REFUSOL 20K-2T Installation And Operating Manual
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REFUSOL 20K-2T Installation And Operating Manual

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REFUSOL 20K-2T
Installation and
operating manual
Version 01 | June 2023
English

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Summary of Contents for REFUSOL 20K-2T

  • Page 1 REFUSOL 20K-2T Installation and operating manual Version 01 | June 2023 English...

  • Page 3: Table Of Contents

    REFUsol 20K-2T (853P020.200) User manual Table of Content Preface ........................III 1. Basic Safety Information ..................- 1 - 1.1. Requirement for Installation and Maintenance ........ - 1 - 1.2. Symbols and signs ................- 4 - 2. Product Characteristics ..................- 7 - 2.1.

  • Page 4: Preface

    REFUsol 20K-2T (853P020.200) 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 5 REFUsol 20K-2T (853P020.200) User manual Outline  This manual is an integral part of REFUSOL 20K-2T (853P020.200). 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 REFUSOL 20K-2T (853P020.200).

  • Page 6: Basic Safety Information

    1.1. Requirement for Installation and Maintenance Installation of REFUSOL 20K-2T (853P020.200) 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, cautions and warnings in this manual.
  • Page 7 Label and Symbols REFUSOL 20K-2T (853P020.200) 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 8 REFUsol 20K-2T (853P020.200) User manual Transportation Requirement Inverter is in the good electrical and physical condition when it ship out from factory. During transport, inverter must be placed in its original package or other proper package. Transportation company should be responsible for any damage during transport period.

  • Page 9: Symbols And Signs

    REFUsol 20K-2T (853P020.200) User manual Maintenance and repair Before any repair work, turn OFF the AC circuit breaker between the inverter and electrical grid first, then turn OFF the DC switch. After turning OFF the AC circuit breaker and DC switch wait for at least 5 minutes before carrying any maintenance or repair work.
  • Page 10 Any damage cause by overvoltage, REFU ELEKTRONIK will not take the responsibility including warranty Warning Signs on the Product and on the Type Label REFUSOL 20K-2T (853P020.200) has some safety symbols on the inverter. Please read and fully understand the content of the symbols before installation. Symbols Name...
  • Page 11 REFUsol 20K-2T (853P020.200) User manual Observe Read all documentation supplied documentation with the product before install Positive pole and negative Positive pole and negative pole of pole the input voltage (DC) Indicated temperature Temperature allowance range RCM (Regulatory Compliance Mark)

  • Page 12: Product Characteristics

    Introduce the efficiency curves of the product. 2.1. Intended Use Field of use REFUSOL 20K-2T (853P020.200) is a transformer-less on grid PV inverter, that converters the direct current of the PV panels to the grid-compliant, three-phase current and feeds into the utility grid.
  • Page 13 ELEKTRONIK will not take the responsibility. Intended grid types. REFUSOL 20K-2T (853P020.200) configurations. For the TT type of electricity grid，the voltage between neutral and earth should be less than 30V. inverters are compatible with TN-S, TN-C, TN-C-S, TT, IT grid.
  • Page 14 The choice of optional parts of inverter should be made by a qualified technician who knows the installation conditions clearly. Dimensions Description L×W×H=520*430*189mm Figure 2-3 Front, side and back of the inverter Figure 2-4a Bottom view Note: REFUsol 20K-2T supports 4-channel PV string input. Figure 2-5 bracket dimensions - 9 -...
  • Page 15 7. AC output 4. USB Port (for WIFI or Ethernet communication) 8. Fans Figure 2-6 Bottom view of the REFUSOL 20K-2T (853P020.200) Labels on the equipment Note: label must NOT be hidden with objects and extraneous parts (rags, boxes, equipment, etc.,);...

  • Page 16: Function Description

    REFUsol 20K-2T (853P020.200) User manual 2.2. Function Description DC power generated by PV arrays is filtered through Input Board then enter Power Board. Input Board also offer functions such as insulation impedance detection and input DC voltage/ current detection. DC power is converted to AC power by Power Board.

  • Page 17: Electrical Block Diagram

    REFUsol 20K-2T (853P020.200) User manual 2.3. Electrical block diagram Figure 2-8 Schematic diagram 2.4. Efficiency and derating curve Figure 2-9 Power efficiency curve - 12 -...
  • Page 18 REFUsol 20K-2T (853P020.200) User manual Figure 2-10 Rated Power ratio vs Grid Voltage - 13 -...

