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Sofar 3000TLM-G2, User Manual

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SOFAR 3K~6KTLM-G2

User manual

Copyright © Shenzhen SOFARSOLAR Co., Ltd

- 15 -

11

ESD gloves

Operators wear

12

Safety goggles

Operators wear

13

Anti-dust respirator Operators wear

3.4. Determining the Installation Position

Determine an appropriate position for installing the SOFAR 3K~6KTLM-G2

inverter. Comply with the following requirements when determining the installation
position:

Figure3-2 Installation Requirements

Summary of Contents for 3000TLM-G2

Page 1: ...Shenzhen SOFARSOLAR CO Ltd Solar Grid tied Inverter Product Model SOFAR 3K 6KTLM G2 User manual 20200506 ...

Page 2: ...PGND Cables 20 4 3 Connecting DC Input Power Cables 22 4 4 Connecting AC Output Power Cables 24 4 5 RS485 CT Logic interface connection 28 4 6 WiFi GPRS Ethernet module installation procedure 34 4 7 Communication method 34 5 Commissioning of inverter 38 5 1 Safety inspection before commissioning 38 5 2 Start inverter 38 6 Operation interface 39 6 1 Operation and Display Panel 39 6 2 Standard Inter...

Page 3: ...t even when it is transferred to another user or field Copyright Declaration The copyright of this manual belongs to Shenzhen SOFARSOLAR Co Ltd Any corporation or individual should not plagiarize partially copy or fully copy it including software ect and no reproduction or distribution of it in any form or by any means All right reserved SOFARSOLAR reserves the right of final interpretation This m...

Page 4: ...5KTLM G2 SOFAR 6KTLM G2 Keep this manual where it will be accessible at all times Target Group This manual is intended for qualified electrical technical personnel who are responsible for inverter installation and commissioning in the PV power system and PV plant operator Symbols Used This manual is provides safety operation information and uses the symbol in order to ensure personal and property ...

Page 5: ...lt in death or serious injury Warning Caution indicates a hazardous situation which if not avoided could result in minor or moderate injury Caution Attention indicates potential risks which if not avoided may lead to equipment fault or property damage Attention Note provides tips that are valuable for the optimal operation of the product Note ...

Page 6: ...o install and troubleshoot the equipment According to the national and state requirements before connecting to the electrical grid you must get permission from the local electrical grid operation can only be performed by qualified electrical engineer Please contact the nearest authorized service center if any maintenance or repair is needed Contact your distributor for the information of the neare...

Page 7: ... personal injury because of any incorrect use Installation requirements Please install inverter according to the following section Fix the inverter on an appropriate object with enough load bearing capacity such as walls PV racks etc and ensure that inverter is vertical placed Choose a place suitable for installing electrical devices And assure there is enough fire exit space convenient for mainte...

Page 8: ...eer must be trained Completely read the manual operation and understand relevant matter Warning Get permission from the local electrical gird operator complete all electrical connections by professional electrical engineer then connect inverter to electrical grid Attention It s forbidden to remove the tamper evident label or open the inverter Otherwise Sofarsolar will not provide warranty or maint...

Page 9: ...ectromagnetic environment without any trouble or error and impose nonacceptable effect upon the environment Therefore EMC represents the quality characters of an electrical equipment The inherent noise immune character immunity to internal electrical noise External noise immunity immunity to electromagnetic noise of external system Noise emission level influence of electromagnetic emission upon en...

Page 10: ...ltage in the inverter Before opening the equipment operator should wait for five minutes to ensure the capacitor is discharged completely Caution risk of electric shock Caution hot surface CE marking The product complies with the requirements of the applicable EU directives Grounding point Please read this manual before install SOFAR 3K 6KTLM G2 This indicates the degree of protection of the equip...

Page 11: ...ces the efficiency curves of in the inverter 2 1 Product dimensions SOFAR 3K 6KTLM G2 is a dual MPPT grid tied PV inverter which converts the DC power generated by PV arrays into sine wave single phase AC power and feeds it to the public electrical grid AC circuit breaker refer to Section 4 4 and DC switch used as disconnect device and the disconnect device shall be easily accessible Figure2 1 PV ...

