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Fortress Power

Fortress Power – Advanced Lithium Battery Storage for Home and Business

Take control of your energy with Fortress Power lithium battery systems, engineered for reliable whole-home backup, solar self-consumption, and scalable off-grid solutions. Built with premium-grade LiFePO₄ cells, Fortress batteries deliver long life, high efficiency, and unmatched safety — ideal for residential, commercial, or industrial energy storage.

Whether paired with a solar system or used as a standalone backup solution, Fortress Power ensures peace of mind with robust performance and U.S.-based support.

Browse our Fortress Power collection to build a smarter, safer energy storage system today.

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    Fortress Power

    Fortress Power FlexTower-Inverter Enclosure IP 65 outdoor rated

    $1,946.99
    $1,663.99
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    Fortress Power

    Fortress Power DuraRack with 4 eFlex 5.4kWh G2 Lithium Iron Phosphate (LFP) Batteries with Wall Mount Bracket

    $12,443.99
    $10,639.99
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    Fortress Power

    Fortress Power DuraRack with 3 eFlex 5.4kWh G2 Lithium Iron Phosphate (LFP) Batteries with Wall Mount Bracket

    $10,448.99
    $8,933.99
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    Fortress Power

    Fortress Power DuraRack Without Battery

    $1,946.99
    $1,663.99
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    Fortress Power

    Fortress Power eVault 18.5 kWh Lithium Ferro Phosphate Battery

    $7,123.99
    $6,090.99
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    Fortress Power

    Fortress Power Envy 10 kW Whole Home Solar Storage Inverter

    $4,938.99
    $4,222.99
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    Fortress Power

    Fortress Power Envy 8kW Whole Home Solar Storage Inverter

    $4,748.99
    $4,059.99
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    Fortress Power

    Fortress Power Lithium Iron Phosphate Battery eVault Max 18.5 kWh

    $8,263.99
    $7,065.99
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    Fortress Power

    Fortress Power Lithium Iron Phosphate Battery eFlex Max 5.4 kWh

    $1,993.99
    $1,704.99
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