‑home backup up to 90A grid feed‑through
- Closed‑loop communication with EG4 LiFePO4 batteries
- Advanced Wi‑Fi monitoring with remote control
- UL 1741, UL 3141, and UL 9540 certified
Performance Highlights
- Start and run a 5‑ton AC unit
- High PV input voltage up to 600VDC
- Flexible system expansion from 50A to 160A service
- Ideal for residential, small commercial, and off‑grid systems
Technical Specifications
- Rated Output Power: 16kW (PV assist) / 12kW battery-only
- PV Input: 21kW max
- MPPTs: 3 (26A/26A/15A)
- PV Voltage Range: Up to 600VDC
- AC Output: 120/240V split-phase
- Parallel Capability: Up to 10–16 units
- Dimensions: ~29.5 × 20.5 × 11.2 in
- Weight: ~88 lb
- Certifications: UL 1741, UL 3141, UL 9540
- Warranty: 10 years
The EG4 FlexBOSS21 is one of the most advanced hybrid inverters on the market, offering unmatched scalability, safety certifications, and whole‑home backup capability.
Other Details
10 - YEAR WARRANTYProduct Videos
Custom Field
Free Shipping Free shipping is only available for orders shipped within the 48 contiguous United States. A shipping fee will be calculated and invoiced on orders shipping outside this area. The shipping fee must be paid before an order ships.
