In this exclusive interview with Matthew Daniel, Product Manager for Fortress Power’s 48V energy storage line, we take a closer look at the all-new eBoost Energy Storage System (ESS) — a scalable, high-output, and installer-friendly solution designed for whole-home backup, small commercial applications, and off-grid energy independence. Building on the success of the eForce, the eBoost condenses Fortress Power’s most in-demand features into a compact, monolithic form factor that delivers faster installs, seamless scalability, and powerful performance when paired with the Envy Duo 21 hybrid inverter.

What inspired the design of the eBoost system?

MD: We took everything installers loved about the eForce and compacted it into a monolith battery while also bridging the capacity gap between 9.6 kWh and 19.2 kWh. A major goal was solving market pain points around complex hardware, external wireways, and long install times. With eBoost, we wanted a clean, fast, and scalable install that looks as good as it performs.

How does eBoost’s scalable design work, and why is scalability so important today?

MD: eBoost is ideal for residential backup, partial or whole-home loads, small businesses, and customers seeking energy independence. When paired with the Envy Duo, installers can support on-grid, off-grid, net metering, export, self-consumption, TOU shifting, and peak shaving applications.

How does eBoost simplify installation and commissioning? 

MD: Traditional DC systems often require wireways, busbars, and third-party components that eat up space and add cost. With eBoost, we combined cable management, safety hardware, scalability, and clean design into one product. The result is a faster, cleaner, and more professional-looking install right out of the gate.

Real-world performance matters. How does eBoost handle weather and durability?

MD: eBoost includes built-in heating elements that automatically engage at 32°F, ensuring optimal performance in cold climates. The system also carries a 10-year warranty with 70% end-of-life capacity, reflecting Fortress Power’s long-term confidence in the cell architecture and thermal design.

How does eBoost integrate with the Envy Duo 21 inverter, and what does that pairing deliver?

MD: With a 250A discharge rating, eBoost is a perfect match for the Envy Duo 21. This allows homeowners to power multiple heavy loads simultaneously and without compromise. Together, they deliver a high-power, whole-home solution with seamless communication and control.

What makes eBoost stand out in terms of safety and reliability?

MD: It comes down to premium LFP cell architecture, rigorous testing, and compliance with evolving UL 9540 and NFPA 855 standards. Fortress Power never cuts corners for cost. As the industry pushes for higher output and tighter safety requirements, eBoost meets those demands without sacrificing longevity or reliability.

How does eBoost compare to other Fortress products like eForce or eFlex?

MD: It’s actually closer to the eVault Max in terms of power, but in a more compact form factor. It offers the muscle of a higher-capacity system with the simplicity of a slim, garage-friendly design. You can literally wheel it into place and be on your way to energy freedom.

Looking ahead, how will eBoost shape the future of residential and light commercial storage?

MD: The future of energy storage is scalable, flexible, and installer-friendly. As more homeowners pursue backup power, utilities tighten export rules, and policies evolve, systems must adapt without complicating the installation. eBoost sets the stage for that future, giving one platform the ability to grow, integrate with smarter controls, and support both grid-tied and off-grid living. We see eBoost becoming the go-to solution for modern backup systems and distributed energy networks.

Why Choose Fortress Power’s eBoost ESS?

With high-power output, streamlined installation, flexible scalability, and all-climate durability, eBoost delivers a smarter, faster path to energy independence. Whether your customers need backup power, partial-home support, or scalable off-grid capability, eBoost and the Envy Duo pairing offer a reliable, future-ready solution. Contact us today to learn how the eBoost and Fortress Power can transform your energy storage needs.