Dyness B4850 Solar Battery Lithium Module 2.4kWh

Statement of Law

Copyright of this document belongs to Daqin New Energy Tech (Taizhou) Co., Ltd.
No part of this documentation maybe excerpted, reproduced, translated, annotated or duplicated in any form or by any means without the prior written permission of Daqin New Energy Tech (Taizhou) Co., Ltd. All Rights Reserved.
This product complies with the design requirements of environmental protection and personal safety. The storage, use and disposal of the products shall be carried out in accordance with the product manual, relevant contract or relevant laws and regulations.
Customer can check the related information on the website of Daqin New Energy Tech (Taizhou)
Co., Ltd when the product or technology is updated.
Web URL：http://www.dyness-tech.com
Please note that the product can be modified without prior notice.

Revision History

revision
1.2| 2019.06.22| 1.System adds DIP switch

1.3

|

2019.07.26

| 1.Update the cable specification and simple bracket installation method
1.4| 2020.07.15| 1.Add battery parameter settings on the inverter. 2.Add DIP setting for ICC.

3.Add register on the website after installation. 4.Update the bracket installation

1.5| 2020.09.27| 1.Add new inverters in DIP switch description

1.6

|

2021.03.24

| 1. Update the description of the DIP setting 2.Delete the description of the non-DIP model
1.7| 2021.09.06| 1. Company information has changed from Jiangsu Daqin to Taizhou Daqin

2. Power cable is changed to optional

3.   Update charge current limit value to 1A in protection mode.

4. Update DIP switch description.

Safety Precautions and maintenance instructions

Warning

• Please do not put the battery into water or fire, in case of explosion or any other situation that might endanger your life.
• Please connect wires properly while installation, do not reverse connect.
• To avoid short circuit, please do not connect positive and negative poles with conductor on the same device.
• Please avoid any form of damage to battery, especially stab, hit, trample or strike.
• Please shut off the power completely when removing the device or reconnecting wires during the daily use or it could cause the danger of electric shock.
• Please use dry powder extinguisher to put out the flame when encountering a fire hazard, liquid extinguisher could result in the risk of explosion.
• For your safety, please do not arbitrarily dismantle any component in any circumstances. The maintenance must be implemented by authorized technical personnel or our company’s technical support. Device breakdown due to unauthorized operation will not be covered under warranty.

Caution

• Our product have been strictly inspected before shipment. Please contact us if you find any abnormal phenomena such as device outer case bulging.
• The product shall be grounded properly before use In order to ensure your safety.
• To assure the proper use please make sure parameters among the relevant device are compatible and matched.
• Please do not mixed-use batteries from different manufacturers, different types and models, as well as old and new together.
• Ambient and storage method could impact the product life span, please comply with the operation environment instruction to ensure device works in proper condition.
• For long-term storage, the battery should be recharged once every 6 months, and the amount of electric charge shall exceed 80% of the rated capacity.
• Please charge the battery in 18 hours after it fully discharged or over-discharging protection mode is activated.
• Formula of theoretical standby time: T=C/I (T is standby time, C is battery capacity, I is total current of all loads).

Preface

Manual declaration

B4850 lithium iron phosphate battery energy storage system can provide energy storage for photovoltaic power generation users through parallel combination. Our product can store extra electricity into battery from photovoltaic power generation system in daytime and supply stable power to user’s equipment as power backup at nighttime or any time when needed. It can improve the efficiency of photovoltaic power generation and increase the electric power efficiency by peak load shifting.

This user manual details the basic structure, parameters, basic procedures and methods of installation and operation and maintenance of the equipment.

Introduction

Brief Introduction
B4850 lithium iron phosphate battery system is a standard battery system unit, customers can choose a certain number of B4850 according to their needs, by connecting parallel to form a larger capacity battery pack, to meet the user’s long-term power supply needs. The product is especially suitable for energy storage applications with high operating temperatures, limited installation space, long power backup time and long service life.

