SMA

Von Erik Zaikin
16 Min. Lesezeit

Error Warning Descriptions and Solutions

  • CBT-Open: Battery thermal sensor missing or not correctly connected.

    • Cause: Faulty battery thermal sensor line.
    • Solution: Contact the installer.

  • CBT-Short: Battery thermal sensor short-circuited.

    • Cause: Faulty battery thermal sensor line.
    • Solution: Contact the installer.

  • ChargeLow: Error occurs when the battery status remains in the critical zone for an extended period, meaning the battery is not being timely recharged.

    • Cause: Possible reasons include the Sunny Island 3324/4248 can be started after removing the error to charge the battery, the system has energy available to charge the battery from the generator or the grid, the generator does not start despite the Sunny Island 3324/4248's request.
    • Solution: Check the generator fuse, fuel quantity, and disconnect electrical utilities/loads if energy consumption exceeds the supply from energy generators (e.g., PV generator).

  • CHS-Open: Appliance malfunction.

    • Solution: Contact the installer or the SMA hotline.

  • CHS-Short: Appliance malfunction.

    • Solution: Contact the installer or the SMA hotline.

  • CTR-Open: Appliance malfunction.

    • Solution: Contact the installer or the SMA hotline.

  • CTR-Short: Appliance malfunction.

    • Solution: Contact the installer or the SMA hotline.

  • FailSet: Appliance malfunction.

    • Solution: Contact the installer or the SMA hotline.

  • HotACout: The Sunny Island 3324/4248 does not start because there is voltage on the AC-Output terminals.

    • Solution: Contact the installer.

  • HS-TempOV: Heatsink overtemperature: The Sunny Island 3324/4248 has been operated for an extended period with overload.

    • Solution: Let the Sunny Island 3324/4248 stay in standby for a few minutes for the fans to cool the device. Disconnect some of the connected loads in the island grid to avoid overloading the Sunny Island 3324/4248 after a restart. If the "40-2 Autostart" parameter is set to "On", the Sunny Island 3324/4248 will automatically start once the heatsink temperature drops by 5°C.

  • INTERNAL01 to INTERNAL06: Appliance malfunction.

    • Solution: Contact the installer or the SMA hotline.

  • PRevOver: Power reversal in the generator or the grid exceeds the set limits.

    • Solution: Unlock the 20-minute block of the generator/grid by setting "Release" on the "24-3 GenOperation" parameter, or the block is automatically removed after 20 minutes.

  • RelayFail: Appliance malfunction.

    • Solution: Contact the installer or the SMA hotline if this error occurs frequently.

  • TBatHigh: Battery temperature is too high.

    • Solution: Verify battery ventilation and avoid high ambient temperatures for the battery. Provide adequate ventilation and reduce the battery charge current if necessary.

  • TR-TempOV: Transformer overtemperature: The Sunny Island 3324/4248 has been operated for an extended period with overload.

    • Solution: Let the Sunny Island 3324/4248 stay in standby for a few minutes for the fans to cool the device. Disconnect some of the connected loads in the island grid to avoid overloading the Sunny Island 3324/4248 after a restart. If the "40-2 Autostart" parameter is set to "On", the Sunny Island 3324/4248 will automatically start once the transformer temperature drops by 5°C.

  • VAC-High: Output voltage too high.

    • Solution: Check the setting of the "22-1 VacNominal" parameter.

  • VAC-Low: Output voltage too low.

    • Solution: Check the setting of the "22-1 VacNominal" parameter. See chapter 11.2 "FAQ", point 7, for explanation.

  • Short circuit in the system: Check for a possible short circuit in the system.

  • VBatHigh: Battery voltage too high.

    • Solution: Check the battery connection, external chargers with very high charge voltages, and the battery for defects with high internal resistance.

  • Error Warning: Overvoltage in the PV system.

    • Cause: The voltage of the photovoltaic field is higher than the inverter's specifications.
    • Solution: Isolate the AC circuit by opening the AC switch or breaker. Isolate the PV circuit from the inverter by opening the PV circuit breaker. If the problem persists, consult your installer.

  • Error Warning: Underperformance of the PV system.

    • Cause: The photovoltaic system is not producing the expected power output.
    • Solution: Check for possible shading on the photovoltaic panels, ensure that all connections are secure and clean, and verify the system's configuration settings. If the issue continues, contact your installer or the SMA hotline.

  • Error Warning: Battery discharge too deep.

    • Cause: The battery has been discharged below the recommended minimum voltage level.
    • Solution: Allow the battery to charge fully before restarting the system. If this condition repeats often, consider checking the battery health and system's energy consumption patterns. Consult your installer for further guidance.

  • Error Warning: AC frequency deviation.

    • Cause: The AC grid frequency is outside the acceptable range for the inverter.
    • Solution: Wait for the grid conditions to return to within the acceptable frequency range. If the inverter frequently reports this error, it may indicate unstable grid conditions. Contact your energy provider for more information.

  • Error Warning: High battery temperature.

    • Cause: The temperature of the battery has exceeded safe operating limits.
    • Solution: Ensure that the battery is located in a well-ventilated area and away from direct sunlight or other heat sources. Check the battery's thermal management system for proper operation. If the problem persists, contact your installer.

  • Error Warning: Inverter communication failure.

    • Cause: The inverter is unable to communicate with the monitoring system or other inverters in the network.
    • Solution: Check the communication cables and connections. Restart the inverter to reset the communication interface. If the error continues, there may be an issue with the inverter's internal communication hardware or firmware. Consult your installer or the SMA hotline for assistance.

  • Error Warning: Unexpected system shutdown.

