Title
Fortress Power eFlex 5.4kWh Battery**
Fortress Power eFlex 5.4kWh Battery
Compact Power. Long-Lasting Performance.
The Fortress eFlex 5.4kWh Lithium Iron Phosphate Battery is a flexible, reliable energy storage solution built for both grid-tied and off-grid solar systems. Designed for performance and versatility, the eFlex delivers long-lasting, maintenance-free power for homes and businesses alike.
fits in the eg4 battery rack.
Key Features
• 5.4kWh Storage Capacity – Scalable design to meet small or large energy storage needs.
• LiFePO4 Chemistry – Safe, stable, and proven lithium iron phosphate technology for maximum lifespan and safety.
• Indoor/Outdoor Ready – Rugged IP65-rated enclosure supports installations in nearly any environment.
• Wall-Mount or Floor-Stackable – Flexible mounting options using optional brackets.
• Seamless Integration – Pairs effortlessly with Fortress inverters, including the Envy 12kW and Guardian lines.
Whether you’re adding backup power, optimizing solar self-consumption, or designing a fully off-grid setup, the eFlex battery gives you the confidence and control to manage your energy your way.
What’s Included:
• 1 × eFlex 5.4kWh Battery
• Integrated BMS (Battery Management System)
• Quick-Connect Terminals
• Instruction Manual
Recommended Accessories:
Pair it with the eFlex Mounting Brackets, eWay Conduit Box, and Cover Plate for a complete, polished installation.
We’re committed to building a cleaner, more resilient future—one product at a time. From choosing durable, second-life components to adopting low-impact packaging and environmentally responsible manufacturing, we’re rethinking every step of our process.
Our focus includes reducing waste, improving energy efficiency, and expanding access to off-grid solutions that empower our customers while protecting the environment.
Shipping & Returns
PickUp & Delivery
We recommend in-store pickup on St. John for the fastest service. Delivery is available to a designated pickup point in Red Hook, St. Thomas.
Returns
We cannot guarantee returns on all items. Please contact us to resolve any issues.
Shipping & Returns
PickUp & Delivery
We recommend in-store pickup on St. John for the fastest service. Delivery is available to a designated pickup point in Red Hook, St. Thomas.
Returns
We cannot guarantee returns on all items. Please contact us to resolve any issues.
Warranty
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
Any warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
Warranty
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
Any warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
Secure Payment
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Diners Club, Discover and more.
Secure Payment
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Diners Club, Discover and more.