Download
Share
Print this page
  1. Manuals
  2. Brands
  3. REFUSOL Manuals
  4. Inverter
  5. 20K-3T
  6. User manual

REFUSOL 20K-3T User Manual

Photovoltaic string inverter
Hide thumbs

Advertisement

Quick Links

Download this manual
©
I REFU Elektronik GmbH, 2024 I All righrs reserved

Advertisement

loading
Need help?

Need help?

Do you have a question about the 20K-3T and is the answer not in the manual?

Questions and answers

Related Manuals for REFUSOL 20K-3T

Summary of Contents for REFUSOL 20K-3T

  • Page 1 © I REFU Elektronik GmbH, 2024 I All righrs reserved...
  • Page 2 Table of Content 1. About this manual 1 1.1. Copyright declaration 1 1.2. Structure of the manual 1 1.3. Scope 1 1.4. Target group 2 1.5. Symbols used 2 2. Basic safety information 4 2.1. Safety information 4 2.2. Symbols and signs 8 3.
  • Page 3 5.2. Electrical connection 29 5.3. Connections 29 5.4. Connecting the PE cables 30 5.5. Connecting the DC cables 31 5.6. Connecting the AC power cables 34 5.7. Communication ports 39 5.8. Energy meter connection 44 5.9. System monitoring 47 6. Commissioning the inverter 52 6.1.
  • Page 4 This manual contains important safety and installation instructions that must be observed during installation and maintenance of the device. 1.3 Scope This product manual describes the installation, electrical connection, commissioning, maintenance and fault elimination procedures of the REFUsol 20K-3T/25K-3T/33K3T/50K-4T inverters. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 5 This manual contains information on safe operation and uses symbols to ensure the safety of persons and property as well as the efficient operation of the inverter. Please read through the following symbol explanations carefully in order to prevent injury or property damage. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 6 Follow the warnings in order to prevent injury! ATTENTION Non-observance may result in property damage! Follow the warnings in order to prevent damage to or destruction of the product. NOTE Provides tips essential to the optimal operation of the product. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 7 Not doing this may result in serious injury. 2.1.1 Qualified personnel Personnel tasked with the operation and maintenance of the device must have the qualifications, competence and experience required to perform the described tasks, while also being capable of fully understanding all instructions REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 8 2.1.3 Transport requirements The factory packaging is specifically designed to prevent transport damage, i.e. violent shocks, moisture and vibrations. However, the device must not be installed if it is REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 9 • All installations and electrical connections may only be carried out by trained electricians! IMPORTANT Authorisation for grid feed-in • Obtain authorisation from the local power grid operator before connecting the inverter to the public power grid. NOTE Voiding of guarantee REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 10 2.1.6 Operation CAUTION Burning due to hot housing • While the inverter is being operated, several internal components will become very hot. • Please wear protective gloves! • Keep children away from the device! 2.1.7 Repair and maintenance DANGER REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 11 • The PV generator must be earthed in accordance with the requirements of the local power grid operator! • For reasons of personal safety, we recommend that all PV module frames and inverters of the PV system are reliably earthed. WARNING REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 12 five minutes to ensure that the capacitor has been fully discharged. Caution! Danger through electric shock Caution! Hot surface The product is compliant with EU guidelines Earthing point Please read the manual before installing the inverter REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 13 Positive and negative poles of the DC input voltage The inverter must always be transported and stored with the arrows pointing upward The temperature range in which the inverter can operate RCM (Regulatory Compliance Mark) The product meets the requirements of the applicable Australian standards. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 14 This chapter describes the product features, dimensions and efficiency levels. 3.1 Product dimensions The REFUsol 20K-3T/25K-3T/33K-3T/50K-4T is a grid-coupled PV inverter which converts the direct current generated by PV systems into a three-phase alternating current and feeds it into the public power grid. The AC circuit breaker and DC switch are used as a disconnecting device and must be easily accessible.
