Fortress Power Envy Duo 21 Inverter

Power Your Future: The Fortress Power Envy Duo 21 All-in-One Inverter

Take full command of your energy with the Fortress Power Envy Duo 21 Inverter, the all-in-one 48V hybrid solution designed to meet the demands of modern residential and light commercial solar systems. This isn't just an inverter; it's the smart, scalable heart of your energy ecosystem. It's the perfect choice for DIY enthusiasts, professional installers, and homeowners in areas with high electricity rates or a need for reliable backup power. The Fortress Power Envy Duo 21 is engineered for peak performance and built to simplify your path to energy independence, no matter the scale of your project.

Key Features

• High PV Input Capacity: The Fortress Power Envy Duo 21 accepts up to 25kW of PV input, making it ideal for large residential or light commercial solar arrays seeking maximum generation potential. This allows you to connect to a large solar array to generate and store more electricity, maximizing your return on investment and ensuring power for high-demand applications.
• Dual Voltage Compatibility: This inverter supports both 240V split-phase and 208V three-phase applications, making it incredibly flexible for a wide range of grid configurations. This versatility is a key advantage for professional installers and allows for use in diverse residential and commercial settings.
• Seamless Battery Integration: The Fortress Power Envy Duo 21kw is perfectly paired with Fortress Power 48V batteries to deliver a stable 12kW of continuous power with a max up to 16kW. This ensures reliable, whole-home or light commercial backup power, providing peace of mind during grid outages.
• Scalable System Design: With the ability to parallel up to 10 units for a total output of 120kW, the Fortress Power Envy Duo 21 allows you to expand your system as your energy demands grow. This modular design eliminates the need for a complete system redesign, protecting your initial investment.
• Integrated Install-Friendly Hardware: The unit includes built-in AC and DC breakers, and an integrated rapid shutdown transmitter for faster, code-compliant installations. This feature simplifies wiring, reduces installation time, and ensures your system meets the latest safety regulations, including NEC requirements.
• Remote Monitoring and Firmware Updates: Monitor your solar production, battery performance, and grid consumption from anywhere via the Fortress Power Mobile App. The Fortress Power Envy 21 also supports remote firmware updates, ensuring your system stays up-to-date with the latest features without the need for an on-site visit.

Safety and Code Compliance: A Foundation of Reliability

Safety is a paramount concern for any solar installation, and the Envy Duo 21 is built with this in mind. It is certified to meet rigorous safety and grid-compliance standards, including UL 1741-SA and IEEE 1547. These certifications ensure the inverter's reliability and safe operation in a grid-connected environment. The integrated rapid shutdown transmitter is a critical component for fire and electrical safety, as required by modern electrical codes. The robust enclosure is rated NEMA4X / IP66, meaning it is highly resistant to dust, water, and corrosion, making it suitable for both indoor and outdoor installations in challenging environments. With features like Arc Fault Circuit Interruption (AFCI), the Fortress Power Envy Duo 21 actively protects against electrical fire hazards, giving you complete peace of mind. For homeowners and installers, this comprehensive safety framework ensures your system is not only high-performing but also fully compliant and secure.

Whether you're looking to reduce your utility bills, achieve energy independence, or prepare for power outages, the Fortress Power Envy Duo 21 is the professional-grade solution that delivers. Its high-capacity performance, scalable design, and advanced features make it the smart choice for anyone serious about solar and energy storage.

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