Fortress Whole Home Solar hybrid inverter; Max 16KW ongrid and 12KW off-grid continous output;Max 21KW PV array; 200A transfer switc

Fortress Whole Home Solar hybrid inverter; Max 16KW ongrid and 12KW off-grid continous output;Max 21KW PV array; 200A transfer switch:   IP 65 outdoor rated; pre-built AC &DC breakers; Built-in Apsmart RSD transmitter; 120/240V Single and split phase, 120/208V three phase, 127/220V single & split phase; 50/60HZ; breakers included

The Fortress Power Envy Duo 21 is a powerful 48V hybrid inverter designed to handle demanding residential and light commercial energy needs. With a maximum PV input of 25kW and dual-phase compatibility (240V split-phase and 208V three-phase), it delivers 12kW of continuous output power across both confi gurations, with peak outputs of 16kW (240V) and 13.8kW (208V). Perfectly matched with Fortress Power’s 48V battery systems, the Envy Duo 21 supports multiple applications. Its integrated AC/DC breakers, rapid shutdown transmitter, and parallel scalability up to 120kW make it a versatile, future-ready solution.

Features and Specifications of the DuraRack Max

• Number of MPPT: 3
• Inputs per MPPT: 2:2:1
• Max. usable input current (A): 26/26/15
• Max. short circuit input current (A): 31/31/19
• Start input voltage (V): 100
• MPPT DC nominal voltage (V): 360
• DC voltage range (V): 100-550
• MPPt operating voltage range (V): 120-440
• Max. Power (W): 21,000
• Max. PV ARRAY POWER (W): 25,000
• Paralleling Capability: Up to 10 units (120kW)
• Dimensions (W x H x D): 2.3 x 35.2 x 11.2 in (566 x 893 x 285 mm)
• Weight: 125.71 lbs (57 kg)
• Degree of protection: NEMA4X / IP66
• Cooling concept: Smart Cooling Fans
• Topology: High Frequency Transformer-less

Backup Output Data

• Nominal output current (A): 50 @ 240V, 57.7 @ 208V
• Nominal output voltage (V): (120/240), (120/208)
• Continuous output power (VA): 12000 @ 240V, 12000 @ 208V
• Operating frequency (Hz): 60
• THDV: <3%