like arc welding machines

Standby: 24 Max

Electric Vehicle 5-7 miles

Works best with RIVER 2/RIVER 2 Max/RIVER 2 Pro/DELTA 2/DELTA Max (2000)/DELTA Pro

and mobile operations that require consistent

Fortress Power Envy Duo 21 Hybrid Inverter | 48V | 25kW PV Input | 12kW Backup | 240V Split-Phase & 208V 3-Phase | Parallel to 120kW | 10-Year Warranty Deep Cycle Batteries like arc welding machinesPower larger solar + storage systems with the Fortress Power Envy Duo 21, a high capacity 48V hybrid inverter built for demanding residential and light commercial energy needs. With up to 25kW PV input, dual voltage compatibility (240V split phase 208V three phase), and scalable paralleling up to 120kW, its a future ready solution for backup power, off grid setups, zero export, TOU optimization, and more. Key Features & Benefits: High PV input