Product Properties
B4850 energy storage product’s anode materials are lithium iron phosphate, battery cells are managed effectively by BMS with better performance, the system’s features as below:

• Comply with European ROHS, Certified SGS, employ non-toxic, non-pollution environment friendly battery.
• Anode materials are lithium iron phosphate (LiFePO4), safer with longer life span.
• Carries battery management system with better performance, possesses protection function like over-discharge, over-charge, over-current, abnormal temperature.
• Self-management on charging and discharging, Single core balancing function.
• Intelligent design configures integrated inspection module.
• Flexible configurations allow parallel of multi-battery for longer standby time.
• Self-ventilation with lower system noise.
• Less battery self-discharge, then recharging period can be up to 10 months during the storage.
• No memory effect so that battery can be charged and discharged shallowly.
• With wide range of temperature for working environment, -20℃ ~ +55 ℃, circulation span and discharging performance are well under high temperature.
• Less volume, lighter weight.

Product identity definition
Figure 1-1 Battery Energy Storage System nameplate

• Battery voltage is higher than safe voltage, direct contact with electric shock hazard.
• Be careful with your actions and be aware of the dangers.
• Read the user manual before using.
• The scrapped battery cannot be put into the garbage can and must be professionally recycled.
• After the battery life is terminated, the battery can continue to be used after it recycled by the professional recycling organization and do not discard it at will.
• This battery requirements. product meets European directive
• This battery product passed the TUV certification test.
• Dangerous goods warning label on the top of the battery module

Product Specification

Size and Weight
Table 2-1 B4850 Device size

Product| Nominal Voltage| Nominal Capacity| Dimension| Weight
---|---|---|---|---
B4850| DC48V| 50Ah| 480×360×90mm| ≈22kg

Performance Parameter
Table 2-2 B4850 performance parameter

Interface Definition
This section elaborates the interface functions of the front interface of the device.
Figure2-1 The sketch of interface.

Table 2-3 Interface Definition

the ON state, press and hold this button for 3 seconds to put the battery into the power-on or sleep state. If you need to turn it off, hold down SW 3S and power switch to “OFF”.
6| SOC| The number of green lights on shows the remaining battery power. See Table 2-3 for details.
7| ALM| Red light flashing when an alarm occurs, red light always on during protection status. After the condition of trigger protection is released, it can be automatically closed.
8| RUN| Green light flashing during standby and charging mode.

Green light always on when discharging.

9| CAN/485| Communication port, support CAN/ RS485 communication (factory default CAN communication)
10| DRY CONTACT| /
11| ADD| DIP switch

DIP switch definition and description
Table 2-4 Interface Definition

DIP switch position (master communication protocol and baud rate selection)

1| #2| #3| #4

Define different protocols ； Distinguish between master and slave| Baud rate selection
OFF：CAN: 500K,485: 9600
ON：CAN: 250K,485: 115200

DIP switch description:
When the batteries are connected in parallel, the master communicates with the slaves through the CAN interface. The master summarizes the information of the entire battery system and communicates with the inverter through CAN or 485.

1. If the master is the latest B4850 battery with DIP switch:

1. The communication cable from the master CAN IN to the inverter comm port should be the correct one.

2. When the battery works with GOODWE, Solis, LUX, Sofar, DEYE, VICTRON, IMEON, Sungrow, SMA, RENAC, DELIOS、SAJ(CAN Comm) ,before starting the battery, you need put the master DIP switch “# 3” to the “ON” position (to the top), then turn on the batteries.
   

3. If the battery communicates with the Axpert-king/VMIII/MAX, Infinisolar, Growatt SPH/SPA(CAN comm)、GMDE, turn the master DIP switch “#2” to “ON” position.
   

4. If the battery communicates with the Growatt SPF HVM-P/ES/WPV by RS485 communication, turn the master DIP switch “#2” and “#3” to “ON”.
   

5. If the battery communicates with the Schneider Conext Series, turn the master DIP switch “#1” and “#3” to “ON”.
   

6. When you setup the master DIP as setting 1~4,all the slaves keep the DIP 0000,no need change.

7. If the battery module is in communication with the ICC by 485 communication, turn the master DIP switch “#1” and “#4” to “ON”.
   
   the DIP switch of slaves need to turn the “#4” to “ON” at the same time while the master is setting 5.
   

8. If the energy storage system has only one B4850, it is the master itself, and still follow the above steps.
   Note: For more information of matching inverter brands, please subject to the latest
   document

   .

Caution: The DIP switch mode in case (7),1001 is only for ICC(a special communication device of some no-communication inverter), it’s a special firmware in BMS, different from general firmware, so if customers want to use that, please contact dyness to confirm.

