Fortress 16 kW Duo 21 Solar Storage Kit — Product Summary The Fortress 16 kW Duo 21 Solar Storage Kit is a complete, high-performance energy solution combining a powerful hybrid inverter, substantial battery storage, a 14.4 kW solar array, and NEC-compliant rapid shutdown protection. This system is engineered to deliver efficient solar generation, dependable backup power, and modern safety features for residential or light commercial installations. At the heart of the kit is the Fortress Power Envy Duo 21 hybrid inverter, a 48 V DC hybrid inverter offering up to 16 kW AC output and 12 kW continuous backup power, capable of managing both solar production and battery charge/discharge in a single unit. It supports dual-phase 240 V split-phase and 208 V three-phase configurations, making it flexible for a wide range of service panels and load profiles. Paired with 32 kWh of Fortress Power 48 V battery storage, the system provides significant energy reserves to sustain household loads during grid outages, peak shaving, or time-of-use optimization. The included 14.4 kW solar array is sized to effectively charge the battery bank and supply daytime loads, helping reduce utility dependence and maximize self-consumption. For enhanced safety and code compliance, the kit integrates Tigo rapid shutdown hardware (module-level or system transmitter depending on configuration) to meet NEC 690.12 rapid shutdown requirements, ensuring PV DC circuits can be quickly and safely de-energized in emergency conditions. This Fortress kit also includes features for streamlined installation and future expandability: Multiple MPPT solar inputs for flexible array design Built-in AC/DC breakers and transfer switching to simplify install labor Scalability with parallel inverter capability for larger or multi-unit systems Remote monitoring via mobile app and firmware updates for ongoing performance management Why This Kit Matters The Fortress 16 kW Duo 21 Solar Storage Kit provides a balanced combination of power, storage, and safety for homeowners and small businesses seeking: Reliable whole-home backup power High solar energy harvest and battery charging capacity Modern rapid shutdown safety compliance Flexible system configuration for growth and resiliency Whether used for everyday grid support, peak shaving, or emergency backup, this integrated kit delivers performance, durability, and professional-grade features that align with today’s solar storage expectations. What’s Included: Inverter• Fortress Power Envy Duo 21 Inverter – 1 Battery Storage• Fortress Power eBoost 16 kWh All Weather Battery – 2• Fortress Power eBoost eWay Battery Box Wire Management System – 1• Fortress Power eWay Lite Battery Box Wire Management System – 1 Solar Panels• 14.4KWH Solar Wire / Solar Connectors• 10 AWG PV Wire Black – 100 ft• 10 AWG PV Wire Red – 100 ft • Solar Connectors Male and Female – 10 pairs Rapid Shutdown• Tigo Rapid Shutdown TS4-A-F (725W, 22A, 1.2 m) – One per panel
