Fortress Power Envy Duo 21 16kW 48V Hybrid Inverter

The Fortress Power Envy Duo 21 is a high-performance, whole-home hybrid inverter engineered for demanding solar + storage systems. Delivering up to 16kW on-grid and 12kW continuous off-grid power, this 48V inverter supports a max PV array size of 25kW, three MPPT channels, and flexible voltage outputs including 120/240V split-phase, 120/208V three-phase, and 127/220V.

Designed for residential or light commercial use, the Envy Duo 21 includes a 200A transfer switch, pre-wired AC/DC breakers, and an integrated APsmart RSD transmitter—cutting down on installation time and cost. Outdoor-rated (IP66/NEMA4X), and scalable up to 120kW, it’s ready for zero-export, backup, peak shaving, net metering, and microgrid use.

Key Features:

• 16kW max on-grid output (240V) / 13.8kW (208V)
• 12kW continuous off-grid power at 240V or 208V
• Supports 25kW PV array via 3 MPPTs
• Pre-wired AC & DC breakers for faster installs
• Integrated APsmart rapid shutdown transmitter
• Outdoor rated: IP66 / NEMA 4X
• Built-in 200A transfer switch
• 120/240V split-phase, 120/208V three-phase, 127/220V output
• Wi-Fi, RS485, CAN communication
• Parallel up to 10 units (120kW total)

Applications:
Whole-home backup | Off-grid | Peak shaving | Virtual power plants | Net metering | Microgrids