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April 2026

Fortress Power Launches eSpire Nano: A Compact, High-Performance Energy Storage System for Small & Medium Commercial Applications

Press Release

Compact, Scalable Energy Storage Delivering Commercial Performance with Fast, Installer-Friendly Deployment

Langhorne, PA – April 27, 2026: Fortress Power, a leading manufacturer of advanced energy storage solutions, today announced the launch of the eSpire Nano, a compact and intelligent energy storage system designed specifically for small to medium-sized commercial and industrial (C&I) applications. Engineered to deliver commercial-grade performance with the simplicity and speed of residential systems, the eSpire Nano provides a scalable and cost-effective solution for businesses seeking energy resilience, savings, and control.

Purpose-built for applications such as retail stores, quick-service restaurants, small industrial facilities, offices, and schools, the eSpire Nano offers flexible system configurations across 208V, 220V, 240V, and 480V, along with both AC and DC coupling capabilities. Each system is powered by inverters delivering 30 kW or 60 kW of AC output, paired with 40 kWh or 60 kWh battery cabinets, enabling tailored solutions for a wide range of project sizes and energy demands. With both indoor and outdoor installation options and a compact footprint, the system is ideal for space-constrained commercial environments.

The eSpire Nano was designed to remove traditional barriers to commercial energy storage adoption. Its simplified architecture reduces installation time and overall project cost, while its modular design allows for easy scalability across distributed energy applications. Commissioning is completed through an intuitive, app-based workflow, giving installers, especially those transitioning from residential solar, the ability to confidently enter the C&I market without added complexity.

Key Features of the eSpire Nano:

  • Simplified, compact design reduces installation time, cost, and footprint
  • Modular architecture adaptable to small commercial and distributed energy projects
  • Reduced commissioning with intuitive, app-based setup
  • Keystone EMS integration for advanced energy optimization and maximum ROI
  • Standard and Pro package options to match project complexity and performance needs
  • Proven C&I performance backed by white-glove technical support

To support a wide range of project needs, the eSpire Nano is available in two package options. The Standard package enables rapid deployment with a guided, step-by-step commissioning experience, making it ideal for straightforward installations. The Pro package unlocks advanced capabilities including system modeling, financial analysis, complex utility rate optimization, detailed reporting, and Virtual Power Plant (VPP) participation, along with extended support options for more sophisticated projects.

Backed by Fortress Power’s proven track record in commercial energy storage, the eSpire Nano is supported by dedicated, white-glove technical service from system design through commissioning. This ensures that installers and partners have the resources and expertise needed to deliver successful, high-performing projects in the field.

“The eSpire Nano represents a major step forward in making commercial energy storage more accessible,” said Jing Yu, CEO of Fortress Power. “We’ve combined the performance and intelligence required for commercial applications with the speed and simplicity installers expect from residential systems. This creates new opportunities for installers to grow their business and for more businesses to take control of their energy future.”

For documentation and compliance, the eSpire Nano inverter is approved for inclusion on the California Energy Commission (CEC) Solar Equipment List, with listings for the battery and complete energy storage system expected soon. The system also carries multiple UL certifications, and comprehensive product documentation is readily available for installer partners.

The introduction of the eSpire Nano expands Fortress Power’s growing portfolio of commercial and industrial solutions, reinforcing the company’s commitment to delivering scalable, intelligent energy systems that support resilience, cost savings, and grid independence.

For more information about the eSpire Nano and Fortress Power’s complete suite of products, visit www.fortresspower.com.

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Headquartered in Langhorne, PA, Fortress Power is a global leader in designing and manufacturing advanced Lithium Iron Phosphate (LFP) battery energy storage systems for residential, commercial, and industrial applications. The company operates across North America, the Caribbean, Central America, and Asia. With award-winning local live technical support and partnerships with leading financial institutions, Fortress Power makes investing in solar and storage simple, accessible, and highly reliable.

Media Contact:
Anthony Pingicer
Marketing Director
Fortress Power
[email protected]
877-497-6937

DIY Solar Done Right: Choosing a Battery System That Works

Blog, Solar Batteries

DIY solar is growing for a reason. More homeowners are looking to reduce energy costs, stay powered during outages, and take control of their own systems, without relying entirely on installers.

But here’s the reality: Not every solar battery system is built for DIY. Some are overly complex. Others require multiple platforms just to get up and running. And many aren’t designed with the homeowner in mind at all. If you’re considering a DIY setup, the system you choose matters just as much as the installation itself.

What Makes a Solar Battery System DIY-Friendly?

Before choosing a system, it’s important to understand what actually makes one easier to install and manage. A strong DIY-friendly system should be:

  • Straightforward to install
  • Built as an integrated solution
  • Easy to monitor in real time
  • Scalable as your needs grow

If any of these are missing, the process becomes more complicated than it needs to be.

