5MWh Battery Storage Container (eTRON BESS) - AceOn Group

BATTERY ENERGY STORAGE

5MWh Battery Storage Container
(eTRON BESS)

eTRON BESS 20ft 5MWh Battery Container

AceOn offer one of the worlds most energy dense battery energy storage system (BESS). Using new 314Ah LFP cells we are able to offer a high capacity energy storage system with 5016kWh of battery storage in standard 20ft container. This is a 45.8% increase in energy density compared to previous 20 foot battery storage systems.

The 5MWh BESS comes pre-installed and ready to be deployed in any energy storage project around the world. We can offer flexible deployment of multiple battery containers supporting both back-to-back and end-to-end installations. The battery container is compatible with the leading global inverter manufacturers such as SMA & Power Electronics with up-to 2.5MW of power per battery container.

The cutting edge thermal design enables less than 4-degree system-level temperature difference therefore keeping the battery cells at optimum temperatures and therefore being to operate between -30 to +50 degree Celsius.

The energy storage system incorporates multiple safety design features including a system controller, short circuit protection, rack level lockable disconnect, water based suppression system, intrusion detection system and fire detection and suppression ultimately meaning we can offer NFPA 855 compliance. The BESS has the following certification; IEC61000, IEC60730, UN3536, IEC62619, UL1973, UL9540A & UL9540 (pending).

Download AceOn eTRON 5MWh Liquid Cooled BESS Container Datasheet

System Specifications

Item	Specification
System Model	BESS-MSL-7618
System Information
Nameplate Capacity	5015.96kWh
Nominal Power	2500kW
Battery Information
Battery Chemistry	LFP
Capacity	314Ah
Configuration	416S12P
Nominal Voltage	1331.2V
Voltage Range	1164.8-1497.6V
Working Conditions
Degree of Protection	IP55
Noise Emission	<80dB@1m
Operating Temperature Range	-30~50°C
Relative Humidity	0~95%RH (No Condensing)
Max. Working Altitude	3000m
General Information
Dimensions (W×H×D)	6058×2896×2438mm
Weight	40300±500kg
Cooling Method	Intelligent Temperature-controlled Liquid Cooling
Fire Suppression System	Dry pipe / Gas Detection and Ventilation / Clean Agent Suppression (optional)
Aux. Power Supply	AC400V / 3P4L
Communication Protocol	Modbus TCP/IP
Certificate	UL1973, UL9540A, IEC62619, IEC63056, IEC61000, UN38.3, UN3536 (pending)

eTRON BESS Detailed Specifications - AceOn Group

Technical Specifications

Liquid Cooling Battery Container Specification

Parameter	Specification
System Information
Max. power	2.5MW
Nameplate Capacity	5.015MWh
Battery Information
Battery Chemistry	LFP
Type	314Ah
Configuration	1P416S12P
Number of Racks	12
Number of Modules per Rack	4
Nominal Voltage	1331.2V
Voltage Range	1164.8~1497.6V
Depth of Discharge	97.5%
Protections and Safety Devices
Rack Level Lockable Disconnect	Yes
Short Circuit Protection	Yes
Lightning Protection	Yes
Over-charge / Over-discharge Protection	Yes
Over-temperature Protection	Yes
Fire Detection	Yes
Intrusion Detect System	Yes
External Accessible E-stop	Yes
Local Controller	Yes
Uninterruptible Power Supply (UPS)	Backup for 30min
Working Conditions
Degree of Protection	IP55
Noise Emission	≤ 80dB @1m
Operating Temperature Range	-30°C ~ 50°C
Relative Humidity	0~95% (Non condensing)
Max. Working Altitude	3000m
Seismic Zone	Zone-4
Wind Load	120mph / 49.9m/s
Snow Load	40psf / 1.91×10⁻³kPa
General Information
Cooling Concept	Liquid Cooling
Communication Interface	Ethernet
Communication Protocol	Modbus TCP/IP

Battery Components - eTRON BESS - AceOn Group

System Architecture

Battery Components

AceOn Battery storage systems rely on advanced Lithium Phosphate (LFP) chemistry to provide a combination of high power performance, low cost, and industry-leading safety. Due to advancement in latest cell technology the 3.2V 314Ah prismatic cells (increase on previous 280Ah) became AceOn's best pick for a battery storage solution. Cell specifications as follows.

Advanced features of cells are:

Lower fire risk, no explosion risk, higher safety
Advanced thermal design
Active protection: short circuit, over-charging, over-discharging, high temperature, extrusion, and other safety features
Safety Vent (in the middle of 2 pole of cell)
Metal protected against corrosion, be made of alumimum
Self-discharge rate: Per month ≤3.0%

Cell Specifications

Item	Unit	Specification
Battery Chemistry	-	LFP
Shape	-	Prismatic
Dimension (W×D×H)	mm	174.7×71.7×207.1
Weight	kg	5.45±0.3
Nominal Capacity	Ah	314
Nominal Energy	Wh	1004.8
Nominal Voltage	Vdc	3.2
Operating Voltage	Vdc	2.8~3.6
Operating Temperature Range	°C	Charge: 0~60; Discharge: -20~60
Storage Temperature	°C	-30~60
Storage Humidity	%	<85

Modular design which allows for customized configurations, ease of maintenance, and future expansion capability. Modules are formed by configuring 104 of LFP cells in series connection. Modules connected with a battery management system (BMU) to form a rack-mountable module assembly. Multiple module assemblies are then combined into a rack. Each rack contains rack-level BMS.

