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Sofar 255KTL-HV User Manual

Solar grid-tied inverter
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User manual
Solar Grid-tied Inverter
Product Model: SOFAR 255KTL-HV
S h e n z h e n S O FA R S O L A R C o . , L t d .

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Summary of Contents for Sofar 255KTL-HV

  • Page 1 User manual Solar Grid-tied Inverter Product Model: SOFAR 255KTL-HV S h e n z h e n S O FA R S O L A R C o . , L t d .

  • Page 2: Table Of Contents

    SOFAR 250/255KTL-HV User Manual Contents Preface................................II 1. Basic Safety Information........................- 1 - 1.1. Requirement for Installation and Maintenance ............- 1 - 1.2. Symbols and signs....................- 4 - 2. Product Characteristics ......................... - 6 - 2.1. Intended Use ......................- 6 - 2.2.

  • Page 3: Preface

    SOFAR 250/255KTL-HV User Manual Preface Notice The products, services or features you purchased shall be subject to the company's commercial contracts and terms. All or part of the products and services described in this document may not within the scope of your purchase. Unless additional terms and conditions in your contract, the company does not make any statement or guarantee on the contents of this document.
  • Page 4 SOFAR 250/255KTL-HV User Manual Outline  This manual is an integral part of SOFAR 250/255KTL-HV. It describes the assembly, installation, commissioning ,maintenance and failure of the product. Please read it carefully before operating. Scope of Validity  This manual contains important instructions for:...

  • Page 5: Basic Safety Information

    This section gives an explanation of all the symbols shown on the inverter and on the type label. 1.1. Requirement for Installation and Maintenance Installation of SOFAR 250/255KTL-HV on-grid inverter must conform with laws, regulations, codes and standards applicable in the jurisdiction. Before installing and adjusting the produce, please read all of instructions,...
  • Page 6 Label and Symbols SOFAR 250/255KTL-HV has type label attach the side of product which contact important information and technical data, the type label must permanent attached to the product.
  • Page 7 SOFAR 250/255KTL-HV User Manual proper package. Transportation company should responsible for any damage during transport period. If you find any packing problems that may cause the damage of inverter or any visible damage, please notice the responsible transportation company immediately.

  • Page 8: Symbols And Signs

    SOFAR 250/255KTL-HV User Manual Inverter should not work again until removing all faults. If any repair work is required, please contact local authorized service centre. Should not open the inverter cover without authorized permit, Attention SOFARSOALR does not take any responsibility for that.
  • Page 9 SOFAR 250/255KTL-HV User Manual Signs on the Product and on the Type Label SOFAR 250/255KTL-HV has some safety symbols on the inverter. Please read and fully understand the content of the symbols before installation. Symbols Name Explanation After disconnect with the DC side, there...

  • Page 10: Product Characteristics

    Efficiency Curves Introduce the efficiency curves of the product. 2.1. Intended Use SOFAR 250/255KTL-HV is a transformerless on grid PV inverter, that converters the direct current of the PV array to the grid-compliant, three-phase current and feeds into the utility grid.
  • Page 11 SOFAR 250/255KTL-HV User Manual Product Dimensions The choice of optional parts of inverter should be made by a qualified technician who knows the installation conditions clearly. Dimensions Description SOFAR 250/255KTL-HV  L×W×H=1100.5*713.5*368mm Figure 2-2 Product front view and left view dimensions - 7 - Copyright ©...

  • Page 12: Function Description

    SOFAR 250/255KTL-HV User Manual Figure 2-3 Product back view and bracket dimensions Labels on the equipment  Note: label must NOT be hidden with objects and extraneous parts (rags, boxes, equipment, etc.,); they must be cleaned regularly and kept visible at all times.

  • Page 13: Electrical Block Diagram

    USB interface for uploading the firmware, remotely uploading is available. 2.3. Electrical block diagram SOFAR 250/255KTL-HV has 16-24 DC input strings. 8-12 MPPT trackers that converters the direct current of PV array to grid-compliant, three phase current and feeds in into the utility grid. Both DC and AC side has Surge Protection Device (SPD).
  • Page 14 SOFAR 250/255KTL-HV User Manual - 10 - Copyright © Shenzhen SOFARSOLAR Co., Ltd...
  • Page 15 SOFAR 250/255KTL-HV User Manual Schematic diaram - 11 - Copyright © Shenzhen SOFARSOLAR Co., Ltd...

  • Page 16: Efficiency And Derating Curve

    SOFAR 250/255KTL-HV User Manual 2.4. Efficiency and derating curve - 12 - Copyright © Shenzhen SOFARSOLAR Co., Ltd...

