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eFlex 5.4kWh LFP Battery

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The Fortress Power eFlex is a 5.4 kWh scalable energy storage solution based on safe and energy dense prismatic Lithium Iron Phosphate cells. The digital processor Battery Management System (BMS) includes high amperage contactor disconnects and advanced Closed-Loop inverter communication, as well as individual cell voltage monitoring, temperature monitoring, and cell balancing to maximize reliability and longevity.

Canbus, modbus, and wifi communication enable internet-of-things compatibility. The IP65 case ensures direct water spray and dust will not penetrate the battery internals from all directions. The unit can be wall mounted, floor mounted, and server rack mounted for hard-to-reach access in renewable, marine, RV, mobile, telecom, railway applications and more.

    Key Features

    • Rugged, Long-lasting, Daily Use Battery
    • Safe Lithium Iron Phosphate Technology (LifeP04)
    • 98% Round Trip Efficiency
    • Flexible Mounting Options
    • Remote Monitoring including wifi, modbus, and canbus
    • BMS Monitors & Balances Individual Cells
    • NRTL certified to UL9540 and UL9540a standards


    Name eFlex 5.4
     Total Energy(kWh)  5.4
    Max. Charge Current (Continuous) [A] 100
    Max. Discharge Current (Continuous) [A] 60
    Max. Pulse Current (for 5 sec) [A] 130
    Capacity [Ah] 105
    Voltage Range [V] 48-55
    Charging Temperature [F] 32 to 113
    Discharging Temperature [F] 32 to 140
    Storage Temperature [F] 32 to 95
    Dimension [L x W x H, inch] 21.5 x 17.5 x 7.2
    Weight [lbs] 116
    Life Cycles 8000 @ 80% DoD
    Round Trip Efficiency >98%