Page 12: ...ltaic modules can be connected to the input of the inverter do not connect batteries or other sources of power supply The choice of optional parts of inverter should be made by a qualified technician who knows the installation conditions clearly Overall dimensions L W H 437mm 324mm 130mm Figure 2 2 Front view and left view dimensions Figure 2 3 Back view and Bracket dimensions ...

Page 13: ...t detection DC power is converted to AC power by Power Board AC power is filtered through Output Board then AC power is fed into the grid Output Board also offer functions such as grid voltage output current detection GFCI and output isolation relay Control Board provides the auxiliary power controls the operation state of inverter and shows the operation status by Display Board Display Board disp...

Page 14: ...lled directly by the grid company through a dedicated RS485 serial interface C Limiting the active power fed into the grid The inverter if enabled can limit the amount of active power fed into the grid by the inverter to the desired value Expressed as a percentage D Self power reduction when grid is over frequency When the grid frequency is higher than the limited value inverter will reduce output...

Page 15: ...SOFAR 3K 6KTLM G2 User manual Copyright Shenzhen SOFARSOLAR Co Ltd 10 2 3 Efficiency curve ...

Page 16: ...KTLM G2 in an area used to store Flammable or explosive material Danger The enclosure and heat sink are very hot while the inverter is working therefore do NOT install the SOFAR 3K 6KTLM G2 in places where you might touch them inadvertently Caution Consider the weight of SOFAR 3K 6KTLM G2 when transporting and moving the inverters Choose an appropriate mounting position and surface Assign at least...

Page 17: ...ou are advised to remove the packing materials within 24 hours before installing the SOFAR 3K 6KTLM G2 inverter Checking Deliverables After unpacking the inverter check whether deliverables are intact and complete If any damage is found or any component is missing contact the dealer Table3 1 shows the components and mechanical parts that should be delivered NO Picture Description Quantity 1 3K 6KT...

Page 18: ...6 flat washer 8pcs 10 Self tapping screw 5pcs 11 Manual 1pcs 12 The warranty card 1pcs 13 Registration Form 1pcs 14 AC output terminal 1pcs 15 485 terminal 2pin 1pcs 3 3 Tools Prepare tools required for installation and electrical connections Table 3 2 shows the tools required for installation and electrical connections ...

Page 19: ...Screwdriver wiring 3 Removal tool Remove PV terminal 4 Wire stripper Strip wire 5 4mm Allen Wrench Turn the screw to connect rear panel with inverter 6 Crimping tool Used to crimp power cables 7 Multi meter Used to check grounding 8 Marker Used to mark signs 9 Measuring tape Used to measure distances 10 Level Used to ensure that the rear panel is properly installed ...

Page 20: ...fety goggles Operators wear 13 Anti dust respirator Operators wear 3 4 Determining the Installation Position Determine an appropriate position for installing the SOFAR 3K 6KTLM G2 inverter Comply with the following requirements when determining the installation position Figure3 2 Installation Requirements ...

Page 21: ...tiple SOFAR 3K 6KTLM G2 inverter 3 5 Moving the SOFAR 3K 6KTLM G2 This topic describes how to move the to the installation position Horizontally SOFAR 3K 6KTLM G2 Step 1 Open the packaging insert hands into the slots on both sides of the inverter and hold the handles as shown in Figure 3 3 and Figure 3 4 Figure 3 3 Moving the inverter 1 ...

Page 22: ...er on the floor put foam or paper under the inverter to protect its shell Attention 3 6 Installing SOFAR 3K 6KTLM G2 Step 1 Determine the positions for drilling holes ensure the hole positions are level then mark the hole positions using a marker pen use the hammer drill to drill holes on the wall Keep the hammer drill perpendicular to the wall do not shake when drilling so as not to damage the wa...

Page 23: ...re 3 5 Step 4 Hook the inverter to the rear panel Using an M5 screw to secure the inverter to the rear panel to ensure safety Step 5 You can secure the inverter to the rear panel and protect if from stealing by installing an anti theft lock this action is optional Figure 3 6 ...

Page 24: ...ock hazard Therefore before connecting DC input power cable cover PV modules using opaque clot Danger In Germany the PV array maximum voltage must be 600V max output of single inverter is 4 6KVA and max output of PV system is 13 8KVA SOFAR 3K 6KTLM G2 has 2 MPPT trackers all PV modules connected to the same MPPT should have similar rated electrical characteristics including Isc Voc Im Vm Pm and te...

