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REFUSOL 20K 2-T User Manual

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Summary of Contents for REFUSOL 20K 2-T

  • Page 2 Content Preface 1. Basic Safety Information 1.1. Requirement for Installation and Maintenance 1.2. Symbols and signs 2. Product Characteristics 2.1. Intended Use 2.2. Function Description 2.3. Electrical block diagram 2.4. Efficiency and derating curve 3. Inverter Storage 4. Installation 4.1. Installation Process 4.2.
  • Page 3 6.2. Start Inverter 7. Operation interface 7.1. Operation and Display Panel 7.2. Standard Interface 7.3. Main Interface 7.4. Updating Inverter Software 7.5. Smart meter instruction 8. Trouble shooting and maintenance 8.1. Troubleshooting 8.2. Maintenance 8.3. Fan Maintenance 9. Technical Data...
  • Page 4 All rights reserved, REFU ELEKTRONIK reserves the right of final interpretation. This manual subject to modify according to user's or customer's feedback. Please check our website at http://www.refu.com for lasted version Document Updates REFUsol 20K-2T (853P020.000)
  • Page 5 Marktstraße 185 72793 Pfullingen, GERMANY www.refu.com Outline ⚫ This manual is an integral part of REFUSOL 20K-2T (853P020.000). It describes the assembly, installation, commissioning, maintenance and failure of the product. Please read it carefully before operating. Scope of Validity ⚫...
  • Page 6 Caution “Attention”indicates there are potential risks, if fail to prevent, may lead to equipment cannot normally or property damage. Attention “Note”provides additional information and tips that are valuable for the optimal operation of the product. Note REFUsol 20K-2T (853P020.000)
  • Page 7 1.1. Requirement for Installation and Maintenance Installation of REFUSOL 20K-2T (853P020.000) 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 8 Label and Symbols REFUSOL 20K-2T (853P020.000) 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 9 Air humidity should less than 90%. 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 REFUsol 20K-2T (853P020.000)
  • Page 10 Must be trained. ⚫ Completely read the manual operation and understand ⚫ Warming all information Must get permission by local utility company before connecting to grid and the connection must be done by certified electrical engineers Attention Operation REFUsol 20K-2T (853P020.000)
  • Page 11 Should not open the inverter cover without authorized permit, REFU ELEKTRONIK does not take any responsibility Attention for that. EMC/Noise Level Electromagnetic compatibility (EMC) refers to that on REFUsol 20K-2T (853P020.000)
  • Page 12 Juveniles, Disable, should not use this product. Danger Keep this product out of the reach of children Caution of burn injuries due to hot enclosure! Only touch the screen and pressing key of the inverter while it is working Caution REFUsol 20K-2T (853P020.000)
  • Page 13 REFU ELEKTRONIK will not take the responsibility Warning including warranty Signs on the Product and on the Type Label REFUSOL 20K-2T (853P020.000) has some safety symbols on the inverter. Please read and fully understand the content of the symbols before installation. Symbols...
  • Page 14 Positive pole and Positive pole and negative pole of negative pole the input voltage (DC) Indicated the temperature Temperature allowance range (Regulatory Compliance Mark) RCM logo The product complies with the requirements of the applicable Australian standards. REFUsol 20K-2T (853P020.000)
  • Page 15 Introduce the efficiency curves of the product. 2.1. Intended Use Field of use REFUSOL 20K-2T (853P020.000) 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 16 REFUSOL 20K-2T (853P020.000) may only be operated with PV arrays (photovoltaic module and cabling) for on grid condition. Do not use this product for any other or additional purposes. Any damage or property loss due to any use of the product other than described in this section, REFU ELEKTRONIK will not take the responsibility.
  • Page 17 Inverters Inverters Inverters Inverters REFUsol Inverters Figure2-2: Overview of the grid configurations. Product Dimensions The choice of optional parts of inverter should be made by a qualified technician who knows the installation conditions clearly. Dimensions Description H×W×D=430*520*189mm REFUsol 20K-2T (853P020.000)
  • Page 18 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 REFUsol 20K-2T (853P020.000)
  • Page 19 7. AC output 4. USB Port (for WIFI or Ethernet 8. Fans communication) Figure 2-6 Bottom view of the REFUSOL 20K-2T (853P020.000) 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 always kept visible.
