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

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.