Table 2-4 Pin Definition

Table 2-5 LED status indicators

Battery Status| SOC| LED1| LED2| LED3| LED4| ALM| RUN
---|---|---|---|---|---|---|---
Shutdown| /| off| off| off| off| off| off
Standby| 75%≤SOC≤

100%

| ●| ●| ●| ●| off| Flashing
50%≤SOC＜75%| ●| ●| ●| off| off| Flashing
25%≤SOC＜50%| ●| ●| off| off| off| Flashing
5%＜SOC＜25%| ●| off| off| off| off| Flashing
0%＜SOC≤5%| ●| off| off| off| Flashing| Flashing
SOC=0| off| off| off| off| Flashing/

●

| Flashing
Charging| SOC=100%| ●| ●| ●| ●| off| Flashing
75%≤SOC＜

100%

| ●| ●| ●| Flashing| off| Flashing
50%≤SOC＜75%| ●| ●| Flashing| off| off| Flashing
25%≤SOC＜50%| ●| Flashing| off| off| off| Flashing
0%＜SOC＜25%| Flashing| off| off| off| off| Flashing
Discharging| 75%≤SOC≤

100%

| ●| ●| ●| ●| off| ●
50%≤SOC＜75%| ●| ●| ●| off| off| ●
25%≤SOC＜50%| ●| ●| off| off| off| ●
5%＜SOC＜25%| ●| off| off| off| off| ●
0%＜SOC≤5%| ●| off| off| off| Flashing| ●
SOC=0| off| off| off| off| Flashing/

●

| Flashing

A special ALM light flashing state:when the communication between batteries is lost or abnormal,all the lights from SOC to RUN of the master battery will flash together.
● means green light always on ● means red light always on
Flashing: means green light flashing or red light flashing

Battery Management System(BMS)

Voltage Protection

Low Voltage Protection in Discharging: When any battery cell voltage or total voltage is lower than the protection value during discharging, the over- discharging mode is activated, and the battery buzzer makes an alarm sound. Then battery system stops supplying power to the outside. When the voltage of each cell back to rated return range, the protection is over.

Over Voltage Protection in Charging: Battery will stops charging when total voltage or any battery cell voltage reaches the rated protection value during charging stage. When total voltage or all cell back to rated range, the protection is over.

Current Protection
Over Current Protection in Charging: When the charge current ＞ 45A, current limit protection mode is activated, current will be limited to 4A，protection is removed after rated time delaying 10S. Circulate like this until the current is lower than 45A.
Over Current Protection in Discharging: When the discharging current is greater than the protection value 55A, the battery buzzer alarms and the system stops discharging. Protection is removed after rated time delaying 1min.

Caution:
The buzzer sound alarm setting can be manually turned off on the background software, and the factory default is on.

Temperature Protection
Low/Over temperature protection in charging： When battery’s temperature is beyond range of -5 ℃ ~+55 ℃ during charging, temperature protection is activated, device stops charging.
The protection is over when temperature back to rated working range.
Low/Over temperature protection in discharging： When battery’s temperature is beyond range of -20℃~+55℃ during discharging, temperature protection is activated, device stops supplying power to the outside.
The protection is over when temperature back to rated working range..

Other Protection
Short Circuit Protection： When the battery is activated from the shutdown state, if a short circuit occurs, the system starts short-circuit protection for 60 seconds.
Self-Shutdown： When device connects no external loads and power supply and no external communication for over 72 hours, device will dormant standby automatically.
Caution
Battery’s maximum discharging current should be more than load’s maximum working current.

Installation and Configuration

Ready for installation

Safety Requirement
This system can only be installed by personnel who have been trained in the power supply
system and have sufficient knowledge of the power system.
The safety regulations and local safety regulations listed below should always be followed during the installation.

• All circuits connected to this power system with an external voltage of less than 48V must meet the SELV requirements defined in the IEC60950 standard.
• If operating within the power system cabinet, make sure the power system is not charged. Battery devices should also be switched off.
• Distribution cable wiring should be reasonable and has the protective measures to avoid touching these cables while operating power equipment.
• when installing the battery system, must wear the protective items below:
  

Environmental requirements

• Working temperature: -20 ℃ ~ +55 ℃

• Charging temperature range is 0℃~+55 ℃,

• Discharging temperature range is -20 ℃ ~+55 ℃

• Storage temperature: -10 ℃ ~ +35 ℃

• Relative humidity: 5% ~ 85%RH

• Elevation: no more than 4000m

• Operating environment: Indoor installation, sites avoid the sun and no wind, no
  conductive dust and corrosive gas.