  • Page 17: Inverter Storage

    SOFAR 250/255KTL-HV User Manual 3.Inverter Storage If inverter is not installing immediately, storage condition need meet below requirements: Place inverter into the original package and leave desiccant inside, sealed  tight with taps. Keep the storage temperature around -40℃ ～ 70℃, Relative humidity 0 ～...

  • Page 18: Installation

    SOFAR 250/255KTL-HV User Manual 4.Installation Outlines of this Chapter This topic describes how to install this product, please read carefully before install. Do NOT install the product on flammable material. Do NOT store this product in potentially explosive atmospheres. Dangers The enclosure and heat sink will get hot during operation, please do not mount the product at a easy to reach location.
  • Page 19 SOFAR 250/255KTL-HV User Manual parts were included in the packing, please contact your distributor immediately if anything missing or damage. Table 4-1Components and mechanical parts that inside the package Pictures Description Quantity 1 pcs SOFAR 250/255KTL-HV 1 pcs Rear Panel...

  • Page 20: Tools

    SOFAR 250/255KTL-HV User Manual 4 pcs Auxiliary Handle 2 pcs M6*30 Hexagon screws 1 pcs Manual Warranty Card 1 pcs 1 pcs Outgoing inspection report 1 pcs Quality Certificate 1 pcs COM 16pin connector M4X14 Cross round head triple set screw（Only for DC 1 pcs switch lock）...
  • Page 21 SOFAR 250/255KTL-HV User Manual Hammer Drill Recommend Used to drill holes on the wall drill @ 10mm Use to tighten and loosen screws when installing AC Screwdriver power cable Use to remove AC connectors from the product Removal Tool Remove PV Connector...

  • Page 22: Determining The Installation Position

    SOFAR 250/255KTL-HV User Manual Use to crimp cable on grid Crimping Tool side, load side extensive cable Check grounding cable, PV Multimeter positive and negative pole Marker Mark signs Measuring Measure distance Tape Ensure the rear panel is Level properly installed...
  • Page 23 SOFAR 250/255KTL-HV User Manual Figure 4-1 Installation Position Selection Figure 4-2 Clearance for single inverter - 19 - Copyright © Shenzhen SOFARSOLAR Co., Ltd...
  • Page 24 SOFAR 250/255KTL-HV User Manual Note: Other requirement for install position: Install position should obstruct the  disconnect of power. Place inverter in an appropriate  bearing capacity objects. Location should be avoid touch by  children. - 20 - Copyright © Shenzhen SOFARSOLAR Co., Ltd...

  • Page 25: Moving Of Inverter

    SOFAR 250/255KTL-HV User Manual Figure 4-3 Clearance for multiple inverters 4.5. Moving of inverter 4.5.1 Manual handling Unload the inverter from package, horizontally move to the install position. When open the package, at least two operator insert the hands into the slots on both side of the inverter and hold the handles.
  • Page 26 SOFAR 250/255KTL-HV User Manual Keep the balance when lift the inverter. Required at least two operators for lifting or use forklift. Inverter is heavy, dropped while being transported may cause injuries. Do not put the inverter with wiring terminals contacting the floor because the power ports and signal ports are not designed to support the weight of the inverter.

  • Page 27: Installation

    SOFAR 250/255KTL-HV User Manual ground by using lifting equipment, check the tightening device of the hoisting ring and rope. After confirming that the binding connection is secure, lift the inverter to the destination. Keep balance when lifting the inverter, avoid to crash on wall or other objective.
  • Page 28 SOFAR 250/255KTL-HV User Manual Step 2: Insert the expansion bolt vertically into the hole. Figure 4-9 Screws into the holes Step 3: Align the rear panel with the hole positions, fix the rear panels on the wall by tightening the expansion bolt with the nuts.
  • Page 29 SOFAR 250/255KTL-HV User Manual Figure 4-11 Fix inverter 4.6.2 Bracket Installation： Step 1: Use wall mount bracket, ensure the pole position are in same level by using level rule and take a mark with maker. Figure 4-12 Ensure hole position Step 2: Drilling hole by using Hammer Drill, recommend to do a stain proofing.
  • Page 30 SOFAR 250/255KTL-HV User Manual Figure 4-13 Drilling holes Step 3: Use M10 screw and M10 flat washer to secure the wall bracket（Note： M10*50 screw and M10 flat washer need self-preparation）. Figure 4-14 Fix wall bracket Step 4: Lift the inverter and hang it on the wall bracket,and fixing both side of inverter with M6 screw（repeat 4.6.1step 4）.
  • Page 31 SOFAR 250/255KTL-HV User Manual Note: If height between ground and bracket is less than 1.3m, use auxiliary handle for installation. Otherwise, use lifting equipment. Figure 4-15 Installation position of auxiliary handle - 27 - Copyright © Shenzhen SOFARSOLAR Co., Ltd...

