World-Leading Battery Manufacturer

About Fortress Power

Fortress Power is more than a Pennsylvania-based global leader in lithium battery manufacturing. We’re highly experienced, expertly trained professionals with a passion for renewable energy. Our superior client service and dedication to affordable, premium energy storage products have made us industry leaders with experience serving both private residences and commercial enterprises.

But we don’t just sell energy storage, we sell solutions. Unlike our competitors, Fortress Power is committed to providing our clients with top-performing energy storage solutions that are easily installed, safe, and consistently reliable. Even if you don’t have a solar panel system in place, our energy storage still work for you.

Fortress Power puts our customers first. Working with us means you’ll be partnering with a different kind of energy storage company. We treat you like we treat our team members: intelligently, fairly, and as innovative as we are.

Fortress GO

Fortress Power Advantages

We’re confident we’re a good fit for your energy storage needs, but we want you to find that out for yourself. Contact us to learn more about our innovative, personalized storage solution that grows with you and fits seamlessly into your lifestyle.

High Performance

Latest Technology

We use the safest, environmentally friendly Lithium Ferro Phosphate technology.

Easy to Install

All-in-one Solution

Smart energy management system supports multiple applications.


High Safety Standard

Lowest Cost Per Cycle

Competitively priced, easy to install, and high trip efficiency.


Long Lasting

10 year warranty up to 6,000 cycles

Fortress Power Benefits

Adding Fortress Power Energy Storage to your solar PV systems enables you to maximize the use of your clean solar energy by storing excess solar for use at night.

  • Provide power during grid outages
  • Lower your electrical bill by avoiding having to buy electricity at peak times
  • Enjoy a 30% investment tax credit when incorporating with solar
  • Increase your independence from the utility grid

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We know you want power and we know you want it now. Fortress Power batteries are made from the highest standard lithium ferrite phosphate, meaning they’ll produce significantly higher energy discharges than the standard energy storage solution. Our products can operate at a wider range of temperatures, too.


It’s a fact: Lead acid batteries can release dangerous gases and put you and your loved ones at risk. Since Fortress Power integrates lithium ferrite phosphate technology into each product, we keep your home and business safe, which is our ultimate priority.

6X Longer Life Span

Longer life spans mean a better financial investment for you. Fortress Power’s batteries can operate for up-to 6000 cycles. That’s up to 10 years of high-quality, reliable service. And since our batteries are low maintenance, it’ll remain totally independently operational—like you—throughout its life. Conventional lead batteries? They only last through 500 full cycles. The choice is easy.

No Maintenance

We mean it: Fortress Power batteries require little maintenance, so you can install your battery and never have to worry. Traditional lead batteries require service every 3-6 months. Should you ever have a question during your battery’s life, our professional team is here to help.

Compact & Light

We proudly offer batteries that are one-third the size of conventional lead-acid batteries. This means you can store energy without compromising your home or business’s cosmetic appearance. And our portable FortressGo line is disassembled and reassembled in minutes so you can take your power anywhere.

Deep Depth Discharge

Fortress Power’s batteries are cleverly designed to be fully dischargeable. Preserving (and possibly extending) their lifespan, their depth of discharge is preset at 80%, creating 30% more usable energy than lead-acid batteries. You’ll need fewer batteries than our competitors to store the same amount of energy.


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(877) - 497 - 6937