Smart Energy Storage Solutions for Homes & Businesses

Whether you’re looking for backup power, off-grid living, or lower electricity bills, Fortress Power systems are designed to keep your home or business running — no matter what.

Become a Fortress Power Certified Installer

Join our nationwide network of professionals and gain the tools, training, and support you need to grow your business with Fortress Power.

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Turn your solar and energy storage into a source of extra income.

Currently available in 15 states plus Puerto Rico, EnergyBroker allows system owners to earn money back through upfront and ongoing incentives from local utility providers.

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Powering Businesses, Facilities & Critical Infrastructure

Fortress Power’s commercial and industrial energy storage systems are engineered to deliver scalable, high-capacity solutions for businesses, schools, healthcare centers, and government facilities, no matter the need.

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Our Vision

To empower individuals, families, and businesses with clean, reliable energy storage solutions that create a more resilient and sustainable world.

Our Mission

To deliver safe, high-performance solar battery systems that reduce energy costs, protect against power outages, and accelerate the transition to renewable energy—backed by industry-leading support and long-term reliability.

About Us

Reliable Solar Energy Storage for a Stronger Future.

From everyday home energy savings to large-scale commercial and industrial resilience, Fortress Power provides the advanced energy storage systems needed to build smarter, more reliable power infrastructure. Our solutions deliver clean energy, dependable backup, and long-term performance—empowering customers of every size to take control of their energy future.

500+

Installer Partners

100+

Distributor Partners

50,000+

Projects Worldwide

Why Choose a Solar Energy Storage System?

Lower Energy Costs With Solar + Storage

A modern energy storage system lets you store excess solar energy during the day and use it when utility rates are highest, dramatically reducing monthly electricity bills and boosting the value of your solar investment.

Sustainable, Clean Energy for Your Home or Business

Storing and using your own solar power reduces your reliance on fossil fuels, cuts carbon emissions, and accelerates your path toward a clean, renewable energy lifestyle.

Reliable Backup Power for Outages

A home battery backup system keeps your lights on, appliances running, and critical circuits powered during blackouts—providing seamless protection from storms, grid failures, and increasingly unstable utility infrastructure.

Energy Independence On or Off the Grid

Whether you’re looking for true off-grid capability or simply greater day-to-day control over your home’s power, an energy storage system gives you long-term energy resilience, freedom, and peace of mind.

Resources for Every Step of Your Energy Journey

Whether you’re installing a new Fortress Power system or exploring clean energy solutions for your home, our resource center gives you quick access to the tools, guides, and support you need.

Installers

Installer Tools

Free online tools built for solar installers, dealers, and DIYers. Size your system, validate your wiring, and calculate your PV string array, all in one place.

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Webinars

Stay up to date with live and on-demand technical training sessions designed to help installers master Fortress Power systems.

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Product Manuals & Documentation

Access detailed installation guides, data sheets, wiring diagrams, and technical documents for every Fortress Power product.

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Support Ticket Submission

Need assistance? Submit a support ticket and our engineering team will help you diagnose, troubleshoot, or configure your system.

Submit a Support Ticket

The Energy Edge Blog

Read expert articles on system design, product updates, best practices, and industry trends to stay ahead in the solar + storage market.

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System Owners

Residential Package Options

Explore preconfigured solutions that show exactly what different battery and inverter packages can power in your home.

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Warranty Programs

Learn about our industry-leading warranty and extended coverage options—designed to protect your investment for decades.

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System Recommendation Tool

Use our interactive tool to estimate your energy needs, size your system, and discover the right Fortress Power solution for your home.

Design Your System

Find a Local Installer

Locate authorized Fortress Power installers and dealer partners near you for professional system design, purchase guidance, and expert installation.

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Newest Products

eBoost Scalable Energy Storage System

The eBoost is a 16kWh stackable LFP battery designed for seamless integration with the Fortress Power Envy Duo 21 inverter — delivering reliable, scalable backup and off-grid energy.

eSpire Nano Commercial Energy Storage System

The Fortress Power eSpire Nano is a turnkey outdoor battery energy storage system (BESS) engineered for commercial and industrial projects that demand reliability, flexibility, and fast deployment.

Solo 6.5K Non-Export Inverter

The Fortress Power Solo 6.5K is a powerful and flexible 6.5kW split/single-phase hybrid inverter designed for off-grid living, backup power, and grid-tied solar systems.