  • Page 19: Inverter Storage

    REFUsol 20K-2T (853P020.200) User manual 3.Inverter Storage If inverter is not installed immediately, storage condition need to 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 20: Installation

    REFUsol 20K-2T (853P020.200) 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...
  • Page 21 REFUsol 20K-2T (853P020.200) User manual Checking Deliverable After unpacking, please check according to following table, to see whether all the parts were included in the packing, please contact your distributor immediately if anything missing or damage. Figure 4-1: Components and mechanical parts that are inside the package...
  • Page 22 REFUsol 20K-2T (853P020.200) User manual PV- metal pin 4PCS M6*12 Hexagon screws 1 PCS Manual 1PCS Warranty Card 1PCS Quality Certificate 1PCS R-type terminal 5PCS Communication 1PCS Terminal Note ： The first communication terminal is used as a default example in the description of the machine appearance in the manual.

  • Page 23: Tools

    REFUsol 20K-2T (853P020.200) User manual 4.3. Tools Prepare tools required for installation and electrical connection as following table: Figure 4-2: Installation tools Tool Description Function Hammer Drill Recommend Used to drill holes on the wall drill @ 60mm Use to tighten and loosen...

  • Page 24: Determining The Installation Position

    REFUsol 20K-2T (853P020.200) User manual Check grounding cable, PV Multimeter positive and negative pole Marker Mark signs Measuring Measure distance Tape Ensure the rear panel is Level properly installed Installer wear when installing ESD gloves product Installer wear when installing...
  • Page 25 REFUsol 20K-2T (853P020.200) User manual Figure 4-1 Installation Position Selection Figure 4-2 Clearance for single inverter - 20 -...

  • Page 26: Moving Of Inverter

    REFUsol 20K-2T (853P020.200) User manual Figure 4-3 Clearance for multiple inverters 4.5. Moving of inverter Unload the inverter from package, horizontally move to the install position. When open the package, at least two operators insert the hands to the back of heat sink part.

  • Page 27: Installation

    REFUsol 20K-2T (853P020.200) User manual Inverter is heavy, attention to keep the balance when lift the inverter. 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 28 REFUsol 20K-2T (853P020.200) User manual Figure 4-7 Installation instruction (2) Step 5：User can use a lock to block the inverter in case of stealing (Optional) - 23 -...

  • Page 29: Electrical Connection

    REFUsol 20K-2T (853P020.200) 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 be helpful to understand the grounding wiring, DC input connection, AC output connection and communication connection.

  • Page 30: Grounding Connection (Pe)

    5.2. Grounding Connection (PE) Connect the inverter to the grounding electrode using ground cable. REFUSOL 20K-2T (853P020.200) is a transformer less 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, all non-current-carrying metal parts (such as mounting frame, combiner box enclosure, etc.) should be connected to...

  • Page 31: Connect Grid Side Of Inverter (Ac-Output)

    Figure 5-4 Inverter external grounding instruction diagram 5.3. Connect grid side of inverter (AC-Output) REFUSOL 20K-2T (853P020.200) connect to utility grid by using AC power cable. The AC connection must meet the requirement of local grid operator. - 26 -...
  • Page 32 REFUsol 20K-2T (853P020.200) User manual Ban multiple Inverters use one circuit breaker. Ban connect loads between inverter and circuit breaker Caution Must use five core outdoor cable, the recommend AC cable and Residual current breaker (RCB) as below table 5-1:...
  • Page 33 IP65 level requirements after installation. AC cable need customer self connect, the out looking is as below figure 5-7: Multi-core cable Figure 5-7 REFUSOL 20K-2T (853P020.200) AC terminal connector picture Wiring Procedure as following: Step 1: Remove the AC waterproof cover screw with a screwdriver and take out the stopper in the PG waterproof joint.
  • Page 34 REFUsol 20K-2T (853P020.200) User manual Figure 5-8: Removing AC waterproof cover diagram. Step 2: Select the appropriate cable diameter according to table 5-1, process the cable according to the following picture size requirements, and then pass through PG waterproof joint.

  • Page 35: Connect Pv Side Of Inverter (Dc-Input)

    REFUsol 20K-2T (853P020.200) User manual Figure 5-10 AC cable connection instruction diagram (2) 5.4. Connect PV side of inverter (DC-Input) Table 5-2 recommend DC input cable size (maximum tolerance voltage >= 1100V PV cable) Copper cable cross section area（mm Cable OD (mm) ）...
  • Page 36 REFUsol 20K-2T (853P020.200) User manual Figure 5-11: DC cable connection（1） Step 2: Crimp the PV metal contact pin to the striped cable using a proper crimping pliers. Figure 5-12: DC cable connection (2) Step 3: Insert wire into the connector cap nut and assemble into the back of male or female plug, when you heard a “click”, the pin tact assembly is seated correctly.