• And the following conditions are met:
  • Installation location should be away from the sea to avoid brine and high humidity
  environment.
  • The ground for product arrangement shall be flat and level
  • There is no flammable explosive materials near to the installation site.
  • The optimal ambient temperature is 15℃ ~ 30 ℃
  • Keep away from dust and messy zones

Tools and data

Hardware tool
Tools and meters that may be used are shown in table 3-1.
Table 3-1 Tool instrument

Name

Screwdriver（Slotted, Phillips）| Multimeter
Torque wrench| Clamp current meter
Diagonal pliers| Insulation tape
Pointed nose pliers| Temperature meter
Pliers to hold the wire| Anti-static bracelet
Stripping pliers| Cable tie
Electric drill| Tape measure

Technical preparation

Electrical interface check
Devices that can be connected directly to the battery can be user equipment, power supplies, or other power supplies.

• Confirm whether the user’s PV power generation equipment, power supply or other power supply equipment has a DC output interface, and measure whether the DC power output voltage meets the voltage range requirements in Table 2-2.

• Confirm that the maximum discharge current capability of the DC power interface of the user’s photovoltaic power generation equipment, power supply or other power supply equipment should be greater than the maximum charging current of the products used in Table 2-2.
  If the maximum discharge capacity of the DC power interface of the user’s photovoltaic power generation equipment is less than the maximum charging current of the products used in Table 2-2, the DC power interface of the user’s photovoltaic power generation equipment shall have a current limiting function to ensure the normal operation of the user’s equipment.

• Verify that the maximum operating current of the battery-powered user equipment (inverter DC input) should be less than the maximum discharge current of the products used in Table 2-2.

The security check

• Firefighting equipment should be provided near the product, such as portable dry powder fire extinguisher.
• Automatic fire fighting system shall be provided for the case where necessary.
• No flammable, explosive and other dangerous product are placed beside the battery.

Unpacking inspection

• When the equipment arrives at the installation site, loading and unloading should be carried out according to the rules and regulations, to prevent from being exposed to sun and rain.
• Before unpacking, the total number of packages shall be indicated according to the shipping list attached to each package, and the case shall be checked for good condition.
• In the process of unpacking, handle with care and protect the surface coating of the object.
• Open the package, the installation personnel should read the technical documents, verify the list, according to the configuration table and packing list, ensure objects are complete and intact, if the internal packing is damaged, should be examined and recorded in detail.

Packing list is as follows:

content/uploads/2023/04/Screenshot_21-53.png)
Power cable- positive| Red / 25mm2 / L2050mm| Optional: If you need, please contact the dealer to purchase|
Power cable- negative| Black/ 25mm2 / L2050mm| Optional: If you need, please contact the dealer to purchase|
Parallel cable- positive| Red / 25mm2 / L215mm| 1|
Parallel cable- negative| Black / 25mm2 / L215mm| 1|
Communication parallel cable| Black / L250mm / Double RJ45 plug| 1|
Communication cable-to inverter| Black / L2000mm  / Double RJ45 plug| 1|
Ground wire| L500mm,4mm²| 1|
User Manual| B4850 User manual| 1|
Screw| Combination screws M6*14| 4|

Engineering coordination
Attention should be paid to the following items before construction:

• Power line specification.
  The power line specification shall meet the requirements of maximum discharge current for each product.

• Mounting space and bearing capacity.
  Make sure that the battery has enough room to install, and that the battery rack and bracket have enough load capacity.

• Wiring.
  Make sure the power line and ground wire are reasonable. Not easy to short- circuit, water and corrosion.