  • Page 20 Display Board. Display Board displays fault code when inverter is abnormal operation conditions. At the same time, Control Board can trigger the replay to protect the internal components. REFUsol 20K-2T (853P020.000)
  • Page 21 Inverter or a group of inverters can be monitored remotely through advanced communication system based on RS485 interface or via USB port. F. Software update USB interface for uploading the firmware, remotely uploading by using USB acquisition stick (WIFI or REFUsol 20K-2T (853P020.000)
  • Page 22 Circuit Inverter Circuit Protect Circuit Circuit Circuit MPPT Circuit 2 Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Figure 2-8 Schematic diagram 2.4. Efficiency and derating curve Vpv=480v Vpv=650v Vpv=850v 100% %of Rated Output Power Figure 2-9 Power efficiency curve REFUsol 20K-2T (853P020.000)
  • Page 23 180 190 200 210 220 230 240 250 260 270 280 290 300 Vgrid (V) Figure 2-10 Rated Power ratio vs Grid Voltage REFUsol 20K-2T (853P020.000)
  • Page 24 The maximum stacking layer number cannot exceed 4 ⚫ layers. If the inverter be storage for more than half years, the ⚫ inverter needs to be fully examined and tested by qualified service or technical personnel before using. REFUsol 20K-2T (853P020.000)
  • Page 25 Caution Consider the weight of this product when doing transport and moving. Choose an appropriate mounting position and surface. Attentio At least two persons for installation 4.1. Installation Process 4.2. Checking Before Installation Checking Outer Packing Materials REFUsol 20K-2T (853P020.000)
  • Page 26 Figure 4-1: Components and mechanical parts that are inside the package Pictures Description Quantity REFUSOL 20K-2T 1 PCS (853P020.000) Rear Panel 1 PCS M8*80 Hexagon 3 PCS screws PV+ input 4 PCS connector REFUsol 20K-2T (853P020.000)
  • Page 27 PV- input 4PCS connector PV+ metal pin 4PCS PV- metal pin 4PCS M6*12 Hexagon 2 PCS screws Manual 2PCS Outgo inspection 1PCS report R-type terminal 5PCS Communication 1PCS Terminal REFUsol 20K-2T (853P020.000)
  • Page 28 Note： The first communication terminal is used as a default example in the description of the machine appearance in the manual. REFUsol 20K-2T (853P020.000)
  • Page 29 AC power cable. Screwdriver remove connectors from product Removal Tool Remove PV Connector Wire Stripper Used to peel cable M6 use to uninstall and M6 hexagon install the front top cover wrench and down cover REFUsol 20K-2T (853P020.000)
  • Page 30 Level properly installed Installer wear when ESD gloves installing product Safety Installer wear when goggles installing product Installer wear when Mask installing product 4.4. Determining the Installation Position Select an appropriate location to install the product to REFUsol 20K-2T (853P020.000)
  • Page 31 When selecting a location for the inverter, consider the following: Note: install vertical or backward tilt within 0-15° , Do not install forward or upside down! Figure 4-1 Installation Position Selection REFUsol 20K-2T (853P020.000)
  • Page 32 Figure 4-2 Clearance for single inverter Figure 4-3 Clearance for multiple inverters 4.5. Moving of inverter Unload the inverter from package, horizontally move to the REFUsol 20K-2T (853P020.000)
  • Page 33 When place inverter on the floor, put it above foam or paper to avoid the damage of the shell of inverter. 4.6. Installation Step 1: Placed the rear panel on the mounting wall, determine the mounting height of the bracket and mark REFUsol 20K-2T (853P020.000)
  • Page 34 M8*80 Hexagon screws. Figure 4-6 Installation instruction (1) Step 4：Lift the inverter and hang it on the rear panel and fixing both side of inverter with M6 screw (accessories). REFUsol 20K-2T (853P020.000)
  • Page 35 Figure 4-7 Installation instruction (2) Step 5：User can use a lock to block the inverter in case of stealing (Optional) REFUsol 20K-2T (853P020.000)
  • Page 36 PV modules or disconnect PV string DC switch. PV arrays will produce dangerous voltage if it is exposure under Danger For this product, the open circuit voltage of PV strings should not greater 1100V Note The connected panel must meet the standard IEC61730A。 REFUsol 20K-2T (853P020.000)
  • Page 37 5.2. Grounding Connection (PE) Connect the inverter to the grounding electrode using ground cable. REFUSOL 20K-2T (853P020.000) is a transformer less inverter which requires the positive pole and negative pole of the PV array are NOT grounded. Otherwise, it will cause Note inverter failure.
