Fortress Power eFlex Max 5.4kWh Batteries (2) with DuraRack Mini Enclosure

Start your journey to energy independence with this eFlex MAX and DuraRack Mini bundle! Includes 2 eFlex MAX 5.4 kWh batteries and a DuraRack Mini Enclosure to safely store your batteries.

The eFlex MAX 5.4 kWh is a high-performance 48V lithium iron phosphate (LFP) battery engineered for maximum flexibility, reliability, and long-term energy savings. Designed to operate in demanding environments — from homes and apartments to off-grid cabins, RVs, and boats — it delivers uninterrupted backup power with smart inverter integration and advanced system communications. With a guaranteed 8,000+ cycle life, a 10-year warranty, and built-in safety protections, the eFlex MAX meets the highest standards for quality and performance. Whether used for solar self-consumption, backup power, or off-grid storage, it’s a versatile solution built to last.

Protect and organize your energy storage system with the DuraRack Mini Enclosure, designed to house up to two Fortress Power eFlex 5.4kWh batteries. Whether you're building a compact 48V UPS server rack or expanding your solar storage, this rugged, space-efficient enclosure helps you get the job done right.