  • Page 37: Communication Connection

    Note REFUSOL 20K-2T (853P020.200) inverter has one USB Port and one COM Port, as shown in the following figure. Zoom in - 32 -...
  • Page 38 REFUsol 20K-2T (853P020.200) User manual 1.USB Port 2.COM Port Figure 5-17: Communication connection Port 5.5.1. USB Port Port Description： USB flash disk access Use for updating the software USB port acquisition stick Use for remote data acquisition and (WIFI or Ethernet) access upgrading of inverter Procedure：...
  • Page 39 REFUsol 20K-2T (853P020.200) User manual Communication pair meets local standards Wire Port Description： Define Function Note RS485A RS485 signal+ Wire connection RS485A RS485 signal+ monitoring or multiple RS485B RS485 signal- inverter monitoring RS485B RS485 signal- Electric meter Electric meter RS485...
  • Page 40 REFUsol 20K-2T (853P020.200) User manual ① ② ③ ④ ⑤ 5.5.3. Communications Port Description This topic describes the functions of the RS485 and WIFI. RS485 By RS485 interface, transfer the inverter power output information, alarm information, operation state to the PC terminal or local data acquisition device, then uploaded to the server.
  • Page 41 REFUsol 20K-2T (853P020.200) User manual If only one REFUSOL 20K-2T (853P020.200) is used, use a communication cable, refer to section 5.5.2 for COM pin definition, and choose either of the two RS485 ports. Figure 5-19: A single REFUSOL 20K-2T (853P020.200) connecting communications.
  • Page 42 REFUsol 20K-2T (853P020.200) User manual REFUSOL 20K-2T (853P020.200) at its relevant website or APP according to monitoring device SN. Figure 5-21: Connect one USB acquisition stick (WIFI version) to wireless router Figure 5-22: Connect multiple USB acquisition stick (WIFI version) to wireless router The length of the RS485 communication cable should be ...

  • Page 43: Commissioning Of 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 REFUSOL 20K-2T (853P020.200) inverter will start automatically. Screen showing “normal” indicates correct operation.
  • Page 44 REFUsol 20K-2T (853P020.200) User manual electrical engineer or personnel from electrical safety authorities about this. REFU Elektronik GmbH is not responsible for any consequences arising out of incorrect country code selection. If the inverter indicates any fault, please refer to Section 8.1 of this manual —...

  • Page 45: Operation Interface

    REFUsol 20K-2T (853P020.200) User manual 7.Operation interface Outlines of this chapter This section introduces the display, operation, buttons, and LED indicator lights of REFUSOL 20K-2T (853P020.200) Inverter. 7.1. Operation and Display Panel Buttons and Indicator lights GFCI lamp Up button...

  • Page 46: Standard Interface

    REFUsol 20K-2T (853P020.200) User manual 7.2. Standard Interface LCD interface indicated inverter status, alarm information, communication connection, PV input current and voltage, grid voltage, current and frequency, today generation, total generation. Inverter working status, PV 1 input voltage and current.
  • Page 47 REFUsol 20K-2T (853P020.200) User manual Inverter working status, grid voltage and frequency Inverter working status, USB status Inverter faulty alarm 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 48: Main Interface

    REFUsol 20K-2T (853P020.200) User manual Inverter states includes wait, check, normal and fault 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 49 REFUsol 20K-2T (853P020.200) User manual (A)Enter setting Interface as below： 1.Enter Setting --------Long press DOWN button 1.Set Time 13.PCC Select 2.Clear Energy 14.Reflux Mode 3.Clear Events 15.OVP 4.Set SaftCode 16.Power Limit 5.On-Off Control 17.ReactivePara 6.Set Energy 18.Hard Reflux 7.Set ComProtocol 19.Set Insulation...
  • Page 50 REFUsol 20K-2T (853P020.200) User manual into inverter communication port. Table 7-1 Country code setting code country code country code country Germany Korea Thailand PEA AR-N4105 CEIO-21 Internal Sweden Thailand MEA Australia Europe General LV-Range-50HZ Spain RD 1699 CEIO-21 External EU EN50549...
  • Page 51 13. PCC Select The function is divided into two options: PCC Meter and PCC ARPC, the first one is the default usage for REFUsol 20K-2T. Refer to <7.5 Smart meter instruction in this manual for specific operation methods. 14. Reflux Mode...
  • Page 52 User manual The function is divided into three options: CTR Totalpower, CTR Phasepower and CTR SellingPower, the first one is the default usage for REFUsol 20K-2T. Refer to <7.5 Smart meter usage in this manual for specific operation methods. 15. OVP Set the over voltage protection value.
  • Page 53 REFUsol 20K-2T (853P020.200) User manual Test 59.S1 OK! ↓ Wait Testing 59.S2... ↓ Wait Test 59.S2 OK! ↓ Wait Testing 27.S1... ↓ Wait Test 27.S1 OK! ↓ Wait Testing 27.S2... ↓ Wait Test 27.S2 OK! ↓ Wait Testing 81>S1... ↓...
  • Page 54 REFUsol 20K-2T (853P020.200) User manual ↓ Short press the“∨” 27.S1 threshold 195.5V 1500ms ↓ Short press the“∨” 27.S1: 228V 1508ms ↓ Short press the“∨” 27.S2 threshold 34.5V 200ms ↓ Short press the“∨” 27.S2: 227V 205ms ↓ Short press the“∨” 81>.S1 threshold 50.5Hz 100ms ↓...
  • Page 55 REFUsol 20K-2T (853P020.200) User manual interface through main interface to check details of real-time event records, Event will be listed by the happening time, and recent events will be listed in the front. Please refer to below picture. Long press the button and short press the button to turn the page in standard interface, then enter into “2.

