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

Inverter Specifications
Battery Specifications
General Specifications
Downloads
Diagrams

AC (Grid Side)	30kW Inverter	30kW Inverter	60kW Inverter
Rated Input Voltage	208 / 220 / 240 Vac 3P4W	480 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	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 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	480 Vac 3P4W
Rated Input Frequency	60 Hz
Output – AC (Backup)
Rated Output Power	26 / 27.5 / 30 kW	30 kW	60 kW
Max Apparent Output Power	1.6 times of rated power with 2s
Backup Switch Time	< 10ms
Rated Output Voltage	208 / 220 / 240 Vac 3P4W	480 Vac 3P4W
Rated Frequency	60 Hz
Rated Output Current	72.2 A	36.1 A	72.2
Max Imbalance Power Per Phase	33% rated power
THDv (@linear load)	< 2%
PV side parameters
Max. usable PV input power	60 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 MPPT	3 x 42 A	4 x 42 A
MPPT number / Max. input strings number	3/6	4/8
Max input power per MPPT	25 kW (600 V x 42 A)

DC Battery	40 kWh	60 kWh
Rated Battery Capacity	40 kWh	60 kWh
Battery Type	LFP (Lithium Iron Phosphate)
Nominal Capacity	100 Ah
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	100 A

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,

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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eSpire Nano Commercial Energy Storage System