  • Page 15 3.2 Power grid types REFUsol 20K-3T/25K-3T/33K-3T/50K-4T are compatible with the following grid types: NOTE • For the TT grid, voltage between N and PE should be less than 30 V. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 16 3.3 Product dimensions All REFUsol 20K-3T/25K-3T/33K-3T/50K-4T have the following dimensions: H × W × D = 480 mm × 585 mm × 220 mm front, side, back bottom view 4-12.0 126.0 126.0 403.0 36.0 wall bracket REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 17 NOTE • REFUsol 20K-3T/25K-3T/33K-3T inverters support 6-channel PV string input. • REFUsol 50K-4T and the HV models support 8-channel PV string input. 3.4 Labelling on the device Labelling must not be covered or removed! 3.5 Functional features The DC output generated by the PV generator is filtered by the input board before it reaches the power board.
  • Page 18 Data transfer The inverter (or a group of inverters) can be monitored remotely via the RS485 communication bus or via WiFi/GPRS. Software update The device supports local updates via USB stick and remote updates via WiFi/GPRS. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 19 3.5.2 Electrical block diagram 3.6 Efficiency curve Power efficiency curve (REFUsol 50K-4T) REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 20 Rated power ratio vs. Grid voltage REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 21 • Do not set down the inverter upside-down. 4.2 Installation procedure Mechanical installation is performed as follows: Examine the inverter before installation Prepare the installation Select an installation location 4. Transport the inverter Mount the rear panel Install the inverter REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 22 24 hours before installing the inverter. 4.3.2 Checking the delivery scope Image Description Quantity Inverter REFUsol 20K-3T/25K-3T/33K-3T/50K-4T Wall bracket AC waterproof cover M6*60 Hexagon screws PV+ metal pin 6 / 8* PV-metal pin 6 / 8* REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 23 AC terminal insulation partition COM terminal R-type terminal (PE) R-type terminal (L1/L2/L3/N) Documents After unpacking the inverter, check that the delivery items are both intact and complete. In the event of any damage or missing components, contact the wholesaler. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 24 AC terminal Removal tool Used to remove the PV terminal Wire stripper Used to strip the wire M6 Allen key Used to turn the screw to connect the rear panel to the inverter. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 25 Used to crimp power cables Multimeter Used to check the earthing Marker Used for marking Measuring tape Used to measure distances Spirit level Used to align the wall bracket ESD gloves for the installer Safety goggles for the installer REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 26 Socket wrench Used to install the expansion bolts Hammer Used to install the expansion bolts 4.5 Installation location Choose a suitable position for the installation of the inverter. Ensure that the following requirements have been fulfilled: REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 27 Minimum distances for individual REFUsol 20K-3T/25K3T/33K-3T/50K-4T inverters: Minimum distances for several REFUsol 20K-3T/25K3T/33K-3T/50K-4T inverters: REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 28 4.6 Unpacking the inverter Open the packaging and have at least two people grip underneath the inverter at both sides. Lift the inverter out of the packaging and move it to its installation position horizontally. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 29 Put the wall bracket aside and drill the holes. 2. Fasten the rear panel to the wall using the M8*80 screws. 3. Place the inverter in the wall bracket. Secure the inverter to the wall bracket using the M6 hexagon screw. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 30 REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 31 5 Electrical connections 5.1 Safety instructions This topic describes the electrical connections of the inverter REFUsol 20K-3T/25K-3T/33K-3T/50K-4T. Read this section thoroughly and carefully before connecting the cables. DANGER Electrical voltage at the DC connections • Ensure that the DC switch is OFF before establishing the electrical connection.
  • Page 32 Max. PV Panel Model Max. AC output current REFUsol 20K-3T 33.3A REFUsol 25K-3T 42.4 A 3*50 A REFUsol 33K-3T 56.0 A REFUsol 50K-4T 4*50 A 83.3 A 5.2 Electrical connection The electrical connection is established as follows: • Connect PE cable •...