  • Page 32: Electrical Connection

    SOFAR 250/255KTL-HV User Manual 5.Electrical Connection Outlines of this Chapter This section introduces the electrical connection for the product. Please read the information carefully, it may helpful to understand the grounding wiring, DC input connection, AC output connection and communication connection.

  • Page 33: Terminal Connector

    SOFAR 250/255KTL-HV User Manual 5.7 Safety check Before operate inverter, check the PV array, inverter DC side safety connection and AC side safety connection. 5.1. Electrical Connection Figure 5-1 Flowchart for connecting cables to the inverter 5.2. Terminal Connector Connector description as below:...

  • Page 34: Grounding Connection (Pe)

    5.3. Grounding Connection (PE) Connect the inverter to the grounding electrode usingground cable SOFAR 250/255KTL-HV is a transformerless inverter which requires the positive pole and negative pole of the PV array are NOT grounded. Otherwise, it will cause inverter failure. In the PV system,...

  • Page 35: Connect Grid Side Of Inverter(Ac-Output)

    SOFAR 250/255KTL-HV User Manual OTM6, Cable: ≥6mm Figure 5-3 Grounding connection instruction（2） Note 1: L3 is the length between the insulation layer of the ground cable and crimped part. L4 is the distance between the crimped part and core wires protruding from the crimped part.

  • Page 36: Wiring Terminal And Precautions

    SOFAR 250/255KTL-HV User Manual when inverter detected leakage current excess 300mA, it will cut off with utility grid for protection. For external Residual Current Device (RCD), the rated residual current shall be 300mA or higher. Precondition： Inverter AC side should connect a three phase circuit current to ensure inverter can be cut off with utility grid for abnormal condition.
  • Page 37 SOFAR 250/255KTL-HV User Manual company for help. Inverter can only connect to grid after get the permission from local grid  company. Should not connect any loads between inverter and AC circuit breaker.  OT/DT Requirement.  When use copper core cable, please use copper terminal connector.
  • Page 38 SOFAR 250/255KTL-HV User Manual Figure 5-7 AC Terminal size 5.4.4 Wring Procedure The section will use a five core wire as a sample, four core wire has same connection process. Table 5-1 Recommend AC cable size Name Type Area(mm²) Recommended：Outdoor Copper Wire: 95~185;...
  • Page 39 SOFAR 250/255KTL-HV User Manual Step 5: Crimp the terminal. Step 5: Depending on the grid configuration, connect L1, L2, L3 and N to the terminals according to the label and tighten the screw on the terminal using a screwdriver. - 35 -...

  • Page 40: Connect Pv Side Of Inverter（Dc-Input

    SOFAR 250/255KTL-HV User Manual Note： Phase lines use M12 terminal connector, PE line use M8 terminal connector.  5.5. Connect PV side of inverter（DC-Input） Note： Connecting PV strings into inverter must following the below procedure.  Otherwise, any faulty cause by inappropriate operation will be including in the warranty case.
  • Page 41 SOFAR 250/255KTL-HV User Manual Please use the connectors in the accessories bag. The damage cause by  incorrect is not including in the warranty. Table 5-2 Recommend DC cable size Copper cable cross section area（mm ） Cable OD(mm) Range Recommend 4.0~6.0...
  • Page 42 SOFAR 250/255KTL-HV User Manual Step 4: Measure PV voltage of DC input with multimeter, verify DC input cable polar and connect DC connector with inverter until hearing a slight sound indicated connection succeed. Figure 5-9 DC cable connection Note ： Please use multimeter to make sure the PV array positive pole and negative pole! Dealing ：...

  • Page 43: Communication Connection

    SOFAR 250/255KTL-HV User Manual Figure 5-10 Removal DC connector 5.6. Communication Connection Note：When layout the wiring diagram, please separate the communication wiring and power wiring in case the signal be affected. 5.6.1 USB/WIFI Port Port Description： USB：USB Port Use for updating the software...
  • Page 44 SOFAR 250/255KTL-HV User Manual RS485A RS485 signal+ monitoring or multiple inverter RS485B RS485 signal- monitoring RS485B RS485 signal- Electric meter Electric meter RS485 signal+ RS485A Wire connection Electric meter Electric meter Electric meter RS485 signal- RS485B GND.S RS485 signal ground...