1) An Integrated System That Works Together

One of the biggest challenges in DIY solar is trying to piece together components that weren’t designed to work as a single system. With Fortress Power, pairing an inverter like the Envy series with storage such as the eBoost 16 kWh battery creates a more streamlined setup. Instead of managing multiple platforms and compatibility issues, you’re working within a system designed to function together from the start. That means:

  • Fewer installation headaches
  • Cleaner system design
  • Less time spent troubleshooting
2) Faster, Guided Setup

Getting a system online is where many DIY projects stall. Fortress Power simplifies this process with guided commissioning, helping walk users through setup step by step. Rather than relying on trial and error, homeowners can follow a structured process that reduces mistakes and speeds up installation.

For DIY users, that clarity makes a big difference.

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3) Real-Time Monitoring That’s Easy to Use

Once your system is running, understanding how it performs is just as important as getting it installed. With the Fortress Power Owner App, homeowners can track:

  • Solar production
  • Battery charge levels
  • Home energy usage
  • Backup status

All in one place. This level of visibility allows DIY users to stay informed and make adjustments as needed, without needing outside support.

4) Built to Scale Over Time

Many DIY systems aren’t built all at once. Homeowners often start with a smaller setup, then expand as their energy needs grow. With scalable options like the eBoost or eForce batteries, Fortress Power systems allow you to add capacity over time without rebuilding your entire system.

That flexibility makes it easier to start now and grow later.

Common DIY Solar Mistakes (and How to Avoid Them)

Even with the right equipment, planning matters. Here are a few common mistakes DIY installers run into:

  • Choosing systems that aren’t integrated
    Leads to compatibility issues and added complexity
  • Undersizing the system
    Not accounting for peak usage or backup needs
  • Skipping monitoring tools
    Limits your ability to track performance and optimize usage
  • Not planning for expansion
    Forces costly upgrades later

Starting with a system designed to work together helps avoid most of these issues from the beginning.

Is a DIY Solar Battery System Right for You?

DIY installation isn’t for everyone, but it can be a strong option if you:

  • Have basic electrical knowledge
  • Prefer a hands-on approach
  • Want to reduce installation costs
  • Are comfortable learning as you go

For many homeowners, it’s not about replacing professionals entirely. It’s about having more control over the process. See how Fortress Power helps homeowners and installers design reliable, scalable energy systems built for independence. Learn more today.

Why Summer Is the Smartest Time to Upgrade Your Solar + Storage System

Blog

Longer days. Higher energy use. More strain on the grid.

Summer isn’t just peak season for sunshine. It’s also when your energy system gets tested the most. Between rising temperatures, increased air conditioning demand, and seasonal storms, homeowners rely more heavily on their power than any other time of year.

That’s exactly why solar paired with battery storage becomes so valuable in the summer months.

More Sun Means More Opportunity

Solar production naturally increases in the summer thanks to longer daylight hours and stronger sunlight. That’s the upside.

The challenge? Without storage, much of that excess energy gets sent back to the grid instead of being used when you actually need it, like in the evening when your home is still cooling down.

Battery storage changes that. Instead of losing unused solar energy, you can store it and use it later — maximizing the value of every kilowatt your system produces.

Beat Peak Energy Costs

Utility rates often spike during the summer, especially during peak demand hours in the late afternoon and evening.

With a battery system in place, you can avoid pulling expensive energy from the grid during those times. Instead, your home can run on stored solar energy, helping reduce your monthly electricity bill without changing your lifestyle.

It’s a smarter way to manage energy, especially when rates are at their highest.

Stay Powered Through Summer Storms

Summer storms can be unpredictable. High winds, lightning, and heavy rain can all lead to outages. Sometimes, when you least expect it. Battery storage provides backup power when the grid goes down, keeping essential systems running:

  • Air conditioning or fans
  • Refrigeration
  • Lighting
  • Internet and communications

Instead of reacting to outages, you’re prepared for them.

Support a More Stable Grid

During extreme heat waves, energy demand can push the grid to its limits. That’s when rolling blackouts or grid instability can occur.

By using stored energy during peak demand times, homeowners with battery storage help reduce strain on the grid. It’s a small shift at the individual level that contributes to a more resilient energy system overall.

Smarter Energy Management, Right From Your Phone

Today’s systems go beyond just storing energy, they give you visibility and control.

With tools like the Fortress Power Owner App, homeowners can monitor solar production, battery levels, and home energy use in real time. That means you can see exactly how your system is performing and make adjustments based on your needs.

Whether you’re home or away, your energy system stays within reach.

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Make the Most of Summer Energy

Summer gives you the highest solar production of the year. Pairing that with battery storage ensures you’re not just generating energy, but using it in the most efficient way possible.

It’s about turning peak production into real savings, real backup power, and real energy freedom.

Ready to get more out of your solar this summer?
Explore how energy storage can help you save more, stay powered, and take control of your home energy.

👉  Find a Fortress Power Installer Near You
👉  Request a Quote to See What Battery Storage Could Look Like for Your Home

How to Commission an eBoost Battery and Envy Inverter Using the Fortress Power Pro App

Blog

Getting a system up and running should be the easiest part of the install.

With the Fortress Power PRO App, commissioning an eBoost battery and Envy inverter is a guided process that takes you from first connection to final setup directly from your phone. No guesswork, just a faster way to bring systems online.

Below, we walk through the full process so you can commission with confidence.

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Before You Start

Make sure your system is fully installed and ready to power on. This setup includes an eBoost battery, Envy inverter, and the Guardian monitoring device, which connects everything and enables app-based setup.

You’ll also need a Wi-Fi or Ethernet connection and the Fortress Power Pro App installed on your phone.

Step 1: Install and Wire the Guardian

Start by installing the Guardian and connecting the required cables.

Key connections:

  • Connect power and communication cables to the inverter
  • For eWay Lite systems, use inverter ports (no DC port available)
  • Insert the Guardian into its designated slot

Wiring tips:

  • Use the DC cable to power the Guardian
  • Connect communication cables between the Guardian and inverter
  • Use the correct wire pins (orange and orange-white)
  • Plug the battery communication cable into any available port
Step 2: Power On the System

Once wiring is complete:

  • Turn the breaker to the energized position
  • Power on the battery (hold the button for 5 seconds)
  • Confirm the LED indicator is active

This will energize the inverter and prepare the system for setup.

Step 3: Connect in the Pro App

Open the Fortress Power Pro App and log in or create an account. If you already have a Guardian or existing system account, you may be prompted to update your password before logging in. To start commissioning:

  • Add a new site
  • Scan for the Guardian via Bluetooth
  • Connect to Wi-Fi or Ethernet
  • Confirm location and system details
  • Register the system to the cloud

Then select your equipment: Inverter: Envy series & Battery: eBoost. From there, the app guides you through the rest of the setup.

Step 4: Configure System Settings

The Pro App includes preset configurations to streamline setup. Key settings to confirm:

  • Voltage: Match your system (e.g., split-phase 120/240V)
  • Application: Grid-tied or off-grid
  • CT rating: Typically 300A for Envy Duo (range: 100–600A)

The inverter will automatically reset after applying these settings.

Step 5: Adjust Battery and Energy Settings

Customize system behavior based on the installation:

  • On-grid cutoff: When the system switches from battery to grid
  • Off-grid cutoff: Typically set around 20% state of charge
  • Grid charging: Enable if needed
  • Export settings: Control energy sent back to the grid
  • You can also configure the generator port or skip it if not used.
Step 6: Complete Commissioning

Once all settings are confirmed:

  • The system will finalize setup
  • Registration to the cloud is completed

Your system is now fully commissioned and ready to operate.

Pro Tips
  • Multiple batteries: Connect the Guardian to the primary battery (not the one with the terminator)
  • Existing setups: Skip guided commissioning if settings are already configured via LCD
  • Voltage checks: Always verify at the panel or consult a licensed electrician.

 

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Need Additional Assistance?

Please visit fortresspower.com/support to submit a ticket and connect with a technical support representative.

Meet the New Fortress Power Mobile Apps: What You Need to Know

Blog

The Fortress Power mobile experience has been updated to give installers and homeowners a faster, more intuitive way to monitor and manage energy systems. With the introduction of the Fortress Power PRO App and Owner App launching April 6th, users now have clearer control, improved visibility, and a more streamlined workflow from installation to everyday use.

If you’re using a Fortress Power system, here’s what to know.

What Are the Fortress Power PRO App and Owner App?

Fortress Power now offers two dedicated mobile apps built for different users:

  • Fortress Power PRO App for installers
  • Fortress Power Owner App for homeowners

Each app is designed to simplify system setup, monitoring, and energy management based on how you use your system.

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Key Features and Benefits

The updated apps improve how you monitor and manage your solar + storage system. Here’s what you can do:

  • Commission and set up systems faster
  • Monitor system performance in real time
  • Navigate a cleaner, more intuitive interface
  • Control energy usage and system settings with ease
How to Update Your App

To ensure uninterrupted access to your system:

  • Download or update via the App Store or Google Play
  • Enable auto-updates when possible
  • Update the app when prompted if you’re running an older version
App Updates and Changes

Here’s what has changed:

  • The Fortress Power Home App is now the Owner App
  • The Installer App is now the PRO App
  • Fortress Power has discontinued the Guardian App
  • The Envy App remains available
Compatibility and System Requirements

To ensure full system functionality:

Firmware Requirements

Check your system before commissioning:

  • No update needed if firmware is version 4.0.16 or higher
  • Update the system if firmware is in the 2.x.x range
  • Update the system if it has been offline or has weak connectivity

Note: Systems below 0.4.45 cannot update through the PRO App

Will This Affect Your System?
  • VPP program participants are not affected
  • Those who participated in our beta testing will receive separate instructions
  • All other users should update their app to continue using their system
A Better Energy Experience Begins Now

Fortress Power’s PRO App and Owner App are built to simplify solar and storage management from installation to daily use. Installers can commission faster, while homeowners get clearer insights and control. The result is a better, more connected energy experience.

Need Support?

Contact the Fortress Power support team for help with updates, setup, or troubleshooting.