The positive and negative interface of the battery modules are provided with obvious marks, are convenient to connect, visual check, examine and repair; The positive sign of the battery module is "+" and the negative sign is "-". The external contact surface of the battery module is covered by insulating material (Metal protected against corrosion, the top cover is made of PP, the bottom is made of aluminum.

Specification of Battery Module

Item	Unit	Specification
Configuration	-	1P104S
Key Component	-	104 cells, 1 module BMU
Dimension (W×H×D)	mm	790×250×2200
Weight	kg	650±10
Nominal Capacity	Ah	314
Nominal Energy	kWh	104.5
Nominal Voltage	Vdc	332.8
Operating Voltage	Vdc	291.2~374.4
Maximum Power	kW	52(0.5CP)
Storage Temperature	°C	-30~60
Storage Humidity	%	≤95

There are 9 layers in each battery frame to accommodate 8 modules and 1 BSPU (Battery Switch & Protective Unit). Every 4 modules are connected in series as a rack to the DC bus.

Each battery Rack is with 416 battery cells in series with switch-disconnector, contactor, detective unit, sampling line, battery management systems, control unit, etc.

Specification of Battery Rack

Item	Unit	Specification
Configuration	-	1P416S
Number of Modules	EA	4
Key Component	-	4 modules, 1 BSPU
Switchgear Position	-	Middle
Cooling System	-	Liquid cooled
Weight	kg	3160
Nominal Capacity	Ah	314
Nominal Energy	kWh	418.00
Nominal Voltage	V	1331.2
Operating Voltage	V	1164.8~1497.6
Operating Temperature Range	°C	-30~50
Recommended Operating Temp.	°C	25±3
Storage Temperature	°C	-30~50
Storage Humidity	%	≤95

There are 12 battery racks in each 20ft battery container. All racks are connected in parallel and paired with a system BMS to meet the power and energy requirements of the application at hand.

Specification of Battery Container

Item	Unit	Specification
Container Size	-	20ft
Configuration	-	1P416S12P
Number of Racks	-	12
Cooling System	-	Liquid cooled
Weight	t	43
Nominal power	kW	2500
Nominal Energy	kWh	5015.962
Nominal Voltage	V	1331.2
Operating Voltage	V	1164.8~1497.6
Operating Temperature Range	°C	-30~50
Recommended Operating Temp.	°C	25±3
Storage Temperature	°C	-30~50
Storage Humidity	%	≤95
Degree of Protection	-	IP54
DC Combiner	-	Busbar combiner
AC Aux. Power Supply	-	400V AC 3P4L should be provided by the Client
FSS System	-	Fire suppression and detection system
Cooling System	-	1 set of liquid cooling system with 60kW cooling capacity

Battery Container Internals

System BMS - eTRON BESS - AceOn Group

Intelligent Control

System BMS

BESS employs a sophisticated, multilevel battery management system (BMS) for system monitoring and control. Each battery management system including:

Module Battery management unit (BMU)
Rack Battery Management controlling System (RBMS)
System-level BMS (SBMS)

At the lower level is the Module BMS (BMU), which is designed to detect voltage, temperature, and execute cell balance functions for cells. The rack BMS (RBMS) can manage all module BMS units and detects total voltage, current, and executes protection functions by switching DC-contactor.

Finally, a system-level BMS (SBMS) manages rack BMS units and communicates with PCS or EMS. The table below outlines BMS units of the system

Architecture of System BMS

BMS major functionality as shown in the following table.

Functionality	BMU	RBMS	SBMS
Measurement
Cell Voltage	✓
Cell Temperature	✓
Rack Voltage		✓
Rack Current		✓
Calculation
SOC		✓	✓
SOH		✓	✓
Power Prediction		✓
Control
Contactor Control		✓
Cell Balancing	✓	✓
Communication
CAN2.0	✓	✓
RS485			✓
Ethernet			✓

Auxiliary Equipment - eTRON BESS - AceOn Group

Supporting Systems

Auxiliary Equipment

Auxiliary equipment Includes System Controller, DC combiner, Auxiliary Power Supply Panel, and liquid cooling system.

All the auxiliary equipment will be designed and installed inside the battery container. It serves several functions in the system:

Battery Combiner

The main function of the battery combiner is to combine multiple racks of batteries to one DC bus, then connect to the DC input of PCS via bottom entry.

Auxiliary Power Supply

With input connections, switches, connectors, UPS, and auxiliary power connection to the auxiliary loads (BMS, module fans, liquid cooling system, FSS, etc.). And the UPS will be designed for the BMS and control system.

