10.8kWh Battery Solar Kit - (2) Fortress eFlex Max + DuraRack Mini Battery Solar Bundle

10.8kWh Battery Solar Kit – (2) Fortress eFlex Max 5.4 kWh + DuraRack Mini Battery Solar Bundle The Fortress Power 10.8kWh Battery Solar Bundle combines two Fortress eFlex MAX 5.4kWh lithium batteries with the Fortress DuraRack Mini enclosure to deliver a compact, scalable, and reliable energy storage solution for residential backup power and solar energy systems. Designed for indoor and outdoor installation, this bundle provides integrated busbars, expandable storage capability, and lightweight installation flexibility. The included DuraRack Mini enclosure securely houses up to two eFlex batteries while optimizing space efficiency and simplifying installation. The eFlex MAX lithium batteries utilize Tier 1 automotive-grade lithium iron phosphate (LiFePO4) cells with 8,000+ cycle life, offering dependable long-term performance for solar storage, backup power, peak shaving, and off-grid applications. Key Technology 10.8kWh Lithium Energy Storage Includes two Fortress eFlex MAX 5.4kWh lithium batteries for reliable whole-home energy storage. LiFePO4 Battery Chemistry Tier 1 automotive-grade lithium iron phosphate cells provide enhanced safety, thermal stability, and long cycle life. 8,000+ Cycle Life Engineered for long-term energy storage reliability and reduced lifetime operating costs. DuraRack Mini Enclosure Included Compact indoor/outdoor enclosure designed specifically for stacking up to two Fortress eFlex batteries. Integrated Busbars Built-in busbars simplify battery stacking and system wiring for faster installation. Indoor & Outdoor Installation IP65/IP66-rated enclosure and battery platform support flexible installation environments. Expandable System Architecture Supports scalable energy storage expansion for growing power demands. Wall-Mounted or Floor-Standing Design DuraRack Mini can be installed as a floor-standing or wall-mounted battery enclosure. Side Handles for Easy Installation Installer-friendly enclosure design improves handling and placement during setup. Best Uses Residential Solar Storage Stores excess solar production for nighttime or backup power use. Whole-Home Backup Power Provides reliable emergency energy storage during utility outages. Off-Grid Energy Systems Supports independent renewable energy systems with scalable battery storage. Peak Shaving & Time-of-Use Management Helps reduce utility costs by storing and discharging energy strategically. Space-Optimized Battery Installations Compact DuraRack Mini enclosure is ideal for garages, utility rooms, and tight installation areas. Warranty Battery Warranty: 10-Year Limited Manufacturer Warranty DuraRack Mini Warranty: 10 Years Manufacturer Warranty Bundle Includes (2) Fortress Power eFlex MAX 5.4kWh Lithium Batteries (1) Fortress Power DuraRack Mini Enclosure Integrated Busbars & Battery Connections Product Specifications Specification Details Manufacturer Fortress Power Bundle Configuration (2) eFlex MAX Batteries + DuraRack Mini Total Storage Capacity 10.8kWh Battery Chemistry Lithium Iron Phosphate (LiFePO4) Battery Cell Type Tier 1 Automotive Prismatic Cells Cycle Life 8,000+ Cycles Nominal Battery Voltage 48V Battery Voltage Range 40 – 60V Maximum Charging / Discharging Rate 250A Enclosure Type DuraRack Mini Enclosure Material Carbon Steel (SGCC Galvanized Sheet) Enclosure Protection IP66 eFlex MAX Batterie Dimensions 29.2in x 83.78in x 17.8 in eFlex MAX Batterie Weight 265 lbs Installation Type Indoor / Outdoor, Wall Mount or Floor Standing DuraRack Mini Dimensions 22 × 16.5 × 27.5 in DuraRack Mini Weight 30 lb Knockout Size 1.15 in & 2 in Recommended Cable Size to Inverter 3/0 – 4/0 Heat Dissipation Method Air Convection Communication CAN, Modbus, RS485, WiFi Certifications UL1741, UL1973, UL9540, UL9540A, CEC, SGIP About Fortress Power: Fortress Power is a leading manufacturer of advanced lithium energy storage systems designed for residential, commercial, and backup power applications. Their products are engineered for long-term performance, safety, scalability, and installer-friendly integration across modern renewable energy systems. Compact and Scalable Energy Storage Solution The Fortress Power 10.8kWh Battery Solar Bundle combines reliable LiFePO4 battery technology with the space-saving DuraRack Mini enclosure to deliver flexible, expandable, and installer-friendly energy storage for modern solar and backup power systems. Why Buy From US Solar Supplier US Solar Supplier is an American-founded company based in Kentucky dedicated to offering top-quality solar components from trusted manufacturers. We provide competitive pricing, dependable inventory, and products backed by warranties you can trust. Our inventory is updated daily with the latest solar technologies, and our experienced team is ready to assist with product selection, system design, and installation guidance. Need Assistance? Have questions before you order? Call 1-800-230-7004 to speak with our knowledgeable support team. We’re here to help with product details, compatibility questions, or purchasing support.