Page 25: ...o the grounding electrode using protection ground PGND cables for grounding purpose The inverter is transformer less requires the positive pole and negative pole of the PV array are NOT grounded Otherwise it will cause inverter failure In the PV power system all non current carrying metal parts such as PV module frame PV rack combiner box enclosure inverter enclosure should be connected to earth A...

Page 26: ...hown in Figure 4 3 Figure4 3 Preparing a ground cable 2 Note 1 L3 is the length between the insulation layer of the ground cable and the crimped part L4 is the distance between the crimped part and core wires protruding from the crimped part Note 2 The cavity formed after crimping the conductor crimp strip shall wrap the core wires completely The core wires shall contact the terminal closely Step ...

Page 27: ...able specifications Cross Sectional Area mm External Cable Diameter mm Range Recommended Value 4 0 6 0 4 0 4 5 7 8 Step 1 Remove cable glands from the positive and negative connectors Step 2 Remove the insulation layer with an appropriate length from the positive and negative power cables by using a wire stripper as show in Figure 4 5 Figure 4 5 Connecting DC input power cables ...

Page 28: ...nto the positive and negative metal terminals respectively and crimp them using a clamping tool Ensure that the cables are crimped until they cannot be pulled out by force less than 400 N as shown in Figure 4 6 Figure 4 6 Connecting DC input power cables 1 Positive power cable 2 Negative power cable Step 5 Insert crimped power cables into corresponding housings until you hear a click sound The pow...

Page 29: ...es 1 Bayonet Note Insert the stoppers into the unused DC connectors Follow up Procedure To remove the positive and negative connectors from the inverter insert a removal wrench into the bayonet and press the wrench with an appropriate strength as shown in Figure 4 8 Before removing the positive and negative connectors ensure that the DC SWITCH is OFF Caution Figure 4 8 Removing a DC input connecto...

Page 30: ...rcuit breaker Table4 2 Recommended AC output cable specifications Model SOFAR 3000TLM G2 SOFAR 3600TLM G2 SOFAR 4000TLM G2 SOFAR 4600TLM G2 SOFAR 5000TLM G2 SOFAR 6000TLM G2 Cable Copper 4mm2 4mm2 4mm2 6mm2 6mm2 6mm2 Breaker 20A 230V 2 P 0 1A 25A 230V 2 P 0 1A 25A 230V 2 P 0 1A 32A 230V 2 P 0 1A 32A 230V 2 P 0 1A 32A 230V 2 P 0 1A Multi core copper wire AC cable should be correctly sized to ensure...

Page 31: ...ed to make AC output cable connections by himself and the appearance of the AC connector is shown below Figure 4 11 AC output connector AC wire connections procedure Step 1 Select appropriate cables according to Table 4 2 Remove the insulation layer of the AC output cable using a wire stripper according to the figure shown below A 30 50mm B 6 8mm Figure 4 12 ...

Page 32: ... hole labeled PE fasten the wire using an Allen wrench Connect the brown wire to the hole labeled L fasten the wire using an Allen wrench Connect the blue wire to the hole labeled N fasten the wire using an Allen wrench Figure 4 14 L brown N blue PE yellow green Step 4 Secure the locking cable gland clockwise shown as below make sure that all the wires are securely connected Step 5 Connect the AC ...

Page 33: ...Figure 4 17 Table 4 3 Recommended communication cable size are shown below The wiring methods are the same for RS485 and CT this part describes their wiring methods and logic interface wiring method Communication function RS485 CT Cable size 0 5 1 5mm 0 5 1 5mm Outside diameter 2 5 6mm 2 5 6mm Step1 Connect CT and Network cable Connect the orange wire and green wire to the positive pole of CT usin...

Page 34: ...l Step2 Remove the communication waterproof cover using a screwdriver Figure 4 18 Step3 Unlock the waterproof cable gland remove the stopper in the waterproof connector Figure 4 19 A1 Waterproof stopper Step4 Select appropriate cable according Table4 2 remove the insulation layer using a wire stripper the length of the wire core is about 6mm insert the cable through the cable gland and waterproof ...

