Products

Explore Fortress Power Products

Safe. Scalable. Built for Energy Independence.

Fortress Power offers a complete line of energy storage solutions for residential, commercial, and industrial applications — all backed by trusted lithium iron phosphate (LFP) technology and U.S.-based support. From compact battery units to high-voltage C&I systems, you’ll find everything you need to design reliable, long-lasting power systems.

🏠 Residential Energy Storage Solutions

Fortress Power’s residential products are designed to give homeowners clean, reliable energy — whether you’re backing up critical appliances, maximizing your solar investment, or living completely off-grid. Our 48V battery systems and hybrid inverters offer flexible, scalable solutions for every home size and energy need. With safe lithium iron phosphate (LFP) chemistry, intuitive design, and seamless solar integration, Fortress Power makes energy independence simple, affordable, and built to last.

🏢 Commercial & Industrial Energy Storage Solutions

Fortress Power’s C&I product line is engineered to meet the demands of energy-intensive facilities, helping businesses reduce peak demand charges, improve energy resilience, and participate in grid services. With scalable, high-capacity battery systems and commercial-grade inverter solutions, our C&I lineup supports everything from demand charge management to backup power and Virtual Power Plant (VPP) integration. Whether you’re powering a school, warehouse, or small industrial site, Fortress Power delivers reliable, future-ready storage built for performance and efficiency.

All
Residential
C+I
Accessories

eForce Stackable Whole-Home ESS

Modular, stackable whole-home battery system — scalable up to 153 kWh.

eSpire Mini

Fully integrated, pre-configured turnkey solution ranging from 81 kWh to 266 kWh per unit.

eSpire 280

Commercial + Industrial Battery Storage system offering up to 554kWh of capacity.

Keystone EMS

The Keystone EMS cloud platform and microgrid controller secures your energy using advanced tools.

Avalon Energy Storage System

A true all-in-one energy storage system.

Envy True 12kW Inverter

A powerful split-phase hybrid inverter with advanced controls designed for large residential systems.

Envy 8/10kW Inverter

A hybrid inverter designed to simplify residential installations by combining an inverter, battery charger, and transfer switch into a single unit.

eFlex MAX 5.4kWh Battery

Next-Generation Power in a Familiar Size.

eVault MAX 18.5kWh Battery

Our flagship high-capacity battery designed for whole-home backup and long-duration energy storage

Guardian Gateway & Mobile App

Fortress Power’s intelligent monitoring and control solution, designed to give installers and homeowners real-time access to their energy storage system.

Durarack

Fortress Power offers the DuraRack to streamline installation, protect equipment, and maintain a clean aesthetic—whether indoors or outdoors.

FlexTower

The FlexTower combines the battery, charge controller, and inverter into a single unit with an LCD control panel, and remote monitoring capability

✅ Need Help Choosing the Right Products?

From short outages to full off-grid living, Fortress Power systems can be tailored to support everything from your essentials to your entire home. Depending on the battery size and configuration, you can back up: