As energy demands continue to grow across commercial facilities, businesses need energy storage systems that are powerful, adaptable, and easy to deploy. Many traditional commercial battery systems are large, complex, and time-consuming to install—creating barriers for smaller commercial sites that still need reliable energy management.

The eSpire Nano changes that.

Launching Summer 2026, the eSpire Nano from Fortress Power is a compact, modular commercial battery energy storage system (BESS) designed specifically for small and medium commercial & industrial (C&I) environments. It combines commercial-grade performance with residential-speed commissioning, allowing installers to deploy systems faster while helping businesses take greater control of their energy.

What Is the eSpire Nano?

The eSpire Nano is a compact, outdoor-rated commercial battery system designed for distributed energy projects and small to mid-sized commercial properties.

Unlike large containerized energy storage systems that require extensive infrastructure, Nano is engineered with a simplified modular architecture that significantly reduces installation time and system complexity.

This streamlined design enables projects to be deployed up to three times faster than traditional container-based systems, making commercial energy storage more accessible for a broader range of facilities.

When paired with Keystone Energy Management System (EMS), Nano intelligently optimizes how energy is stored and used based on utility rates, demand charges, and facility load profiles.

Built for Real-World Commercial Environments

Many commercial energy storage solutions are designed primarily for large-scale industrial or utility deployments. The eSpire Nano is purpose-built for smaller commercial environments that still require advanced energy management capabilities. Typical use cases include:

• Retail locations
• Quick Service Restaurants (QSR)
• Small industrial facilities
• Offices and warehouses
• Schools and campuses
• Agricultural operations
• Fuel stations
• Microgrids
• Distributed energy portfolios

Its compact footprint and flexible architecture allow Nano to be installed in locations where traditional systems may be impractical due to space or infrastructure constraints.

Commercial Energy Applications

The eSpire Nano supports a wide range of commercial energy strategies that help businesses manage costs, improve resiliency, and adapt to changing grid conditions.

• Supported applications include:
• Self-consumption optimization
• Backup power protection
• Export control for grid compliance
• Off-grid operation
• Microgrid integration
• Peak demand shaving
• Time-of-use energy optimization
• Smart load control

These capabilities allow businesses to reduce reliance on the grid while capturing greater value from their energy systems.

Built For Faster Commercial Deployments

Speed and simplicity are critical when deploying energy infrastructure at commercial sites. The eSpire Nano is designed to streamline the entire installation and commissioning process. Its compact, modular design reduces installation complexity, helping contractors complete projects faster while lowering total system costs. Installers can commission systems in under 10 minutes using a guided commissioning app, dramatically reducing the time required to bring systems online.

The system also integrates easily with solar installations thanks to AC or DC coupled flexibility, allowing developers to deploy it across both new and existing energy systems.

Key Features of the eSpire Nano

The Nano platform includes several features designed to simplify installation while supporting advanced commercial energy management.

Commission System in Less Than 10 Minutes
A guided commissioning app allows installers to configure systems quickly and bring them online in just minutes.

Built-In Rapid Shutdown Transmitter
Nano includes a module-level rapid shutdown transmitter to simplify integration and meet safety requirements.

AC or DC Coupled Flexibility
Supports both AC-coupled and DC-coupled configurations for seamless solar integration.

Compact Commercial Footprint
Designed for tight commercial environments where space is limited.

Multi-Voltage Compatibility
Supports common commercial voltage environments including 208V, 220V, 240V, and 480V.

Smarter Energy Optimization with Keystone EMS

The Keystone Energy Management System (EMS) unlocks advanced energy optimization across commercial operations. Keystone continuously analyzes facility energy patterns, utility pricing structures, and demand charges to intelligently control how stored energy is used throughout the day. By automatically responding to changing energy conditions, the platform helps businesses:

• Reduce peak demand charges
• Increase solar self-consumption
• Improve operational resilience
• Maximize return on energy investments

This intelligent energy management enables facilities to adapt to changing grid conditions while maintaining reliable, cost-efficient operations.

Proven C&I Track Record + White-Glove Service

The Nano platform is built on Fortress Power’s extensive experience deploying commercial and industrial energy storage systems across diverse industries. Projects are supported by dedicated technical experts who assist throughout the project lifecycle—from design guidance to system commissioning. This ensures commercial customers and installers have the resources they need for successful deployments.

Your Gateway to the C&I Energy Storage Market

For installers and energy developers looking to expand into commercial projects, Nano provides a simplified pathway into higher-margin C&I energy storage installations. By combining commercial-grade performance with installation simplicity, Nano helps teams confidently scale their business into new market opportunities.

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The next phase of commercial energy storage requires systems that are powerful, adaptable, and practical to deploy. The eSpire Nano brings those elements together in a platform designed to simplify installation while delivering the performance commercial environments demand. For installers, developers, and businesses looking to expand into distributed energy storage, Nano opens the door to faster deployments and new project opportunities.

Coming soon. Discover more about the eSpire Nano here.