Page 35: ... shown in the figure below Table 4 4 Function description of the communication terminals Type RS485 CT Logic interface Connector Label TX TX CT CT The following table Function RS485 differential signal RS485 differential signal CT CT Figure 4 20 1 About the use of CT 1 Refer to the figure below and put the CT in the correct position Figure 4 21 ...

Page 36: ...n are defined according to different standard requirements a Logic interface for AS NZS 4777 2 2015 also known as inverter demand response modes DRMs The inverter will detect and initiate a response to all supported demand response commands within 2 s The inverter will continue to respond while the mode remains asserted Table 4 5 Function description of the DRMs terminal Pin NO Color Function 1 Wh...

Page 37: ...tact 1 input K1 Relay 1 output 2 L2 Relay contact 2 input K2 Relay 2 output 3 L3 Relay contact 3 input K3 Relay 3 output 4 L4 Relay contact 4 input K4 Relay 4 output 5 G GND Relays common node 6 NC Not Connected Not Connected 7 NC Not Connected Not Connected 8 NC Not Connected Not Connected Table 4 7 The inverter is preconfigured to the following RRCR power levels Relay status close is 1 open is 0...

Page 38: ...ected Not Connected 5 G GND K1 Relay 1 output 6 NC Not Connected Not Connected 7 NC Not Connected Not Connected 8 NC Not Connected Not Connected Table 4 9 The inverter is preconfigured to the following RRCR power levels Relay status close is 1 open is 0 L1 Active Power Power drop rate Cos φ 1 0 5 seconds 1 0 100 1 Step4 Insert the terminal as per the printed label and then tighten the screws to fi...

Page 39: ...Ethernet waterproof cover using screw driver Step2 Install Wi Fi GPRS Ethernet module Stpe3 Fasten Wi Fi GPRS Ethernet module using screws Figure 4 25 4 7 Communication method SOFAR 3K 6KTLM G2 gird connected inverters offer RS485 standard and Wi Fi communication modes GPRS Ethernet optional A Communication between one inverter and one PC 1 RS485 Refer to the figure shown below connect the TX and ...

Page 40: ...he PC Figure 4 27 The operation information generated energy alert operation status of the inverter can be transferred to PC or uploaded to the server via Wi Fi GPRS Ethernet You can register on the website http www solarmanpv com portal Register Regi_Pub aspx Using the Wi Fi GPRS Ethernet S N number NOTE3 then you can login the website http www solarmanpv com portal LoginPage aspx to remote monit...

Page 41: ...of 31 inverters can be connected in one daisy chain NOTE2 Figure 4 28 2 WI FI GPRS Ethernet Refer to the figure shown below wireless function required for the PC Figure 4 29 The operation information generated energy alert operation status of the inverter can be transferred to PC or uploaded to the server via WIFI GPRS Ethernet You can register on the website http www solarmanpv com portal Registe...

Page 42: ...e should be less than 1000 m Note2 When multiple inverters are connected via RS485 wires set mod bus address to differentiate the inverters Note3 S N number of the Wi Fi GPRS Ethernet module is located on the side Note4 Specific use methods of Wi Fi GPRS Ethernet can refer to the operation manual of Wi Fi GPRS Ethernet ...

Page 43: ... NOTE Choose the correct country code refer to section 6 3 of this manual Notice Different distribution network operators in different countries have different requirements regarding grid connections of PV grid connected inverters Therefore it s very important to make sure that you have selected the correct country code according to requirements of local authority Please consult qualified electric...

Page 44: ... 3K 6KTLM G2 Inverter 6 1 Operation and Display Panel Buttons and Indicator lights Key button Back to return to previous menu or enter into main menu from the standard interface Up to move up or increase value Down to move down or decrease value OK to confirm selection Indicator Lights Inverter States Light GREEN Flashing Wait or Check state ON Normal state OFF Fault or Permanent state Warning Lig...

Page 45: ...rning Light RED ON ID12 GFCI Fault or ID20 GFCI Device Fault OFF GFCI normal 6 2 Standard Interface When power on LCD interface displays INITIALIZING refer below picture when control board successfully connected with communication board the LCD display the current state of the inverter display as shown in the figure below ...

Page 46: ...nsure inverter software and hardware are functional Inverter will go to Fault State or Permanent State if any error or fault occurs Normal Inverter enter to Normal State it is feeding power to the grid inverter will go to Fault State or Permanent state if any error or fault occurs Fault Fault State Inverter has encountered recoverable error It should recover if the errors disappear If Fault State ...