  • Page 56: Updating Inverter Software

    USB flash disk. 7.4. Updating Inverter Software REFUSOL 20K-2T (853P020.200) inverter offer software upgrade via USB flash drive to maximize inverter performance and avoid inverter operation error caused by software bugs.
  • Page 57 REFUsol 20K-2T (853P020.200) User manual Step 7：Input the password, if password is correct, and then begin the update process. Step 8： System update main DSP, slave DSP and ARM in turns. If main DSP update success, the LCD will display “Update DSP1 Success", otherwise display "Update DSP1 Fail";...
  • Page 58 REFUsol 20K-2T (853P020.200) User manual confirmation; Press the up or DOWN button to change the size of the value, and then long press the DOWN button to complete the input of the current value, and enter the setting of the next value. After setting the fourth number, long press the DOWM button to confirm, the value selection of antiReflux power can be completed.

  • Page 59: Trouble Shooting And Maintenance

    REFUsol 20K-2T (853P020.200) 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: Check the warning message or faulty codes on the inverter information panel.
  • Page 60 REFUsol 20K-2T (853P020.200) User manual List 8-1 Even list Even Even List Event List Name Even Reason & Solution List ID Description If the alarm occurs occasionally, the possible cause is that the electric grid The power grid is abnormal occasionally. inverter...
  • Page 61 REFUsol 20K-2T (853P020.200) User manual ID08 IslandFault Islanding faulty minutes, then turn ON the “DC Grid switch”. Check whether the fault is ID09 GridOVPInstant1 instantaneous rectified. If no, please contact voltage too high 1 technical support. Grid ID10 GridOVPInstant2 instantaneous...
  • Page 62 REFUsol 20K-2T (853P020.200) User manual consistent The Grid voltage sampling value ConsistentFault_ between the ID30 Vgrid master and salve is not consistent ConsistentFault_ 3 lines' DCI ID31 consistency error SpiCommFault(D Communication ID33 Faulty （DC side） There are internal faults of inverter, turn OFF the “DC switch”...
  • Page 63 REFUsol 20K-2T (853P020.200) User manual output, and communication ReversalConnect Input reverse ID46 according to the user's manual. If the connection error use method is not ruled out, please contact the new energy customer ID47 Reserved Reserved service of Capital Airlines.
  • Page 64 REFUsol 20K-2T (853P020.200) User manual If the configuration of the PV array is Bus undervoltage correct, could be the sun irradiation ID67 BusUVP during grid is too low. Once sun irradiation back connection to normal, inverter will work back normal...
  • Page 65 REFUsol 20K-2T (853P020.200) User manual Output RMS ID85 SwAcRmsOCP current protection PV overcurrent ID86 SwPvOCPInstant software protection PV parallel ID87 IpvUnbalance unbalance Output current ID88 IacUnbalance unbalance ID89 AFCIFault Arc Fault Balanced current ID90 IBalanceOCP overcurrent protection Resonance ID91 ResOver...
  • Page 66 REFUsol 20K-2T (853P020.200) User manual AC output minutes, then turn ON the “DC ID103 HwACOCP hardware switch”. Check whether the fault is overcurrent rectified. If no, please contact Overload technical support. ID110 Overload1 Protection 1 Overload ID111 Overload2 Protection 2...
  • Page 67 REFUsol 20K-2T (853P020.200) User manual If it occurs frequently, please check whether the grid voltage and grid frequency are within the allowable range of the inverter; if not, please contact the customer service of REFU ELEKTRONIK; if yes, please check...
  • Page 68 REFUsol 20K-2T (853P020.200) User manual hardware turn OFF the “DC switch”, wait for 5 permanent fault minutes, then turn ON the “DC switch”. Check whether the fault is PV unbalance rectified. If no, please contact unrecoverIpvUn ID132 current technical support.
  • Page 69 REFUsol 20K-2T (853P020.200) User manual ID146 WiFiFault WIFI failure ID147 BluetoothFault Bluetooth failure ID148 RTCFault RTCClock failure Communication CommEEPROMF ID149 BOARD EEPROM ault error Communication CommEEPROMF ID150 BOARD FLASH ault error ID151 Reserved Reserved Satety Version is There are internal faults of inverter,...
  • Page 70 REFUsol 20K-2T (853P020.200) User manual RemoteShutdow disconnect the DC switch of the ID162 RemoteShutdown inverter, wait for 5 minutes, and then turn on the DC switch. Observe whether the fault has been Drms0 shunt eliminated after the inverter is ID163...

