Fortress Power eFlex Max 5.4KWH 105AH 48V Battery Description: 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. *The eFlex MAX 5.4kWh and the eFlex 5.4kWh LFP Battery are NOT compatible with each other. FEATURES Built with a saltwater-resistant aluminum enclosure, the eFlex MAX is engineered for both indoor and outdoor use — no additional protective housing required. Enjoy over 8,000 cycles and a 10 year lifespan, thanks to the battery’s patented ¾” aluminum shell, which delivers superior thermal regulation and durability — even under high-power loads. The eFlex MAX operates at up to 99% round-trip efficiency and consumes just 2W in idle mode, making it ideal for off-grid systems and maximizing energy savings. Expand your system with ease. Built-in busbars allow multiple units to be connected in parallel, supporting higher current loads and reducing wiring complexity. With a waterproof front cover and flexible wall or floor mounting, the eFlex MAX ensures a clean, fast, and code-compliant installation — no external conduits needed. Delivering premium performance at an accessible price, the eFlex MAX offers best-in-class LFP technology, high output, and unbeatable long-term value. Specifications Nominal Voltage: 51.2 V Nominal Capacity: 105 Ah Nominal Energy: 5.37 kWh Operating Voltage Range: 48 – 56 V (recommended) Max Charge/Discharge Current: 100 A / 100 A (5.12 kW) Recommended Charge Current: ≤ 55 A Peak Discharge Current (5 s): 130 A (6.6 kW) Cycle Life (EOL 70%): 8,000 cycles @ 80% DOD Efficiency: > 98% (at 0.5 C) Parallel Expansion: Up to 16 units (≈ 86.4 kWh total) Operating Temperature: –4 °F to 131 °F (–20 °C to 55 °C) Dimensions (L×W×H): 446 × 184 × 616 mm | 17.5 × 7.2 × 24.2 in Weight: 112 lb (51 kg) Terminal Type: M8 (3/8 in ring or larger) Communication: RS485 / CAN / Modbus / Wi-Fi Fault Current: 3000 A (5 ms) Warranty: 10 Years
