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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 | eForce eWay and Base for AC and DC wire management and floor mount

    $1,110.99
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    Fortress Power

    Fortress Power 600Ah eForce 28.8kWh Stackable Lithium Iron Phosphate Battery

    $13,868.99
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    Fortress Power

    Fortress Power Guardian Battery Monitoring

    $588.99
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    Fortress Power

    Fortress Power eFlex 5.4kWh G2 Lithium Iron Phosphate (LFP) Battery with Wall Mount Bracket | 10 Year Warranty

    $2,468.99
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    Fortress Power

    Fortress Power Envy 12kW Whole Home Solar Storage Inverter

    $6,363.99
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    Fortress Power

    Fortress Power | eForce Cover for Batteries

    $379.99
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    Fortress Power

    Fortress Power | eForce Wallmount Bracket

    $331.99
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    Fortress Power

    Fortress Power 400Ah eForce 19.2kWh Stackable Lithium Iron Phosphate Battery

    $9,612.99
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    Fortress Power

    Fortress Power 200Ah eForce 9.6kWh Stackable Lithium Iron Phosphate Battery

    $5,413.99
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    Fortress Power

    Fortress Power FlexRack Combining Rack for eFlex 5.4 kWh Lithium Batteries

    $2,031.99
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    Fortress Power

    Fortress Envy 12kW Inverter with 4 eFlex G2 5.4kWh Batteries and Durarack Bundle

    $15,483.99
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    Fortress Power

    Fortress eVault 18.5 kWh Battery and Envy 12kW Inverter Bundle

    $13,298.99
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    Fortress Power

    Fortress Envy 12kW Hybrid Inverter, 4 eFlex G2 5.4 kWh Lithium Batteries, Durarack Enclosure and Guardian Battery Monitoring Bundle

    $15,768.99
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    Fortress Power

    Fortress Envy 12kW Inverter and 4 eFlex G2 5.4 kWh Lithium Batteries Bundle

    $17,098.99
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    Fortress Power

    Fortress Envy 12kW Inverter with 18.5 kWh eVault Battery and Guardian Battery Monitoring Bundle

    $13,108.99
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    Sol-Ark

    Sol-Ark 15K + Fortress Power eFlex Battery + Fortress Durarack Enclosure Bundle

    $24,699.05
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    Sol-Ark

    Sol-Ark 12K + Fortress Power eFlex Battery + Fortress Durarack Enclosure Bundle

    $21,849.05
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    Fortress Power

    Fortress Power APSmart Duo RSD-D-20

    $61.99
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    Fortress Power

    Fortress Power FlexTower with Envy True 12 kWh Inverter and 4 eFlex 5.4 kWh LFP Batteries

    $21,012.99
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    Fortress Power

    Fortress Power FlexTower with Envy True 12 kWh Inverter and 3 eFlex 5.4 kWh LFP Batteries

    $15,958.99
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    Fortress Power

    Fortress Power Flex Tower Inverter + Battery Enclosure

    $1,898.99
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    Fortress Power

    Fortress Power FlexTower-Inverter Enclosure IP 65 outdoor rated

    $1,946.99
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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
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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
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