Page 47: ...7 Set Reflux 7 Set Energy 18 MPPT Scan 8 Set Address 19 StartTime 9 Set Input mode 20 Logic interface 10 Set Language 21 Set Power Ratio 11 Set Start Parameter Press Back to Enter the main interface of 1 Enter Setting and press OK to Enter the Setting menu You can select the content you want to set by pressing Up or Down Note1 Some settings need to enter the password the default password is 0001 w...

Page 48: ...1 CEI0 21 Internal 22 Europe General 43 EU EN50549 02 Australia 23 CEI0 21 External 44 South Africa 03 Spain RD1699 24 Cyprus 45 AU WA 04 Tuekey 25 India 46 Dubai DEWG 05 Denmark 26 Philippines 47 Dubai DEWG MV 06 Greece Continent 27 New Zealand 48 Taiwan 07 Netherland 28 Brazil 49 AU VIC 08 Belgium 29 Slovakia VSD 100 AU SA 09 UK G99t 30 Slovakia SSE 101 AU QLD 10 China 31 Slovakia ZSD 102 AU VAR...

Page 49: ...inverters simultaneously Default 01 9 Set Input mode SOFAR 3K 6KTLM G2 has two MPPT channels which can run independently or in parallel Users choose the operation mode of MPPT according to the system design Parallel mode is applicable to the case where two channels are in parallel independent mode is applicable to the case where two channels of MPPT run independently and the default mode is indepe...

Page 50: ...nection for details Enter 1Enter setting OK 1 Set Time 2 Event List 2Clean Energy Up 3 System Info Up 3 Clean Events Down 4 System time Down 5Software Update 17 Set Reflux P OK Input password OK Input 0001 0001 OK Reflux Enable OK KW Input the allowable export power Press Up or Down to change the value of the first digit Press OK to switch to second digit Press Up or Down to change the value of th...

Page 51: ...Press Back and Down to turn the page in standard interface then enter into 2 Event List interface 2 Event List 1 Current event 2 History event Fault information 01 ID04 06150825 Display the event sequence number event ID number and event occurrence time C SystemInfo Interface as below The user enters the main menu by pressing Back turns the page to select menu contents and presses OK to enter 3 Sy...

Page 52: ...ng the communication plug which has been connected Step 2 Insert the SD card into the compute Step 3 SOFAR SOLAR will send the Software code to the user who needs to update After user receive the file please decompressing file and cover the original file in SD card Step 4 Insert the SD card into the SD card interface Step 5 Then turn on DC switch and enter into the online upgrade to the main menu ...

Page 53: ...e to update from step 5 Step 9 After the update is completed turn off the DC breaker wait for the LCD screen extinguish then recover the communication waterproof and then turn on the DC breaker and AC breaker again the inverter will enter the running state User can check the current software version in Systemlnfo 3 SoftVersion ...

Page 54: ... information If there is no fault information shown on the screen check whether the following requirements are met Is the inverter mounted in a clean dry place with good ventilation Is the DC switch turned ON Are the cables adequately sized and short enough Are the input and output connections and wiring in good condition Are the configuration settings correct for the particular installation Are t...

Page 55: ...atedly contact technical support to change the grid over voltage under voltage over frequency under frequency protection points after obtaining approval from the local electrical grid operator ID02 GridUVP The power grid voltage is too low ID03 GridOFP The power grid frequency is too high ID04 GridUFP The power grid frequency is too low ID05 PVUVP The input voltage is too low Check whether too few...

Page 56: ...rrent is too high and has happen hardware protection ID15 ID24 are internal faults of inverter turn OFF the DC switch wait for 5 minutes then turn ON the DC switch Check whether the fault is rectified Ifno please contact technical support ID16 AcRmsOCP The grid current is too high ID17 HwADFaultIGri d The grid current sampling error ID18 HwADFaultDCI The DCI sampling error ID19 HwADFaultVGr id The...

Page 57: ...rid voltage sampling value between the master DSP and slave DSP is not consistent ID49 ID55 are internal faults of inverter turn OFF the DC switch wait for 5 minutes then turn ON the DC switch Check whether the fault is rectified If no please contact technical support ID50 ConsistentFault_ FGrid The grid frequency sampling value between the master DSP and slave DSP is not consistent ID51 Consisten...