  • Page 45: Commissioning Of Inverter

    6.2. Start Inverter Step 1: Turn ON the DC switch. Step 2: Turn ON the AC circuit breaker. When the DC power generated by the solar array is enough, the SOFAR 250/255KTL-HV inverter will start automatically. Screen showing “normal” indicates correct operation.

  • Page 46: Operation Interface

    SOFAR 250/255KTL-HV User Manual 7.Operation interface Outlines of this chapter This section introduces the display, operation, buttons and LED indicator lights of SOFAR 250/255KTL-HV Inverter. 7.1. Operation and Display Panel Buttons and Indicator lights Button: “ ” Short press UP button = go up “...

  • Page 47: Standard Interface

    SOFAR 250/255KTL-HV User Manual 7.2. Standard Interface LCD interface indicated inverter status, alarm information, communication , grid voltage,current and frequency, connection, PV input current and voltage today ge neration, total generation. Inverter working status, PV 1 -12 PV input voltage and current...
  • Page 48 SOFAR 250/255KTL-HV User Manual Inverter working status, grid voltage and frequency Inverter working status, Wi-Fi/ RS485 status Inverter faulty alarm When power turn 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 49: Main Interface

    SOFAR 250/255KTL-HV User Manual Inverter states includes: wait, check, normal, fault and permanent. Wait:Inverter is waiting to Check State when reconnect the system. In this state, grid voltage value is between the max and min limits and so on; If not, Inverter will go to Fault State or Permanent State.
  • Page 50 SOFAR 250/255KTL-HV User Manual Main interface including below information: Normal ---------Long press DOWN button 1.Enter Setting 2.Event List 3.SystemInfo 4.Display Time 5.Software Update (A)Enter setting Interface as below： 1.Enter Setting --------Long press DOWN button 1.Set time 7.Set Address 2.Clear Energy 8.Set Input mode...
  • Page 51 SOFAR 250/255KTL-HV User Manual 5. On-Off Control Inverter on-off local control. 6. Set Energy Set the total power generation. You can modify the total power generation through this option. 7. Set address Set the address (when you need to monitor multiple inverters simultaneously) ，...

  • Page 52: Updating Inverter Software

    SOFAR 250/255KTL-HV User Manual interface. 2. Event List 1. Current event 2. History event 001 ID04 06150825 (Display the event sequence number, event ID number, Fault information and event occurrence time ) (A) “SystemInfo” Interface as below 3.SystemInfo ------Long press DOWN button 1.Inverter Type...
  • Page 53 SOFAR 250/255KTL-HV User Manual the waterproof nut first and make sure the communication line is no longer the force. Then remove the waterproof cover. U disk Figure 7-1Remove communication broad cover Step 2：Insert USB into computer. Step 3 ： SOFARSOLAR service team will send the software code to user, After user receive the file, please decompressing file and cover the original file in USB flash drive.