  • Page 33 In the PV system, not all live metal parts (e.g. PV module frames, PV frame, generator connection box housing, inverter housing) require earthing. 1. Remove the insulation of the cable. For outside use, cables of > 16mm² are recommended for earthing). REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 34 Crimp the cable to the ring terminal. Recommended OT terminal: OT-M6. 3. Tighten the crimped ring terminal with the M6 screw by using a torque wrench of 5 to 7 Nm: 5.5 Connecting the DC cables NOTE Maximum tolerance voltage ≥ 1100 V • REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 35 Cable outside diameter: 6 ... 9 mm • Insert the positive and negative DC cables into the corresponding cable glands. ① Positive DC cable ② Negative DC cable 2. Use a crimping plier to crimp the DC cables. CAUTION REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 36 5. Connect the DC connector to the inverter. Removing the connectors CAUTION Danger of DC arcing • Before removing the plus and minus connector, ensure that the DC switch has been set to OFF. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 37 • The AC disconnecting device must be easily accessible. NOTE • The inverter REFUsol 20K-3T/25K-3T/33K-3T/50K-4T has a built-in AFI (univ. sensitive residual current protection). If an external AFI is required, we recommend an AFI type A or B RCD featuring a residual current of 100 mA or more.
  • Page 38 Multi-core AC circuit Cu/Al cable (mm outdoor breaker REFUsol cable specifications (mm) L/N end PE end REFUsol 20K-3T 12.0 ... 35.0 12.0... 25.0 <50 50A/230V/3P REFUsol 25K-3T 16.0 ... 35.0 16,0 ... 35,0 <50 63 A/230 V/3P REFUsol 33K-3T 16,0 ... 35,0 16,0 ...
  • Page 39 You need to use five core outdoor cables, the recommended AC cable and residual current device (RCD) can be used as below table: If a RCD is required under local regulations, REFUsol recommends a type A or B RCD with sensitivity of 100 mA or higher.
  • Page 40 Remove the waterproof cover with a screwdriver, and remove the stopper from the waterproof cable gland; 2. Select the suitable cable according to the table above. Remove the insulating layer of the AC output cable using a wire stripper REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 41 M8 screws (6 ... 10 Nm) and M6 screws (5 ... 7 Nm). Then tighten the AC cover screws (2 ... 3 Nm); NOTE • When an aluminum cable is used, a copper/aluminum conversion terminal is required. This is supplied together with the copper terminals. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 42 5.7 Communication ports The REFUsol 20K-3T/25K-3T/33K-3T/50K-4T inverters come with one of the following two COM ports and one USB port. 1:USB Port 2:COM Port COM port type I COM port type II 5.7.1 USB port The USB port can be used to update the inverter's software version, or for connecting a WiFi-stick or Ethernet cable.
  • Page 43 5.7.2 COM port Please follow below steps to install the COM cable according to the correct COM port (check the corresponding type A or B): Please refer to below table for the specific PIN assignments. Function Pin Definition Note REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 44 150 ms. NOTE • The DRM0 inputs need a 15kΩ resistor in series to the input to feed-in power! DRMs for AS/NZS 4777.2:2015 and AS/NZS 4777.2:2020 Also known as Inverter Demand Response Modes (DRMs). REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 45 Supported DRM commands are pre-configured: DRM0, DRM5, DRM6, DRM7, DRM8: Function Definition Note Digital Input Grounding GND.S Signal GND DRMs/Logic DRM0 Remote Interface shutdown DRM1/5 0% power DI 5 feed-in DRM2/6 50% power DI 6 feed-in DRM3/7 75% power DI 7 feed-in REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 46 The inverter remains in the reduced power mode as long as the input is closed. Function Pin Definition Note Digital Input Grounding GND.S Signal GND DRMs/Logic DRM0 Remote Interface shutdown DRM1/5 0% power DI 5 feed-in REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 47 • Also, the power levels in percentage can be adjusted if needed 5.8 Energy meter connection To use the feed-in limitation function, a SmartMeter is required to measure the power flow at the point of common coupling (PCC). REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 48 1 current transformer, DTSU 200A/5A to connect to SmartMeter) 3-phase SmartMeter Chint DTSU666 924028 Smart Meter 3-phase Smart Meter Chint (3-phase) DTSU666 (direct connection up to 80A) 924029 CT Kit 600A (for 1 current transformer DTSU 600A/5A to connect to REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 49 Hard Feed-in Control When the Hard Feed-in Control is activated, the inverter shuts down whenever the setpoint is exceeded Ctrl.Total Power Limit the power of the feeding-in phases to the setpoint. Ignore the phases where energy is bought from the grid (standard-setting) REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 50 (i.e. Germany) Ctrl.Selling Power Limit the feed-in power of each phase to 1/3 of the setpoint 5.9 System monitoring The REFUsol 20K/25K-3T/33K-3T/50K-4T inverters provide various communication methods for the system monitoring: RS485 or WiFi stick (standard), GPRS or Ethernet stick (optional).