  • Page 38 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. REFUsol 20K-2T (853P020.000)
  • Page 39 1. M6 screw 2. OT terminal 3. threaded hole Figure 5-4 Inverter external grounding instruction diagram 5.3. Connect grid side of inverter (AC-Output) REFUSOL 20K-2T (853P020.000) connect to utility grid by using AC power cable. The AC connection must meet the requirement of local grid operator.
  • Page 40 PV cable and ensure the power loss is less than 1%. Meanwhile, the inverter AC side to grid connection point must less than 100m. the relation between cable length, cross section area and power loss as below: REFUsol 20K-2T (853P020.000)
  • Page 41 Multi -Core cable Cable Figure 5-7 REFUSOL 20K-2T (853P020.000) 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 REFUsol 20K-2T (853P020.000)
  • Page 42 Insulating sleeve, RNBS14-6 (8awg). terminal shall not be exposed. Figure 5-9 AC cable connection instruction diagram (1) Step 3: After assembling the PG waterproof connector, connect the cable to the AC terminal block L1, L2, L3, N, PE REFUsol 20K-2T (853P020.000)
  • Page 43 Copper cable cross section area Cable OD (mm) （mm ） 2.5~6.0 6.0~9.0 Table 5-2: Recommend DC cable size. Step1: Find the metal contact pins in the accessories bag, connect the cable according below diagram (1. Positive cable, 2. negative cable)； REFUsol 20K-2T (853P020.000)
  • Page 44 “click”, the pin tact assembly is seated correctly. (3. Positive Connector, 4. negative connector); Figure 5-13: DC cable connection (3) Step 4: Measure PV voltage of DC input with multimeter, verify DC input cable polar and connect DC connector with REFUsol 20K-2T (853P020.000)
  • Page 45 Dealing ： If need to remove the PV connector from inverter side, please use the Removal Tool as below diagram, move the connector gently. Before, moving the positive and negative connector, please make sure “DC Switch” is on OFF position. NOTE REFUsol 20K-2T (853P020.000)
  • Page 46 When layout the wiring diagram, please separate the communication wiring and power wiring in case the signal be affected. Note REFUSOL 20K-2T (853P020.000) inverter has one USB Port and one COM Port, as shown in the following figure. Zoom in 1.USB Port 2.COM Port...
  • Page 47 5.5.2. COM—Multi function communication port Table 5-3: Recommend COM cable size Outer diameter Area Name Type (mm) (mm²) RS485 Outdoor shielded twisted Communicati pair meets local 2 or 3core：4~8 0.25~1 on Wire standards Port Description： REFUsol 20K-2T (853P020.000)
  • Page 48 Wire connection Electric meter Electric meter Electric meter RS485B RS485 signal- As RS485 signal Communication GND.S ground or DRMS ground port ground Remote shunt DRM0 down DRM1/5 DRMS port DRMS port logical DRM2/6 DRM3/7 DRM4/8 Blank PIN REFUsol 20K-2T (853P020.000)
  • Page 49 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. REFUsol 20K-2T (853P020.000)
  • Page 50 Figure 5-18: Picture of the RS485/USB converter and PC terminal If only one REFUSOL 20K-2T (853P020.000) 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 (853P020.000) connecting communications.
  • Page 51 Figure 5-20: Multi REFUSOL 20K-2T (853P020.000) connecting Communications. Register remote monitoring of REFUSOL 20K-2T (853P020.000) at its relevant website or APP according to monitoring device SN. WIFI / Ethernet By the USB acquisition stick (WIFI / Ethernet), 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 52 The length of the RS485 communication cable should ⚫ be less than 1000 m. The length of the WIFI communication cable should ⚫ be less than 100 m. If multiple REFUSOL 20K-2T (853P020.000) are ⚫ connected monitoring device over RS485/USB converter, a maximum of 31 inverters can Note be connected in a daisy chain.
