Consent Preferences
Skip to content

Get up to 10% off ALL Solar Kits + Free Shipping when you order today!

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.

Filters

category
$
$
Clear

    Fortress Power

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

    $1,169.00
    Shop Now

    Fortress Power

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

    $14,599.00
    Shop Now

    Fortress Power

    Fortress Power Guardian Battery Monitoring

    $620.00
    Shop Now

    Fortress Power

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

    $2,599.00
    Shop Now

    Fortress Power

    Fortress Power Envy 12kW Whole Home Solar Storage Inverter

    $6,699.00
    Shop Now

    Fortress Power

    Fortress Power | eForce Cover for Batteries

    $399.99
    Shop Now

    Fortress Power

    Fortress Power | eForce Wallmount Bracket

    $349.00
    Shop Now

    Fortress Power

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

    $10,119.00
    Shop Now

    Fortress Power

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

    $5,699.00
    Shop Now

    Fortress Power

    Fortress Power FlexRack Combining Rack for eFlex 5.4 kWh Lithium Batteries

    $2,139.00
    Shop Now

    Fortress Power

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

    $16,299.00
    Shop Now

    Fortress Power

    Fortress eVault 18.5 kWh Battery and Envy 12kW Inverter Bundle

    $13,999.00
    Shop Now

    Fortress Power

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

    $16,599.00
    Shop Now

    Fortress Power

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

    $17,999.00
    Shop Now

    Fortress Power

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

    $13,799.00
    Shop Now

    Sol-Ark

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

    $24,699.05
    Shop Now

    Sol-Ark

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

    $21,849.05
    Shop Now

    Fortress Power

    Fortress Power APSmart Duo RSD-D-20

    $65.00
    Shop Now

    Fortress Power

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

    $22,119.00
    Shop Now

    Fortress Power

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

    $16,799.00
    Shop Now

    Fortress Power

    Fortress Power Flex Tower Inverter + Battery Enclosure

    $1,999.00
    Shop Now

    Fortress Power

    Fortress Power FlexTower-Inverter Enclosure IP 65 outdoor rated

    $2,049.00
    Shop Now

    Fortress Power

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

    $13,099.00
    Shop Now

    Fortress Power

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

    $10,999.00
    Shop Now

Why Wait To Start Saving? Get Started With Build The Power Today.

  • Save 20-50% by buying direct
  • Browse and buy online – no sales meetings
  • Real energy independence for your home
Shop Now
Rated 4.5/5 by our clients

Top Solar and Generator Brands

Free U.S. Shipping

30-Day Returns

Expert Support Team

We help homeowners and businesses take control of their energy costs with direct-to-you power solutions.

Follow us

Get In Touch

  • (507) 636-3614
  • M-F 9-5 EST
  • sales@buildthepower.com
  • 312 W. 2nd St Casper, WY 82601

Useful links

Customer Support

Build The Power. All Rights Reserved.