Fortress Power

Fortress Power LiFePO4 Battery – eFLEX 5.4 kWh


With Fortress Power, use the most of the sun!  This compact lithium storage system will fulfill your residential and commercial needs. Fortress’ storage systems are easily added to a new or existing solar photovoltaic installation.

  • Description

    The eFLEX 5.4 kWh is designed with the goal of building the world’s most robust lithium battery for all different application scenarios and harsh
    weather conditions.

    • Tier 1 Automotive Prismatic Lithium Iron Phosphate Cell with the highest cycle life
    • Patented Enclosure design achieves 4 times better thermal performance than our competitors
    • IP 65 Dust and Water Proof design for outdoor install
    • Flexible mounting options (wall mount, floor-stand or standard 19”
    industrial server rack mount)

    Market-leading Digital Processor Battery Management System (BMS) includes:
    • High amperage Contactor Disconnects
    • Individual cell voltage & temperature monitoring and balancing for
    maximum reliability and longevity
    • Canbus, Modbus, and Wi-Fi communication enable Internet-of-Things
    • Advanced closed-loop communication with most 48V inverters

  • Technical specifications


    Total Energy

    5.376 kWh

    Nominal Voltage


    Voltage Range

    45-58.4 V

    Max. Charge Current(Continuous)

    100 Amp / Recommended Charge Current: 55A

    Max. Discharge Current(Continuous)

    100 Amp / Recommended Continuous Discharge Rate: <68A Recommend Storage temperature

    32 to 95 F

    Charge temperature

    32 to 113 F


    105 Amp-hour

    Dimension(H x W x D)

    7.2″ x 17.5″ x 21.5″


    116 lbs

  • Reference documents


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