Equipment installation

Table 3-2 Installation steps

Step1| Installation preparation| Confirm that the ON/OFF switch on the front panel of B4850 unit is in the “OFF” state to ensure no live operation.
---|---|---
Step 2| Mechanical installation| 1. Battery placement position determination
2. Battery module installation
Step3| Electrical installation| 1. Ground cable installation
2. Battery module parallel cable installation
3. Parallel communication cable connection
Step4| Battery system self-test| 1. Turn the ON/OFF switch to the “ON” state
2. Press SW button 3S to wake up battery
3. Check the system output voltage and led status
4. Shut down the system
Step5| Connecting inverter| 1. Connect total positive & total negative cable of the battery system to the inverter
2. Battery module total positive cable installation
3. Battery module total negative cable installation
4. Connect the communication cable from the master CAN IN to the inverter
5.Turn on the Power switch and wake up system by SW button
6.Close the DC breaker between inverter and battery
7.Turn on the inverter and check the communication between inverter and battery system

Installation preparation

1. Prepare equipment and tools for installation.
2. Check the B4850 unit and confirm that the ON/OFF switch is in the “OFF” state to ensure the device is shut off..

Mechanical installation
Installation method 1: With Cabinet installation

Note: Cabinet not supplied with batteries. Scope of certification does not include external cabinets.

1. Place the B4850 unit on the cabinet bracket as shown in the figure and push the device into the cabin at the installation position. (The cabinet structure in the figure is for reference only)
   

2. Secure the B4850 unit to the cabinet with a nut through the mounting holes top on the hanging ears of the B4850 unit.
   

3. Clearances required around battery, shown as Figure3-4
   

Installation method 2: With Simple bracket installation

1. Place the B4850 and brackets as shown in the figure3-5, and insert the B4850 into the brackets. Use 4 screws to fix the module on the front bracket.
   

2. Install another pair of bracket on the first one, fixed by buckles between them.
   

3. Insert the second one B4850 in to the brackets.
   

4. Stack the required number of battery and bracket combinations as described above, and fasten the top and bottom buckles. Shown as Figure3-8.
   

Electrical installation

Statement ： For Australian market, installations should be conducted in accordance with AS/NZS 3000 and AS/NZS 5139”.

Before connecting the power cables, use multimeter to measure cable continuity, short circuit, confirm positive and negative, and accurately mark the cable labels.
Measuring methods：

• Power cable check: select the buzzer mode of multimeter and detect the both ends of the same color cable. If the buzzer calls, it means the cable is in good condition.
• Short circuit judgment: choose multimeter resistor file, probe the same end of positive and negative pole, if the resistor shows infinity, means that the cable is available.
• After visual testing of power line is connection, the positive and negative poles of the battery shall be connected respectively to the positive and negative poles of the opposite terminal.

It is better to add a circuit breaker between the inverter and the battery system. The selection of the circuit breaker requires:

Note: For installation in Australia, an overcurrent protection and isolation device is required between the inverter and battery system

The circuit breaker is installed between the battery module and the inverter, as shown in Figure3-9:

Note:

1. After the whole system connection, set the master DIP mode according to the inverter
   model firstly, then start the battery.

2. The BAT-INV comms cable is from inverter comm port to master CAN IN port, BAT-BAT cable is from master CAN OUT to slave1 CAN IN,slave1 CAN OUT to slave2 CAN IN…

3. Each pair of power cable, it’s limited continuous current is 120A,so if the inverter Max.work current more than 120A,please add power cable according to the proportion.
   Note: For more information of matching inverter brands, please subject to the latest document

   .

Battery parameter settings on the inverter

Max Charging(Bulk) Voltage: 53.5V
Absorption Voltage: 53V
Float Voltage: 52.5V
Shut Down(cut off) Voltage: 47V
Shut Down(cut off) SOC: 20%
Restart Voltage: 49V
Max Charge Current: 25Abattery QTY
Max Discharge Current: 25Abattery QTY
Capacity：1*B4850=50Ah
Batteries and inverters must be installed in accordance with the compatibility listed in the “Dyness Compatible List.xls”;

Register on the website after installation
After the battery system installation is completed and the running is normal, you need to log in to the DYNESS official website to register the product installation and use information to make the product warranty effective.
Please follow the instructions on the website to register.
http://www.dyness-tech.com.cn Service Sign Up

Use, maintenance and troubleshooting

Battery system usage and operation instructions

1. After completing the electrical installation, follow these steps to start the battery system.
2. Refer to the description of the DIP switch of 2.3.1 to prepare the battery module before starting up. First turn on the breaker between inverter and battery before pressing the ON/OFF button of battery system, then press the ON/OFF button to the ON position, next press and hold the SW button for 3 seconds, the battery module will be starting up.
3. After the indicator self-test, the RUN indicator will light and the SOC indicator will be on (100% SOC status in the Figure 4-1).
   
