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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

FEATURES

  • Safe Technology & Multi-level Protection

    The solution uses the best-in-class Tier 1 Lithium Iron Phosphate (LFP) chemistry for the highest level of safety, thermal stability, and reliability; An integrated, multi-level Battery Management System (BMS) monitors, optimizes, and balances the system.

  • Adaptive Intelligent EMS / Fleet Management

    Intelligent software to reduce electricity cost, prepare for resiliency, and maximize return on investment. Remote operation and maintenance for multiple sites.

  • Built-in Microgrid Controls

    Ability to integrate with solar, genset, wind, micro-turbines, utility, or other distributed energy resources.

  • Flexible Power & Capacity Configurations

    Available with 40 kWh or 60 kWh battery options and 30 kW or 60 kW inverter configurations, supporting 208 / 220 / 240 Vac (3P4W) or 480 Vac (3P4W) applications. Supports paralleling up to six inverters.

  • Turnkey DC/AC-Coupled Energy Storage

    The eSpire Nano is a fully pre-configured outdoor BESS that integrates inverter(s), LFP batteries, BMS, intelligent climate control, and an integrated STS for enhanced resiliency.

  • Excellent Local Support

    Our US based technical support team can help you from project design to completion.

PRODUCT INFORMATION

AC (Grid Side)30kW Inverter30kW Inverter60kW Inverter
Rated Input Voltage208 / 220 / 240 Vac 3P4W
480 Vac 3P4W
Rated Current72.2 A36.1 A72.2 A
Max Current Passthrough144.472.2144.4 A
Max Discharge/Charge Current72.2 A36.1 A72.2 A
Rated Input Frequency
60 Hz
Input Frequency Range
55 – 65 Hz
Grid Power Factor
> 0.99 (0.8 leading ~ 0.8 lagging)
THDI
≤ 3%
Input – Generator
Max Output Power26 / 27.5 / 30 kW30 kW60 kW
Max Input Current72.2 A36.1 A72.2
Rated Input Voltage208 / 220 / 240 Vac 3P4W
480 Vac 3P4W
Rated Input Frequency
60 Hz
Output – AC (Backup)
Rated Output Power26 / 27.5 / 30 kW30 kW60 kW
Max Apparent Output Power
1.6 times of rated power with 2s
Backup Switch Time
< 10ms
Rated Output Voltage208 / 220 / 240 Vac 3P4W
480 Vac 3P4W
Rated Frequency
60 Hz
Rated Output Current72.2 A36.1 A72.2
Max Imbalance Power Per Phase
33% rated power
THDv (@linear load)
< 2%
PV side parameters
Max. usable PV input power60 kW
100 kW
Rated MPPT Voltage
600 V
Operating MPPT voltage range (DC)
150 – 850 V
Maximum Input Voltage (DC)
1000 V
Start-up Voltage (DC)
180 V
Full Load MPPT Voltage Range (DC)500 – 850 V
600 – 850 V
Max. input current per MPPT3 x 42 A
4 x 42 A
MPPT number / Max. input strings number3/6
4/8
Max input power per MPPT
25 kW (600 V x 42 A)
DC Battery40 kWh60 kWh
Rated Battery Capacity40 kWh60 kWh
Battery Type
LFP (Lithium Iron Phosphate)
Nominal Capacity
100 Ah
Pack Configuration1P128S1P192S
Rack Configuration812
Nominal Energy (kWh)40.96 kWh61.44 kWh
Nominal Voltage409.6Vdc614.4Vdc
Operating Voltage Range (Vdc)358.4 – 460.8 Vdc537.6 – 691.2 Vdc
Max Discharge/Charge Current
100 A
Inverter Efficiency97.80%
DC-DC Round Trip Efficiency97.80%
Max Inverter Parallel Numbers6
Weight with inverter (40kWh / 60kWh)1,940 Ib (880 kg) / 2,381 Ib (1080 kg)
Cooling and Heating ModeHVAC
Battery Cabinet Dimension (W x H x D) without inverter28.93 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 Altitude8,202 ft. (2,500 m)
Operation Temperature-4°F – 122°F (derating >113°F) (-20°C – 50°C (derating >45°C))
Operation Humidity0 – 95%
Noise Level≤ 75dB @ 3.28 ft (1 m)
Enclosure Degree of ProtectionIP55 (IP20 w/ indoor option)
Anti-Corrosivity CategoryC4
Fire ProtectionBMS pre-alarm, Smoke sensor, temp. sensor, Aerosol, gas sensor & exhaust fan (optional)
Auxiliary Power SupplyExternal power supply (208~240Vac or 480Vac VL-L)
EMS (Optioanl)Adaptive Peak Shaving, Demand Response, VPP, Back-up, Microgrid, Off-Grid
CommunicationCAN, RS485-115200, Ethernet, Optional: Wi-Fi, Cellular, LAN
CertificationUL1973, UL9540A, UL9540, UL1741, FCC Part 15, IEEE 1547, UN38.3
Warranty10 years, 70% Retention with 8000 cycles
User interfaceHMI, Homeowner/Installer Application, Fleet Manangement Portal, Real-time Monitoring,

Warranty

Data Sheets

espirenano diagram

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

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