  • Page 53 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 (853P020.000) inverter will start automatically. Screen showing “normal” indicates correct operation.
  • Page 54 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 —— trouble shooting for help. REFUsol 20K-2T (853P020.000)
  • Page 55 7. Operation interface Outlines of this chapter This section introduces the display, operation, buttons, and LED indicator lights of REFUSOL 20K-2T (853P020.000) Inverter. 7.1. Operation and Display Panel Buttons and Indicator lights GFCI lamp Up button Normal lamp Down button...
  • Page 56 PV input current and voltage, grid voltage, current and frequency, today generation, total generation. Inverter working status, PV 1 input voltage and current. Inverter working status, PV 2 input voltage and current REFUsol 20K-2T (853P020.000)
  • Page 57 Inverter working status, PV generated power Inverter working status, today generated electricity Inverter working status, total generated electricity Inverter working status, grid voltage and current Inverter working status, grid voltage and frequency Inverter working status, USB status REFUsol 20K-2T (853P020.000)
  • Page 58 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. REFUsol 20K-2T (853P020.000)
  • Page 59 LCD display interface as shown in the figure below. 7.3. Main Interface Long press the down button under standard interface to enter into main interface, Main interface including below information: ---------Long press DOWN button Normal 1.Enter Setting REFUsol 20K-2T (853P020.000)
  • Page 60 Enter Setting" and long press to enter the setting menu. You can select the content you want to set by short pressing the button. Note1: Some settings need to enter the password (the default password is 0001), when entering the password, REFUsol 20K-2T (853P020.000)
  • Page 61 USB and insert USB into inverter communication port. Table 7-1 Country code setting country country country Germany Korea Thailand PEA N4105 CEIO-21 Thailand Sweden Internal Europe LV-Range- Australia General 50HZ Spain CEIO-21 EU EN50549 1699 External Turkey Cyprus South Africa Denmark India AU-WA REFUsol 20K-2T (853P020.000)
  • Page 62 VDE 0126 Italy CE10-16 Mexico UK.G83 Arrete23 Greece Denmark island Tr322 Wide- EU EN50438 Range-60 IEC EN61727 Ireland 5. On-Off Control Inverter on-off local control. 6. Set Energy Set the total power generation. You can modify the REFUsol 20K-2T (853P020.000)
  • Page 63 The default Modbus protocol is used, and the address is 01. 8. Set Input mode REFUSOL 20K-2T (853P020.000) has 2 MPPT circuit, each MPPT circuit can work interdependently, or divided into parallel mode. User can change the setting according to the configuration.
  • Page 64 14. Reflux Mode 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.
  • Page 65 After importing the safety files, you can switch safety standards according to the operation prompts. 23. Autotest Fast 18.Autotest Start Autotest Long press the “∨” to Fast start Testing 59.S1... ↓ Wait REFUsol 20K-2T (853P020.000)
  • Page 66 Testing 27.S2... ↓ Wait Test 27.S2 OK! ↓ Wait Testing 81>S1... ↓ Wait Test 81>S1 OK! ↓ Wait Testing 81>S2… ↓ Wait Test 81>S2 OK! ↓ Wait Testing 81<S1... ↓ Wait Test 81<S1 OK! ↓ Wait Testing 81<S2... REFUsol 20K-2T (853P020.000)
  • Page 67 ↓ Short press the“∨” 59.S2: 229V 204ms ↓ 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 REFUsol 20K-2T (853P020.000)
  • Page 68 Short press the“∨” 81<.S1 50.0Hz 105ms ↓ Short press the“∨” 81<.S2 threshold 47.5Hz 100ms ↓ Short press the“∨” 81<.S2 50.1Hz 107ms 24. Autotest STD 19.Autotest Long press the “∨” The test procedure is same as Autotest Fast, but it’s REFUsol 20K-2T (853P020.000)
  • Page 69 (Display the event sequence number, information event ID number, and event occurrence time) (A) “SystemInfo” Interface as below 3.SystemInfo ------Long press DOWN button 1.Inverter Type 13.Reflux Power 2.Serial Number 14.DRMs0 3.General Soft Ver 15.DRMn 4.General Hard Ver 16.MPPT Scan REFUsol 20K-2T (853P020.000)