Communication Combiner

Through the connections to the BMS, cooling system, FSS, and other internal equipment, then combine them to the System Controller for control integration.

Battery System Controller - eTRON BESS - AceOn Group

Central Intelligence

Battery System Controller

To offer one universal communication interface for battery systems with SCADA or EMS and release EMS from basic system protection, AceOn deploys a system controller as part of the BESS integration.

Key Features

Control integration of the battery system (include battery BMS, cooling units, BCP, PCS etc.)
Offer a universal interface for communication between battery systems and SCADA or EMS.
Supports RS-485, CAN, dry contact, Ethernet communication and easy integration
Data logging (short period) for trouble shooting
Remote firmware updating

Specification of Battery System Controller

Item	Specification
Power Supply	DC 12~24V
Total Power Consumption	≤25W
Processor	Cortex®-A53
Frequency	1.1GHz
M.2 SSD	1 channel, 256GB
Operating System	Ubuntu-20.04
RS485	8 channels, baud rate 1200bit/s, 2400bit/s, 4800bit/s, 9600bit/s, 19200bit/s, 38400bit/s, 115200bit/s
RS232	3 channels, baud rate 1200bit/s, 2400bit/s, 4800bit/s, 9600bit/s, 19200bit/s, 38400bit/s, 115200bit/s
Ethernet	4 channels 1000M adaptive
CAN	3 channels
TF Card Interface	1 channel
USB Host	2 channels
State Input	18 channels, Input circuit adopts opt coupler isolation
Passive Dry Contact	8 channels, Output circuit adopts relay isolation
RTC Clock	Yes
Independent Hardware Watchdog	Yes
Communication Protocol	Modbus-RTU, Modbus-TCP
Operating Temperature Range	-30°C ~ +60°C
Dimensions (W×H×D) /mm	232×150×113.2
Relative Humidity	0~65% (noncondensing)
Cooling Concept	Natural Air
Installation Method	Wall mount or rail mount

Liquid Cooling System - eTRON BESS - AceOn Group

Thermal Management

Liquid Cooling System

The liquid cooling system will be designed and installed inside the battery container.

Advantages of Liquid Cooling

Higher Cooling Capability

Compare to air cooling, liquid cooling is capable of taking more heat away from batteries under the same condition. And liquid cooling is the best choice when thermal density is beyond the capability of air cooling.

Better Temperature Uniformity

Cooling liquid has a specific heat capacity which leads to a smaller temperature rise during the cooling process. Therefore, battery cells will have a smaller temperature difference with liquid cooling.

Lower Noise Emission

Without fans on battery modules for air cooling means no noise emission from battery modules.

Working Principle of Liquid Cooling

Battery Cooling

Cooling liquid powered by the pump will circulate inside battery modules and take the heat from batteries. When the liquid gets out of the battery modules, it became hot liquid with the heat from batteries. The hot liquid will circle back to a heat exchanging tank.

Heat Exchanging

Inside the heat exchange tank, the refrigerant will vaporize from liquid state to gaseous state. During this state/phase change process, the refrigerant will absorb a huge amount of heat from the battery cooling liquid and cool down the cooling liquid.

AC Cooling

The rest of the system is a standard Air Conditioner which releases the heat to the environment through the phase change of the refrigerant.

Working Principle of Liquid Cooling

Fire Suppression and Detection System - eTRON BESS - AceOn Group

Safety First

Fire Suppression and Detection System

FSS system of liquid cooled container is designed according to NFPA 72 National Fire Alarm and Signaling Code.

Control Modes

This system has two control modes: automatic and electrical manual.

Automatic Mode

Each protected area is equipped with two independent detection circuits. When the first fire signal issued an alarm to indicate the part of the fire, and to remind staff attention; when the second detector also sends out a fire signal, the automatic fire extinguishing controller starts to enter the delay phase (0-30S adjustable). After the delay, open the solenoid valve, the solenoid valve needle to start the head valve of the storage cylinder, and begin to extinguish the fire, At the same time, the controller receives the feedback signal from the pressure switch, and the control panel spraying indicator is on.

Electrical Manual Mode

When the alarm controller is in manual state, the alarm controller only sends out the alarm signal and does not output the action signal. After confirming the fire alarm by the staff, press the emergency start button on the alarm control panel or the emergency start/stop button at the entrance of the protected area to start the system and spray the extinguishing agent.

Detection Equipment (per 20ft Container)

Smoke Detectors

2 units

Temperature Detectors

2 units

Flammable Gas Detector

1 unit

When one of the smoker or temperature or flammable gas detector alarm, it will cause the alarm bell alarm; when both smoker and temperature detectors alarm, the sound & light alarm will alarm and the fire suppression system will discharge in the meantime.

Water Sprinkler System

Integrated Water Sprinkler Piping System

AceOn provide water sprinkler piping system, inside the battery container there are 5 sprinkler nozzles, which evenly distributed at the centerline position of the battery container.

Talk to one of our battery storage specialists

Navigation

5MWh Battery Storage Container
(eTRON BESS)