Page 58: ...balance The input current is unbalance and has cause unrecoverable fault ID69 UnrecoverVbus Unbalance The bus voltage is unbalance and has cause unrecoverable fault ID70 UnrecoverOCPI nstant The grid current is too high and has cause unrecoverable fault ID71 UnrecoverPvCon figSetWrong Incorrect input mode Check the input mode parallel mode independent mode setting of inverter according to Section ...

Page 59: ...nd the communication board is not consistent Contact technical support to upgrade software ID95 Communicationb oardEEPROMfa ult The communication board EEPROM is fault ID95 ID96 are internal faults of inverter turn OFF the DC switch wait for 5 minutes then turn ON the DC switch Check whether the fault is rectified If no please contact technical support ID96 RTCclockchipan omaly RTC clock chip is f...

Page 60: ...inverters ensure there is enough space around the heat sink for ventilation check the heat sink for blockage dust snow etc and clean them if they exist Please clean the heat sink with an air blower a dry soft cloth or a soft bristle brush Do NOT clean the heat sink with water corrosive chemicals detergent etc ...

Page 61: ...2 SOFAR 6000TLM G2 Recommended Max PV input power 3990Wp 4790Wp 5320Wp 6120Wp 6650Wp 7980Wp Max DC input power 3500W 4000W 4400W 5000W 5500W 6600W Max DC power for single MPPT 2000W 2400W 2600W 3000W 3300W 4000W Max Input voltage 600V Aux Start up voltage 60V Start up input voltage 120V MPPT voltage range 90 580V Rated input voltage 360V Full load DC voltage range 160 520V 180 520V 200 520V 230 52...

Page 62: ... Output power 3000W 3680W 4000W 4600W 5000W 6000W Max Output power 3000VA 3680VA 4000VA 4600VA 5000VA 6000VA Max Output current 13 7A 16 8A 18 2A 21A 22 8A 27 3A Nominal grid voltage L N PE 220Vac 230Vac 240Vac Grid voltage range 180 276Vac According to local grid standard Nominal grid frequency 50Hz 60Hz Grid frequency range 45 55Hz 54 66Hz According to local grid standard THDi 3 Power factor 1de...

Page 63: ...on at night 1W Safety protection Anti islanding RCMU Ground fault monitoring Certification AS NZS 4777 VDE V 0124 100 V 0126 1 1 VDE AR N 4105 CE10 21 EN 50438 EN50549 G83 G59 G98 G99 NB T32004 ABNT NBR 16149 16150 for SOFAR3KTLM G2 SOFAR5KTLM G2 Protective class Class I External environment pollution degree Degree 3 Overvoltage category PV OVC II AC mains OVC III Max inverter Back feed current to...

Page 64: ...5000TLM G2 SOFAR 6000TLM G2 Topology Transformer less Ambient temperature range 25 60 Permissible humidity range 0 100 Noise figure 25dB DC Switch Optional Cooling Natural convection Max Operating altitude 2000m Outline Dimension 405 315 135mm Bracket Wall mounted Weight 11 5kg Display LCD Communication mode RS485 WiFi GPRS Ethernet optional SD card Degree of protection IP65 ...

Page 65: ...chase of the inverter based on the purchase invoice or within 24 months of the production of the inverter SN number of machine based on the first date of arrival Customers can apply to buy extended warranty products from the company s sales team by providing the product serial number Our company may refuse to do not conform to the time limit extended warranty purchase application Customers can buy...

Page 66: ... non company modify or attempt to repair and erase the product serial number or silk screen 5 Incorrect installation debugging and use methods 6 Failure to comply with safety regulations certification standards etc 7 Damage caused by improper storage by dealers or end users 8 Transportation damage including scratches caused by internal packaging during transportation Please claim directly from the...

Page 67: ...emedies held by a consumer at law Our goods come with guarantees that cannot be excluded under the Australian Consumer Law You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a ...

Page 68: ...ADD 401 Building 4 AnTongDa Industrial Park District 68 XingDong Community XinAn Street BaoAn District Shenzhen GuangDong P R China Email service sofarsolar com Tel 0510 6690 2300 Web www sofarsolar com ...

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