8kW Solar Kit + 11.2kWh Battery Storage: Fortress Power Envy 8kW Hybrid Inverter + eFlex Lithium Batteries + DuraRack Mini

MPN: Envy8 / eFlex 5.6/ Durarack Mini

Save $800 with bundling and free ship. 

Includes: 

• 1 × Fortress Power Envy 8kW Hybrid Inverter
• 2 × Fortress Power eFlex 5.6kWh Lithium Batteries (Total: 11.2kWh Storage)
• 1 × Fortress Power DuraRack Mini Battery Enclosure Kit ( Enclosure for eFlex 5.4 kWh Batteries)
• Battery Interconnection Cables & Required

Get dependable, high-output backup power and flexible energy storage in one streamlined system. The Fortress Power Envy 8kW paired with two eFlex 5.6kWh lithium batteries delivers a balanced solution for homeowners looking to power essential loads—or expand toward whole-home backup—while maintaining clean installation and future scalability.

Designed for performance and ease of integration, this system combines strong continuous output with long-lasting LiFePO4 storage, all housed within the DuraRack Mini for a compact, organized install.

How many panels? 

DC sizing: 1.2× – 1.5× inverter size

Approximately 22–26 panels (450W each)

Key Benefits

• 8kW Continuous Output Power – Run essential loads or support whole-home backup depending on system design
• 11.2kWh Battery Storage – Reliable runtime for outages, peak shaving, and energy shifting
• Scalable Battery Architecture – Easily expand storage as energy needs grow
• Integrated Hybrid Inverter – Supports grid-tied and battery-backed applications
• Clean, Compact Installation – DuraRack Mini keeps batteries organized and protected
• LiFePO4 Battery Chemistry – Long lifespan, enhanced safety, and thermal stability
• Optimized System Matching – Components designed to work seamlessly together
• Ideal for 2026 Energy Landscape – Maximize self-consumption and reduce grid reliance as incentives shift

Applications

• Whole-home backup (system design dependent)
• Partial home backup / essential loads panels
• Grid-tied solar with battery storage
• Energy arbitrage and peak shaving
• Off-grid or hybrid system builds (with proper design)

System Performance Overview

• Power Output: 8kW continuous (inverter-limited)
• Battery Capacity: 11.2kWh total storage
• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Scalability: Expandable battery architecture
• Installation Type: Indoor / protected installations (rack-mounted system)

Product Specifications

Why Fortress Power

Fortress Power is known for delivering robust, installer-friendly energy storage solutions built for real-world performance. With a focus on reliability, scalability, and strong technical support, Fortress systems are designed to meet the growing demand for home backup and energy independence—without unnecessary complexity.