  • Page 70 ELEKTRONIK will provide the new update software called firmware for user if it is necessary, the user needs to copy the upgrade file to the USB flash disk. 7.4. Updating Inverter Software REFUSOL 20K-2T (853P020.000) inverter offer software REFUsol 20K-2T (853P020.000)
  • Page 71 Step 4 ： Insert USB flash disk into the USB port of inverter. Step 5 ： Then turn on DC switch, screen show “recoverable fault” (as AC circuit breaker still open, inverter cannot detect grid power, so it may show “recoverable REFUsol 20K-2T (853P020.000)
  • Page 72 Note: If screen shows “Communication fail”, “Update DSP1 fail”, “Update DSP2 fail” please turn off the DC switch, wait for the LCD screen turn off, then turn on the DC switch again, then continue to update from step 5. REFUsol 20K-2T (853P020.000)
  • Page 73 (initial password is 0001), the power setting can be entered by pressing the UP or DOWN button to find the "Reflux Enable", and Long press the DOWN button for confirmation; Press the up or DOWN button to change the REFUsol 20K-2T (853P020.000)
  • Page 74 Anti-Reflux: limit the energy sent to the grid Positive power: the power purchased Negative power: the power of selling electricity To use the feed-in limitation function, an external SmartMeter has to be connected to measure the power flow at the PCC: REFUsol 20K-2T (853P020.000)
  • Page 75 3-phase SmartMeter Chint DTSU666 924028 Smart Meter (3-phase) 3-phase Smart Meter Chint DTSU666 (direct connection up to 80A) 924029 CT Kit 600A (for DTSU 1 current transformer 600A/5A to SmartMeter) connect to 3-phase SmartMeter Chint DTSU666 REFUsol 20K-2T (853P020.000)
  • Page 76 — Are the cable cross section area and length meet the requirement? — Are the input and output connection and wiring in good condition? — Are the configuration settings correctly for the particular installation? This section contains the potential errors, resolution REFUsol 20K-2T (853P020.000)
  • Page 77 AC circuit breaker and AC wiring of the inverter. If the grid The power voltage/frequency is grid ID03 GridOFP within the acceptable frequency is range and AC wiring is too high correct, while the alarm REFUsol 20K-2T (853P020.000)
  • Page 78 “DC switch”, wait for 5 faulty minutes, then turn ON Grid the “DC switch”. Check GridOVPInst instantaneous ID09 whether the fault is ant1 voltage too rectified. If no, please high 1 contact technical support. GridOVPInst Grid ID10 ant2 instantaneous REFUsol 20K-2T (853P020.000)
  • Page 79 GFCIDevice ID22 sampling（AC minutes, then turn ON Fault(AC) the “DC switch”. Check side） whether the fault is Current rectified. If no, please HwADFaultI Branch ID23 contact technical support. dcBranch sampling faulty HwADFaultI DC input ID24 current REFUsol 20K-2T (853P020.000)
  • Page 80 Faulty ult(AC) whether the fault is （AC side） rectified. If no, please Chip Faulty ID35 SChip_Fault contact technical support. （DC side） Chip Faulty ID36 MChip_Fault （AC side）） HwAuxPowe Auxiliary ID37 rFault power fault ID41 RelayFail Relay faulty REFUsol 20K-2T (853P020.000)
  • Page 81 It is internal fault of ID48 SNTypeFault match Type inverter. ID49 Reserved Reserved Ensure the installation Heat sink1 position and installation TempFault_ over- ID50 method meet the HeatSink1 temperature requirements of this user protection manual. ID51 Reserved Reserved REFUsol 20K-2T (853P020.000)
  • Page 82 If the configuration of the PV array is correct, could be the sun irradiation is undervoltage ID67 BusUVP too low. Once sun during grid irradiation back to connection normal, inverter will work back normal REFUsol 20K-2T (853P020.000)
  • Page 83 “DC switch”, wait for 5 Output minutes, then turn ON SwOCPInsta instantaneous ID83 the “DC switch”. Check current whether the fault is protection rectified. If no, please BuckBoost contact technical support. SwBuckBoo ID84 software stOCP overcurrent REFUsol 20K-2T (853P020.000)