  • Page 51 • The Stick Loggers are using the outgoing TCP port 10000, which could be blocked in some internet routers 5.9.3 REFUlog – Monitoring portal The REFUsol inverter can be connected to the monitoring portal REFUlog using direct Ethernet connection to the internet, or via RS485 and the REFUcontrol data-gateway.
  • Page 52 5.9.4 Configuration of the WiFi stick via the web browser Preparation: The WiFi stick is installed in accordance with the previous section and the REFUsol inverter must be in operation. Carry out the following steps in order to configure the WiFi stick: 1.
  • Page 53 Flashing (1 sec.): Communication with with inverter nverter On: Logger connected to inverter Off: No connection to inverter READY Logger status Flashing (1 sec.): Normal status Flashing (0.1 sec.): Reset running Off: Error status Reset button Keystroke Description REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 54 The Ethernet stick is delivered with DHCP as standard, so it automatically gets an IP address from the router. If you wish to set up a fixed IP address, connect a PC to the Ethernet stick and open the configuration page via the web address 10.10.100.254. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 55 • REFU Elektronik GmbH is not responsible for the consequences of selecting the incorrect country code. • The selected country code influences the device grid monitoring. The inverter continuously checks the set limits and, if required, disconnects the device from the grid. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 56 7 Operation of the device This chapter describes the LCD and LED displays of the REFUsol 20K-3T/25K-3T/33K-3T/50K-4T 7.1 Control panel and display field 7.1.1 Buttons and display lights 1.1.1.2. Buttons Button Name Description Short press: Select previous menu item Long press: Exit menu or current interface...
  • Page 57 The inverter checks the insulation resistance, relays and other safety requirements. It will also carry out a self-test to ensure that its software and hardware are functioning faultlessly. If an error or a fault occurs, the inverter will go into the “Error” or “Continuous” REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 58 Hold the down button to show the main menu. Main menu 1. Enter Settings See “Settings” 2. Event list See “Set country codes” 3. System Info information See System information menu 4. Display time See Display time 5. Software update See Firmware update REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 59 Either parallel mode or independent mode may be selected. 9. Set language Sets the display language of the inverter 10. Set Feed-in Limit Through this function the feed-in limitation function can be enabled or disabled. 11. Logic interface Activates or deactivates logical REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 60 Set the Power Limit percent value. 17.ReactivePara Set the Reactive Para enable/disable. 18.Hard Reflux Set the Hard Reflux enable/disable. After hard countercurrent prevention is enabled, set the hard countercurrent power percentage 19.Set Insulation Set the Insulation enable/disable. Set the insulation impedance after the REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 61 REFU Elektronik GmbH for the specific steps. 7.4.1 Password Several settings require a password to be entered (the standard password is 0001). When entering the password, press briefly to change the figure and press and hold to confirm the current figure. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 62 7.4.2 System information menu 1.Inverter Type 13.Reflux Power 2.Serial Number 14.DRMs0 3.General Soft Ver 15.DRMn 4.General Hard Ver 16.MPPT Scan 5.Protocol Ver 17.Force Control 6.Safety 18.PCC Select 7.Safety SwVer 19.PV-ISO 8.Safety HardVer 20.GFCI 9.Modbus Address 21.PV Strings 10.Input Mode 22.Reactive Power REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 63 Switch on the DC switch and go to menu item “5. Software update” on the LCD display. Enter the password (the standard password is 0715). The system will then successively update the main DSP, auxiliary DSP and ARM processors. Pay attention to the displays. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 64 LCD screen goes out Re-establish a watertight communication connection 12. Switch the DC and AC circuit breaker back on 13. You can check the current software version in item “3. Software version” of the SystemInfo menu. 14. Troubleshooting handling REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 65 This inverter is compliant with IEC 62109-2 Clause 13.9 for earth fault protection. If an earth fault alarm occurs, the error is displayed on the LCD screen, the red light illuminates and the error can be found in the error history log. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 66 NOTE • In the case of devices equipped with a stick logger, the alarm information can be viewed on the monitoring portal and retrieved via the smartphone app. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 67 LVRT function disrupted Check whether the grid voltage is fluctuating Vovrthigh OVRT function strongly. disrupted PVOVP The input voltage is too Check whether too many PV modules have been high switched in series and correct this if required. The REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 68 ID15-ID24 are internal high and has triggered errors of the inverter. the hardware Switch the DC switch OFF, protection wait 5 minutes and then switch the DC switch ON. AcRmsOC The grid current is too Check whether the error high REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 69 Switch the DC switch OFF, VbusUnb The bus voltage is not wait 5 minutes and then alan balanced switch the DC switch ON. Check whether the error has been rectified. If not, please contact the technical support REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 70 DC switch ON. Check whether the error Consisten The sample value of the has been rectified. If not, tFault_FG grid frequency between please contact the the master DSP and the technical support slave DSP is not REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 71 OverTem The DC/DC booster Check whether the pFault_Bo temperature is too high ambient temperature at the installation location exceeds the upper limit OverTem The ambient value. If so, improve the pFault_En temperature is too high REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 72 DC switch OFF, wait 5 minutes and then switch Unrecover The EEPROM cannot be the DC switch ON. Check WRITEEE recovered whether the error has been PROM REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 73 RemoteOf The inverter was The inverter logs ID84 in switched off through the event of a remote the remote control switch-off. Check the wiring of the remote control input and output signal connection on the communication board REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 74 Check the country setting Country and correct if required. SDfault The SD card is defective Please replace the SD card. 8.2 Maintenance Inverters do not generally require daily or routine maintenance. Before carrying out cleaning, ensure that the REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 75 Please follow below steps for maintenance: Check the connections to ensure all electric connections are turned off. Unscrew the six screws at the four corners of the fan housing: REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 76 Use a soft brush to clean the fan. In case of damage, ensure to replace it in time. Reinstall the inverter according to the above steps. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 77 1100 voltage (V) Start-up voltage (V) Rated input voltage (V) MPPT operating 180 – 1000 voltage range Full power MPPT voltage 480 – 850 510 – 850 540 – 850 range (V) Max. input MPPT current 3*40 4*40 REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 78 45 – 55 Hz / 55 – 65 Hz (according to local range standard) Active power adjustable 0 – 100% range THDi < 3% Power factor 1 default (adjustable +/-0.8) Performance Max. efficiency 98.60% 98.80% European weighted 98.20% efficiency Protection DC reverse polarity REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 79 PV: type II standard, AC: type II standard Communication Standard communicatio RS485 / USB, optional: Ethernet / WiFi n mode General Data Ambient temperature -30℃ – 60℃ range Self- consumption at <3 night (W) Topology Transformerless Degree of IP65 protection Allowable 0 – 100% relative REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...
  • Page 80 The data specified is only used to describe the product and should not be interpreted as warranted characteristics in the legal sense. The right to change the content of this documentation and the availability of the products are reserved. REFUsol 20K-3T/25K-3T/33K-3T/50K-4T...

This manual is also suitable for:

25k-3t33k-3t50k-4t