Now Available to Download

Two Apps. One Powerful Energy Ecosystem.

The Fortress Power Owner and Pro apps give homeowners and installers the right tools to monitor, manage, and support Fortress Power systems, anytime, anywhere.

* Available for download on the App Store and Google Play Store as of April 6, 2026.

Don’t just take our word for it

Our reputation speaks for itself. Hear from our certified Fortress Power installers, industry distribution partners and satisfied homeowners and businesses.

I have been loving the Envy and eVault MAX/eFlex combo. Gary of Fortress Power tech support, absolutely has been the best. He is knowledgeable, patient, and just amazing in helping me commission systems and answering any answer that may come up. Wish I had him on speed dial 24/7. Great overall product and team, thanks!

Steven N, Installer

When Sol-Ark would not support closed loop with my E-flex batteries, the Fortress engineers stepped up to give me tools to update my batteries’ software and helped with connecting the closed loop communications. Thanks to all of my friends at Fortress.

Mark

Quality home and commercial American battery manufacturer. They attract talent within their company and are led by a strong management team.

Andrew Breiter-Wu

      
   Fortress Power
   86 Google reviews 
  Write a review 
  
 
 
   
 
 
       Posted on Google  
   
   Energy Solar 
 April 24, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Fortress provided excellent support on our project. Gary Van Oosbree, their engineer, came out to the site and quickly identified and resolved the issue. He guided us step by step and made sure everything was working properly before leaving. Very knowledgeable and professional—really appreciate the hands-on support.
  
 
      Posted on Google  
   
   Karen Romrell 
 April 21, 2026
 
 
 Trustindex verifies that the original source of the review is Google. My tech, Omri Carrasco, is excellent! He's responsive and fixed the problem.
  
 
      Posted on Google  
   
   M Duley 
 April 20, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Fortress Power’s technician Omri was excellent, knowledgeable, professional, and went above and beyond. I could tell immediately he’s really passionate about what he does. He made the whole support ticket process smooth. Highly recommend this technician and the general  support staff of Fortresspower!
  
 
      Posted on Google  
   
   Frank Cooper 
 April 20, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Christopher Rosales was extremely helpful I don't know what I would have done without his help this is like the third time I contacted somebody and he's the only one that took the time to assist me I hope it continues to work well with what he helped and I wish I had a direct way to contact him if I ever needed him again but I know that's usually impossible but his service was supreme I thank him and everybody for all you have done
  
 
      Posted on Google  
   
   Michael Hoyt 
 March 29, 2026
 
 
 Trustindex verifies that the original source of the review is Google. After my Envy 12 with 2 batteries was installed, we had a problem getting the Peak-Shaving option to work properly.  The solution required an upgrade to the firmware that allowed the sytem to be set to off-grid during user specified periods.  Omri Carrasco was extremely helpful during the trouble-shooting process and worked closely with me to find and implement the solution.  I couldn't be happier with my Fortress Power installation.
  
 
      Posted on Google  
   
   Richard Roser 
 March 18, 2026
 
 
 Trustindex verifies that the original source of the review is Google. I'm aPV/Battery installer.  Saul Navarro was very helpful with getting me connected to the batteries, and helping to check the FW. He even noticed the batteries I was working with were a bit out of calibration. He took the time to update them and get my system squared away
  
 
      Posted on Google  
   
   Alberto Aguilar 
 March 18, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Muy satisfecho con el excelente servicio de soporte técnico de Fortress Power México sin dejar atrás la alta tecnología que ofrecen en toda su línea, con un optimo desempeño y arquitectura energética, así como la ingeniería de potencia con la que cuentan los equipos y sistemas desde pequeña a gran escala. Aprovecho la oportunidad para agradecer al Ingeniero Omri Carrasco quien me ha brindado un gran soporte y resaltando en especial que no importando la hora me ayudo con un cliente a resolver un tema técnico de urgencia. Tanto el cliente como un servidor quedamos mas que satisfechos. En Elirmex diseñamos e integramos solo con fabricantes confiables que demuestran en su innovador y constante desarrollo de tecnología estar a la vanguardia del actual creciente e importante sector de la continuidad energética, así que Fortress Power y todo su equipo de ingeniería seguirán siendo referentes en esta gran industria energética.
  
 
      Posted on Google  
   
   Don Jolliff 
 March 13, 2026
 
 
 Trustindex verifies that the original source of the review is Google. Fast and great service.