   Note: If you need to shut down the system, firstly switch off the DC breaker between the battery with the inverter, then press SW for 3s and switch the power button to “OFF”.

Caution:

1. After pressing the power button, if the battery status indicator on the front panel continues to be red, please refer to the “4.2 Alarm description and processing “. If the failure cannot be eliminated, please contact the dealer timely.
2. Use a voltmeter to measure whether the voltage of the circuit breaker battery access terminal is higher than 42V, and check whether the voltage polarity is consistent with the inverter input polarity. If the circuit breaker battery input terminal has a voltage output and is greater than 42V, then the battery begin to work normally.
3. After confirming that the battery output voltage and polarity are correct, turn on the inverter, close the circuit breaker.
4. Check if the indicator of the inverter and battery connection (communication indicator and battery access status indicator) is normal. If it is normal, successfully complete the connection between the battery and the inverter. If the indicator light is abnormal, please refer to the inverter manual for the cause or contact the dealer.

Table 4-1 Battery& Inverter power matching table

EPS(backup port)

AC Output power

| AC Output Power| Min. parallel number| System Energy (kWh)| Type| System Energy (kWh)
≤1.2kW| 1| 2.4| Powerbox F-2.5| 2.4
≤2.4 kW| 2| 4.8| Powerbox F-5.0| 4.8
≤3.6 kW| 3| 7.2| Powerbox F-7.5| 7.2
≤4.8 kW| 4| 9.6| Powerbox F-10.0| 9.6
≤6.0 kW| 5| 12.0| 2 Powerbox F-7.5| 14.4
≤7.2 kW| 6| 14.4| 2 Powerbox F-7.5| 14.4
≤8.4 kW| 7| 16.8| 2 Powerbox F-10.0| 19.2
≤9.6 kW| 8| 19.2| 2 Powerbox F-10.0| 19.2
≤14.4 kW| 12| 28.8| 3 * Powerbox F-10.0| 28.8
Equipment Use| Charging| a)       The battery’s long-term continuous charging current should be ≤0.5C

b)       If the battery capacity is empty, please charge it within 18 hours after the battery is empty.

---|---|---
Discharging| c)       The long-term continuous discharge current of the battery should be ≤0.5C

d)       The recommend maximum depth of discharge (DOD)of Battery PACK is no more than 80%.

Alarm description and processing

When protection mode is activated or system failure occurred, the alarm signal will be given through the working status indicator on the front panel of the B4850. The network management can query the specific alarm categories.

If the fault such as single cell overvoltage, charging over-current, under- voltage protection, high-temp protection and other abnormalities which affects the output, please deal with it according to Table 4-2.
Table 4-2 Main alarm and Protection

Buzzer start

| Stop charging and find out the cause of the trouble
High temp| RED| Stop charging
Discharge state| Over-current| RED

Buzzer start

| Stop discharging and find out the cause of the trouble
High temp| RED| Stop discharging and find out the cause of the trouble
Total voltage under voltage| RED

Buzzer start

| Start charging
Cell voltage under voltage| RED

Buzzer start

| Start charging

Analysis and treatment of common faults
Analysis and treatment of common faults in the Table 4-3:
Table 4-3 Analysis and treatment of common faults

Battery gets into over-discharged protection

| Read the battery information on the monitor.
3| The DC power supply time is too short| Battery capacity become smaller| Storage battery replacement

or add more modules

4| The battery can’t be fully charged to 100%| Charging voltage is too low| Adjust charging voltage at 53.5V or 54V

5

| The power cable sparks once power on and ALM light RED| Power connection short-circuit| Turn off the battery, check the cause of the short circuit
6| Communication fault| The DIP setting of the master is wrong/ the battery type of the inverter is wrong/ Communication cable used incorrectly/ communication cable is incorrectly connected at the battery comm port or the inverter comm port/

The battery firmware version is not support the inverter

| Check these possible cause one by one

If you need any technical help or have any question, please contact the seller in time.

Customer Service

DAQIN NEW ENERGY TECH (TAIZHOU) Co.,LTD
Address: Building 13, Jiangyan Industrial Park,
Sanshui Street, Jiangyan District, Taizhou City,
Jiangsu Province,225500
Email: sales@dyness-tech.com
Website: www.dyness-tech.com.cn

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