  • Page 54: Trouble Shooting And Maintenance

    SOFAR 250/255KTL-HV User Manual 8.Trouble shooting and maintenance 8.1. Troubleshooting This section describes the potential errors for this product. Please read carefully for the following tips when doing the troubleshooting: 1) Check the warning message or faulty codes on the inverter information panel 2) If not any error code display on the panel, please check the following lists: —...
  • Page 55 SOFAR 250/255KTL-HV User Manual of the inverter. If the grid voltage/frequency is within the acceptable range and AC wiring is correct, while the alarm occurs repeatedly, 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.
  • Page 56 SOFAR 250/255KTL-HV User Manual Grid voltage HwADFaultVGrid sampling faulty ID20 (AC) （AC side） Current leakage GFCIDeviceFault( ID21 sampling （DC side） Current leakage GFCIDeviceFault( ID22 sampling （AC side） HwADFaultIdcBr Current Branch ID23 anch sampling faulty DC input current ID24 HwADFaultIdc sampling faulty...
  • Page 57 SOFAR 250/255KTL-HV User Manual ID43 PEConnectFault Ground faulty Input mode ID44 PvConfigError incorrect ID45 CTDisconnect CT error ReversalConnecti Input reverse ID46 connection error ID47 ParallelFault ParallelFault ID48 SNTypeFault Serial number error ID49 Reserved Heat sink1 TempFault_HeatSi ID50 over-temperature protection Heat sink2...
  • Page 58 SOFAR 250/255KTL-HV User Manual protection VbusRmsUnbalan ID65 Unbalanced RMS value of bus voltage Unbalanced VbusInstantUnbal ID66 instantaneous value ance of bus voltage If the configuration of the PV Bus undervoltage array is correct, could be the sun during grid ID67 BusUVP irradiation is too low.
  • Page 59 SOFAR 250/255KTL-HV User Manual PV software ID89 SwPvOCP overcurrent protection Balance electricity ID90 IbalanceOCP passing current protection LLC bus hardware ID97 HwLLCBusOVP overvoltage Inverter bus ID98 HwBusOVP hardware overvoltage HwBuckBoostOC BuckBoosthardwar ID99 e overflows ID100 Reserved ID102 HwPVOCP PV hardware...
  • Page 60 SOFAR 250/255KTL-HV User Manual ID133 Reserved Output transient unrecoverAcOCPI ID134 overcurrent nstant permanent fault Output current unrecoverIacUnba ID135 imbalance lance permanent fault Input mode setting unrecoverPvConfi ID137 error permanent gError failure unrecoverPVOCPI Input overcurrent ID138 nstant permanent fault unrecoverHwPVO Input hardware...
  • Page 61 SOFAR 250/255KTL-HV User Manual SciCommLose(D SCI communication ID153 error (AC) SciCommLose(A SCI communication ID154 error (Fuse) SciCommLose(Fu Inconsistent ID155 software versions ID156 SoftVerError USB fault ID157 ID158 ID161 ForceShutdown ForceShutdown ID162 RemoteShutdown RemoteShutdown ID163 Drms0Shutdown Drms0 shunt down Inverter shows ID83 when remote derating.

  • Page 62: Technical Data

    SOFAR 250/255KTL-HV User Manual ID225- Reserved ID240 8.2. Maintenance Inverters generally do not need any daily or routine maintenance. But ensure heat sink should not be blocked by dust, dirt or any other items.Before the cleaning, make sure that the DC SWITCH is turned OFF and the circuit breaker between inverter and electrical grid is turned OFF.
  • Page 63 SOFAR 250/255KTL-HV User Manual MPPT operating 500V~1500V voltage range Full power MPPT 800V~1300V voltage range Number of MPP trackers Number for DC inputs Max. input current per MPPT Max. input short circuit current per MPPT - 59 - Copyright © Shenzhen SOFARSOLAR Co., Ltd...

  • Page 64: Output Parameter (Ac)

    SOFAR 250/255KTL-HV User Manual 9.2. Output Parameter (AC) Parameter SOFAR 250KTL-HV SOFAR 255KTL-HV Rated output power 250kW 253kW 250kVA@30°C / 255kVA@30°C / Maximum apparent 235kVA@40°C / 235kVA@40°C / power 220kVA@50°C 220kVA@50°C Rated output current 162A 166A Max. Output current 180.5A...

  • Page 65: Performance Parameter

    SOFAR 250/255KTL-HV User Manual 9.3. Performance Parameter Parameter SOFAR 250KTL-HV SOFAR 255KTL-HV Max efficiency 99.01% European Weighted 98.8% efficiency MPPT efficiency >99.9% EN 61000-6-2, EN 61000-6-4 IEC62109-1/2, IEC62116, IEC61727, IEC-61683, Safety standard IEC60068(1,2,14,30) AS/NZS 4777, VDE V 0124-100, V 0126-1-1,...

  • Page 66: General Data

    SOFAR 250/255KTL-HV User Manual 9.4. General Data Parameter SOFAR 250KTL-HV SOFAR 255KTL-HV Topology Transformless Ambient temperature -30℃~+60℃ range Relative humidity 0%～100% DC Switch Cooling Smart forced air cooling Max.altitude 5000m(> 4000m derating) Mounting Wall mount Communication WiFi /GPRS /RS485/PLC/Bluetooth（optional） Display LCD&...

  • Page 67: Quality Assurance

    SOFAR 250/255KTL-HV User Manual 10. Quality Assurance Standard warranty period The standard warranty period of inverter is 60 months (5 years).There are two calculation methods for the warranty period: Purchase invoice provided by the customer: the first flight provides a standard warranty period of 60 months (5 years) from the invoice date;...
  • Page 68 SOFAR 250/255KTL-HV User Manual Invalid warranty clause Equipment failure caused by the following reasons is not covered by the warranty: 1) The "warranty card" has not been sent to the distributor or our company; 2) Without the consent of our company to change equipment or replace parts;...
  • Page 69 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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