  • Page 71: Fan Maintenance

    Refers to below section. 8.3. Fan Maintenance For REFUSOL 20K-2T (853P020.200) series inverter with fans, if fan is broken or not working properly may cause inverter heat dissipation issue and effect the working efficiency of inverter. Thus, fans need to be regularly cleaned and maintained,...
  • Page 72 REFUsol 20K-2T (853P020.200) User manual inverter is turn off. Step 2: Unscrew four screws at the corner of fans baseboard. Figure 8-1: remove the four screws from the fan base plate. Step 3: Remove the screws at the fans position unplug the terminal at the fans and inverter interface and completely remove the fans.

  • Page 73: Technical Data

    REFUsol 20K-2T (853P020.200) User manual 9.Technical Data Outlines of this Chapter This chapter outline the REFUSOL 20K-2T (853P020.200) model type and technical parameters. Models marked are only valid in Australia. Model REFUsol20K-2T Datasheet Input (DC) Recommended 30000 Max. PV input...
  • Page 74 REFUsol 20K-2T (853P020.200) User manual Nominal grid 3/N/PE,220V/380Vac,230V/400Vac voltage Grid voltage 310Vac-480Vac (According to local standard) range Nominal 50 / 60Hz frequency Grid frequency 45Hz-55Hz/54Hz-66Hz (According to local standard) range Active power 0~100% adjustable range THDi <3% Power factor 1 default (adjustable +/-0.8)
  • Page 75 REFUsol 20K-2T (853P020.200) User manual inverter back-feed current to the array Output inrush current and 0.8A/2us duration Maximum output fault current and 200A/1us duration Maximum output overcurrent protection Communication Power According to certification and request management unit Communication RS485/USB/ Bluetooth, Optional: WIFI /Ethernet...
  • Page 76 REFUsol 20K-2T (853P020.200) User manual AS/NZS 4777, VDE V 0124-100, V 0126-1-1, VDE-AR-N 4105, Grid standard CEI 0-21/CEI 0-16, UNE 206 007-1, EN50549, G98/G99, EN50530, NB/T32004 Note: the product may be upgraded in the future. The above parameters are for reference only.

  • Page 77: Quality Assurance

    REFUsol 20K-2T (853P020.200) 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: 1. Purchase invoice provided by the customer: the first flight provides a standard warranty period of 60 months (5 years) from the invoice date.
  • Page 78 REFUsol 20K-2T (853P020.200) User manual Invalid warranty clause Equipment failure caused by the following reasons is not covered by the warranty: The "warranty card" has not been sent to the distributor or our company. Without the consent of our company to change equipment or replace parts.
  • Page 79 REFUsol 20K-2T (853P020.200) User manual Our inverters in mainland China are factory set to CQC standard regulations. Users can set different voltage protection values by importing safety regulation parameters or overvoltage protection values according to actual conditions. Too high grid voltage may lead to the normal use and service life of household appliances on the grid side, or loss of power generation.
  • Page 80 REFU Elektronik GmbH Marktstraße 185 72793 Pfullingen, GERMANY ✆ +49 7121 4332 0 ✆ +49 7121 4332 333 (Service) ℻ +49 7121 4332 140 ✉ info@refu.com ✉ service@refu.com www.refu.com/en/solar-solutions © REFU Elektronik GmbH The reproduction, distribution and utilization of this document as well as the communication of its contents to others without express authorization is prohibited.

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