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Fortress Power
Fortress Power Envy Duo 21 Inverter
SKU: Envy-Duo-21-STD
$5683.91
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Fortress Power Envy Duo 21 Inverter
Envy-Duo-21-STD
$5683.91
Categories
Have questions? Our team can help you select the right equipment for your project. Call 978-451-6890.
Product Overview
The Fortress Power Envy Duo 21 is a 48V all-in-one hybrid inverter built for large residential and light commercial solar systems. With 21kW of inverter capacity, up to 25kW of PV input, and 12kW continuous battery output (16kW peak), it delivers serious power in a single, scalable unit.
Key Features
- High PV Input: Accepts up to 25kW of solar input for maximum generation from large arrays
- Dual Voltage: Supports 240V split-phase and 208V three-phase configurations
- Battery Integration: Pairs with Fortress Power 48V batteries for 12kW continuous / 16kW peak output
- Scalable to 120kW: Parallel up to 10 units to grow with your energy demands
- Integrated Hardware: Built-in AC and DC breakers plus rapid shutdown transmitter for fast, code-compliant installation
- Remote Monitoring: Fortress Power mobile app with real-time production, consumption, and battery data plus remote firmware updates
Safety & Compliance
Certified to UL 1741-SA and IEEE 1547 for safe grid-connected operation. The NEMA4X / IP66-rated enclosure resists dust, water, and corrosion for indoor or outdoor installation. Arc Fault Circuit Interruption (AFCI) actively protects against electrical fire hazards.
Who Is This For?
Designed for homeowners with high energy demands, light commercial facilities, professional installers seeking a scalable platform, and anyone building a system that needs to grow over time.
Frequently Asked Questions
What size home can the Envy Duo 21 support?+
How does dual MPPT benefit my solar array?+
Can I use the Envy Duo 21 for a small commercial building?+
Does the Envy Duo 21 support battery expansion?+
Ready to order?
Contact us for pricing and availability.