EG4 FlexBOSS21 Complete Hybrid Power System – 16kW Inverter with 28.6kWh WallMount Indoor LiFePO4 Batteries & GridBOSS for Whole-Home Backup & Off-Grid (2 Batteries Variant)
Model #: FlexBOSS21 SKU: EG4-WM48x2-CB2
Product Details
Product Description for EG4 FlexBOSS21 Complete Power System – 16kW Hybrid Inverter with 2x 14.3kWh WallMount Indoor Batteries & GridBOSS
EG4 FlexBOSS21 Complete Hybrid Power System – 16kW Inverter with 28.6kWh WallMount Indoor LiFePO4 Batteries & GridBOSS for Whole-Home Backup & Off-Grid
The EG4 FlexBOSS21 Complete Power System is a powerful all-in-one hybrid energy solution combining the 16kW FlexBOSS21 Hybrid Inverter, two 48V 280Ah WallMount Indoor LiFePO4 Batteries (28.6kWh total), Indoor Buildable Conduit Boxes, and GridBOSS 200A MID for seamless home integration and energy control.
Key Features • All-in-One Hybrid Inverter – 16kW output with 21kW PV input, split-phase 120/240V, transformerless high-frequency design. • 28.6kWh LiFePO4 Storage – Two WallMount Indoor Batteries with >8000 cycles, built-in BMS, and 15+ year design life. • GridBOSS 200A MID – Automatic load transfer and safe grid/battery switching for whole-home backup. • High Solar Compatibility – 21kW PV input for maximum renewable energy harvest. • Expandable & Scalable – Parallel up to 16 inverters, add more batteries as needed. • Smart Monitoring – RS485/Wi-Fi/CAN communication with app control. • Indoor-Rated Durability – Reliable operation with built-in protections. • Certified & Safe – UL-compliant components for code-compliant installations.
Specifications at a Glance Inverter Power: 16kW continuous • PV Input: 21kW max • Battery Capacity: 28.6kWh (51.2V 280Ah x2) • Charge/Discharge: Up to 200A • Cycle Life: >8000 at 80% DOD • Dimensions (Inverter): 30.43 × 22.28 × 11.22 in • Weight (Inverter): 88 lbs • Battery Weight: 282.2 lbs each • Operating Temp: -13°F to 140°F • Warranty: 10 years inverter/GridBOSS, full manufacturer battery warranty
Ready for whole-home backup or off-grid independence? This EG4 FlexBOSS21 system with 2 indoor batteries is in stock and ships fast from lithiumion-batteries.com!
(For full technical details, download the datasheet or manual linked on the product page.)
