eSpire Nano Commercial Energy Storage System
Small System. Big System Capabilities.
eSpire Nano Commercial Energy Storage System
Modular, Pre-Configured DC/AC Coupled Energy Storage Solution for Commercial + Industrial Applications
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. Delivered pre-configured with inverters, Lithium Iron Phosphate (LFP) batteries, advanced BMS, and intelligent climate control, the eSpire Nano simplifies installation while supporting a wide range of applications—from peak shaving and load shifting to microgrids, backup power, and VPP participation. With multiple inverter and battery configurations available, the eSpire Nano scales to meet evolving energy and power requirements while delivering long-term performance backed by a 10-year warranty.
Applications
Manufacturing Plants
Grocery and Convenient Stores
Charging Stations and Service Areas
Schools, Banks and Hospitals
Register for our Webinars
eSpire Nano Overview Webinar Series: Everything You Need to Sell & Deploy C&I Storage
Join Fortress Power each month for an ongoing overview webinar series focused on the eSpire Nano — our compact, fast-deploying C&I battery solution designed for small to mid-sized commercial properties. Each session is hosted by a different Fortress Power team member, giving you a variety of perspectives from sales, product, and field expertise.
Sessions begin May 6.
eSpire Nano Technical Webinar Series: A Monthly Deep Dive for Engineers & Installers
Join Fortress Power every month for an ongoing technical deep dive into the eSpire Nano — our compact, modular commercial and industrial energy storage system built for small to mid-sized commercial properties. Each session is hosted by a different member of Fortress Power’s engineering and technical team, bringing you fresh perspectives and expert insights every month.
Sessions begin May 13.
FEATURES
PRODUCT INFORMATION
| AC (Grid Side) | 30kW Inverter | 30kW Inverter | 60kW Inverter |
|---|---|---|---|
| Rated Input Voltage | 208 / 220 / 240 Vac 3P4W | ||
| Rated Current | 72.2 A | 36.1 A | 72.2 A |
| Max Current Passthrough | 144.4 | 72.2 | 144.4 A |
| Max Discharge/Charge Current | 72.2 A | 36.1 A | 72.2 A |
| Rated Input Frequency | |||
| Input Frequency Range | |||
| Grid Power Factor | |||
| THDI | |||
| Input – Generator | |||
| Max Output Power | 26 / 27.5 / 30 kW | 30 kW | 60 kW |
| Max Input Current | 72.2 A | 36.1 A | 72.2 |
| Rated Input Voltage | 208 / 220 / 240 Vac 3P4W | ||
| Rated Input Frequency | |||
| Output – AC (Backup) | |||
| Rated Output Power | 26 / 27.5 / 30 kW | 30 kW | 60 kW |
| Max Apparent Output Power | |||
| Backup Switch Time | |||
| Rated Output Voltage | 208 / 220 / 240 Vac 3P4W | ||
| Rated Frequency | |||
| Rated Output Current | 72.2 A | 36.1 A | 72.2 |
| Max Imbalance Power Per Phase | |||
| THDv (@linear load) | |||
| PV side parameters | |||
| Max. usable PV input power | 60 kW | ||
| Rated MPPT Voltage | |||
| Operating MPPT voltage range (DC) | |||
| Maximum Input Voltage (DC) | |||
| Start-up Voltage (DC) | |||
| Full Load MPPT Voltage Range (DC) | 500 – 850 V | ||
| Max. input current per MPPT | 3 x 42 A | ||
| MPPT number / Max. input strings number | 3/6 | ||
| Max input power per MPPT | |||
| DC Battery | 40 kWh | 60 kWh |
|---|---|---|
| Rated Battery Capacity | 40 kWh | 60 kWh |
| Battery Type | ||
| Nominal Capacity | ||
| Pack Configuration | 1P128S | 1P192S |
| Rack Configuration | 8 | 12 |
| Nominal Energy (kWh) | 40.96 kWh | 61.44 kWh |
| Nominal Voltage | 409.6Vdc | 614.4Vdc |
| Operating Voltage Range (Vdc) | 358.4 – 460.8 Vdc | 537.6 – 691.2 Vdc |
| Max Discharge/Charge Current | ||
| Inverter Efficiency | 97.80% |
| DC-DC Round Trip Efficiency | 97.80% |
| Max Inverter Parallel Numbers | 6 |
| Weight with inverter (40kWh / 60kWh) | 1,940 Ib (880 kg) / 2,381 Ib (1080 kg) |
| Cooling and Heating Mode | HVAC |
| Battery Cabinet Dimension (W x H x D) without inverter | 28.93 x 87.40 x 44.29 in (735 x 2220 x 1125 mm) |
| Inverter Dimension (W x H x D) | 22.04 x 36.61 x 12.60 in (560 x 930 x 320 mm) |
| Operation Altitude | 8,202 ft. (2,500 m) |
| Operation Temperature | -4°F – 122°F (derating >113°F) (-20°C – 50°C (derating >45°C)) |
| Operation Humidity | 0 – 95% |
| Noise Level | ≤ 75dB @ 3.28 ft (1 m) |
| Enclosure Degree of Protection | IP55 (IP20 w/ indoor option) |
| Anti-Corrosivity Category | C4 |
| Fire Protection | BMS pre-alarm, Smoke sensor, temp. sensor, Aerosol, gas sensor & exhaust fan (optional) |
| Auxiliary Power Supply | External power supply (208~240Vac or 480Vac VL-L) |
| EMS (Optioanl) | Adaptive Peak Shaving, Demand Response, VPP, Back-up, Microgrid, Off-Grid |
| Communication | CAN, RS485-115200, Ethernet, Optional: Wi-Fi, Cellular, LAN |
| Certification | UL1973, UL9540A, UL9540, UL1741, FCC Part 15, IEEE 1547, UN38.3 |
| Warranty | 10 years, 70% Retention with 8000 cycles |
| User interface | HMI, Homeowner/Installer Application, Fleet Manangement Portal, Real-time Monitoring, |
PACKAGE CONFIGURATIONS
eSpire Nano Standard Package (Included at ZERO additional cost)
Rapid deployment with guided commissioning in under 10 minutes — ideal for straightforward C&I deployments.
Monitoring capability and/or system functionality is limited to the default functionality of the ESS with its standard equipment.
eSpire Nano Pro EMS Package (Available for an additional cost)
Advanced optimization and enterprise-grade fleet management for maximum ROI. Everything in the Standard Package plus:
Enterprise Features
VPP Integration +Utility Compliance Reporting
Pro EMS pricing includes: Software License + Keystone Controller Package + eGauge Package. 20 hours of technical support included on Tier 2. Keystone Controller outdoor cabinet also available for additional cost
VIDEO LIBRARY
eBoost ESS Video Library
1:24
0:38
Keystone EMS
The Keystone EMS cloud platform and microgrid controller secures your energy using advanced tools, including:
- Automated scheduling and controls
- Integrated controls for solar, storage, EV charging, generators, and other devices
- Real-time insights and monitoring
- O&M reporting and alarming tools
- Scalable from individual projects to portfolios of assets