  • Page 84 Arc Fault Balanced IBalanceOC current ID90 overcurrent protection Resonance ID91 ResOver protection Output cycle- by-cycle SwAcCBCFa ID92 Tripping software protection PV Branch SwPvBranch overcurrent ID93 software protection HwLLCBusO LLC hardware ID97 overvoltage Inverter bus ID98 HwBusOVP hardware overvoltage REFUsol 20K-2T (853P020.000)
  • Page 85 Check whether the inverter has dust and dust, whether there are foreign matters blocking the fan at the air inlet. If so, please improve the ventilation and heat dissipation of the REFUsol 20K-2T (853P020.000)
  • Page 86 With the approval of the local power operator, please contact the customer service to modify the protection points of over / under voltage and over / REFUsol 20K-2T (853P020.000)
  • Page 87 OFF the “DC fault switch”, wait for 5 minutes, then turn ON PV unbalance the “DC switch”. Check unrecoverIp current ID132 whether the fault is vUnbalance permanent rectified. If no, please fault contact technical support. ID133 Reserved Reserved REFUsol 20K-2T (853P020.000)
  • Page 88 5 ID140 permanent layFail minutes, then turn ON fault the “DC switch”. Check whether the fault is unrecoverV Unbalanced rectified. If no, please ID141 busUnbalan permanent contact technical support. fault LightningPr ID142 otectionFaul DC SPD failure REFUsol 20K-2T (853P020.000)
  • Page 89 “DC switch”. Check is Fault whether the fault is SciCommLo rectified. If no, please communicatio ID153 se(DC) contact technical support. n（DC side） SciCommLo communicatio ID154 se(AC) n（AC side） communicatio SciCommLo n（DC current ID155 se(Fuse) combined side） REFUsol 20K-2T (853P020.000)
  • Page 90 FanFault2 Fan 2 Alarm inverter has dust and ID171 FanFault3 Fan 3 Alarm dust, whether there are foreign matters blocking ID172 FanFault4 Fan 4 Alarm the fan at the air inlet. If ID173 FanFault5 Fan 5 Alarm REFUsol 20K-2T (853P020.000)
  • Page 91 Before the cleaning, make sure that the DC SWITCH is turned OFF and the circuit breaker between inverter and electrical grid is turned OFF. Wait at least for 5 minutes before the Cleaning. Inverter cleaning  REFUsol 20K-2T (853P020.000)
  • Page 92 Fan cleaning  For inverter REFUSOL 20K-2T (853P020.000) with fans, please check if inverter have abnormal sound when inverter is operating. Check if fan on cracks, replace a new fan when necessary. Refers to below section.
  • Page 93 Figure 8-2: remove the fan and protective cover Step 4: Use a soft brush to clean the fan. If it is damaged, please replace it in time. Step 5: Re-install the inverter according to the above steps. REFUsol 20K-2T (853P020.000)
  • Page 94 9. Technical Data This chapter outline the REFUSOL 20K-2T (853P020.000) model type and technical parameters. Model REFUsol 20K-2T Datasheet Input (DC) Recommended Max. PV input 30000Wp power Number of MPP trackers Number for DC inputs Max. input voltage 1100V Start-up voltage...
  • Page 95 Active power 0~100% adjustable range THDi <3% Power factor 1 default (adjustable +/-0.8) Performance Max efficiency 98.60% European weighted 98.20% efficiency Self-consumption <1W at night MPPT efficiency >99.9% Protection DC reverse polarity protection Anti-islanding protection REFUsol 20K-2T (853P020.000)
  • Page 96 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 General Data Ambient -30℃~+60℃ temperature range Topology Transformer-less REFUsol 20K-2T (853P020.000)
  • Page 97 IEC62109-1/2, IEC62116, IEC61727, IEC61683, Safety standard IEC60068(1,2,14,30) VDE-AR-N 4105, Grid standard UNE 206 007-1, EN50549 Note: the product may be upgraded in the future. The above parameters are for reference only, please refer to the website for up-to-date user manual. REFUsol 20K-2T (853P020.000)
  • Page 98 All rights reserved in the event of the grant of a patent, utility model or design. The data specified is only used to describe product should not be interpreted as warranted characteristics in the legal sense. The right change content of this documentation and the availability of the products are reserved. REFUsol 20K-2T (853P020.000)

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