    • Cause: The inverter has shut down unexpectedly due to an internal error or external influence.
    • Solution: Check the system for any external disturbances that might have caused the shutdown. Restart the inverter and monitor its performance closely. If the shutdown occurs again without an apparent reason, there may be an internal fault. Contact your installer or the SMA hotline for a detailed diagnosis.

  • Error Warning: PV input range exceeded.

    • Cause: The voltage or current from the photovoltaic panels exceeds the inverter's input specifications.
    • Solution: Verify the photovoltaic panel configuration and ensure it matches the inverter's input requirements. If necessary, reconfigure the PV array to align with the inverter's specifications. If adjustments do not resolve the issue, consult your installer for further assistance.

  • Error Warning: Excessive grid voltage fluctuation.

    • Cause: The voltage in the grid to which the inverter is connected fluctuates beyond the inverter's tolerance levels.
    • Solution: Monitor the grid voltage to confirm the fluctuations. It may be necessary to consult with the grid operator to investigate and mitigate these fluctuations. Continued operation under these conditions could harm the inverter or reduce its efficiency. If the issue persists, contact technical support for further advice.

  • Error Warning: Inverter internal error.

    • Cause: The inverter has detected an internal malfunction that could be due to hardware or software issues.
    • Solution: Reset the inverter to see if the error clears. If the error recurs, do not attempt to repair it yourself. Contact your installer or SMA's technical support for a professional diagnosis and repair. The inverter may need to be sent in for service or replacement parts.

  • Error Warning: PV system configuration error.

    • Cause: The configuration of the photovoltaic system does not match the inverter's specifications, potentially due to incorrect setup or changes in the PV array.
    • Solution: Review the system configuration, including the number of panels, their arrangement, and the overall system design. Adjust the configuration to meet the inverter's input specifications. If you're unsure how to proceed, consult with your installer or a photovoltaic system engineer.

  • Error Warning: Low output power.

    • Cause: The inverter is producing less power than expected based on the current solar conditions.
    • Solution: Check for possible causes such as shading, soiling of the PV panels, or a fault in the PV array (e.g., damaged panels or loose connections). Clean the panels if dirty and inspect for any visible damage or issues. If the problem cannot be resolved, seek professional help to diagnose the system thoroughly.

  • Error Warning: Battery communication failure.

    • Cause: The inverter cannot communicate with the battery storage system, indicating a possible issue with the communication link or battery management system.
    • Solution: Check all communication connections between the inverter and the battery. Ensure that the battery management system is powered on and functioning correctly. If communication does not resume, the issue may lie within the battery system or the inverter's communication hardware. Consult the battery manufacturer's technical support or your installer for further instructions.

  • Error Warning: Firmware update required.

    • Cause: The inverter is operating with outdated firmware, which may lead to compatibility issues or reduced performance.
    • Solution: Download the latest firmware version from the SMA website and follow the instructions for updating the inverter's firmware. Ensure the process is completed successfully to avoid any operational issues. If you encounter problems during the update, contact SMA technical support for assistance.

  • Error Warning: Grid synchronization failure.

    • Cause: The inverter is unable to synchronize with the grid frequency, possibly due to significant grid instability or a malfunction within the inverter's synchronization circuit.
    • Solution: Wait to see if the inverter can automatically recover and synchronize with the grid. If the issue is persistent and the grid is stable, the inverter may have an internal fault affecting its synchronization capability. In such cases, professional technical support is required.

High PV Voltage - DISCONNECT!
Overvoltage on the DC input can irreparably damage the inverter.
Solution: Immediately disconnect the inverter from the grid!

  1. Turn off the line protection switch.
  2. Remove the Electronic Solar Switch.
  3. Disconnect all DC plug connectors.
  4. Check the DC voltage:
  • If the DC voltage is higher than the maximum input voltage, check the system sizing or contact the PV generator installer.
  • If the DC voltage is lower than the maximum input voltage, reconnect the inverter to the PV generator as described in Chapter 5.4.4 "Connecting the PV Generator (DC)" (Page 34).
    If the message repeats, disconnect the inverter again and contact the SMA Technical Support Service (see Chapter 13 "Contact" (Page 93)).

ACVtgRPro
The average value over 10 minutes of the network voltage deviates from the allowed range. This may be due to:

  • The network voltage at the connection point is too high.
  • The network impedance at the connection point is too high.
    The inverter disconnects from the network to maintain the quality of the voltage.
    Solution: Check the network voltage at the inverter's connection point:
  • If, due to local network conditions, the network voltage is equal to or higher than 253 V, ask the network operator if it is possible to adjust the voltage at the feed-in point or if a modification of the "ACVtgRPro" parameter value for voltage quality monitoring is approved.
  • If the network voltage remains long in the tolerance range and the fault message continues to be displayed, contact the SMA Technical Support Service.

CAN
Internal communication fault.
Solution: If the anomaly occurs frequently, contact the SMA Technical Support Service.

Derating
The "Derating" condition is a normal operating condition that may occur temporarily for various reasons. If the inverter has been in Derating operating condition for at least 10 minutes, the "Derating" warning remains indicated until the device is completely turned off (in the evening).
Solution: Check the inverter's thermal dissipation as described in Chapter 8.1 "Checking Thermal Dissipation" (Page 60).

dI-Bfr / dI-Srr
The inverter has detected a drastic change in differential current. The integrated differential current monitoring is an important component for people's protection. The cause for a drastic change in differential current can be a sudden ground fault, leakage currents, or malfunction. The inverter disconnects from the network.
Solution: If the "dl-Bfr" or "dl-Srr" messages are displayed without a plausible reason, check the system insulation and verify a possible leakage to ground, as described in Chapter 9.3.1 "Checking the PV Generator's Earth Leakage" (Page 74).

dI-Mess / dI-Mess-Srr
Anomaly in the measurement of differential currents/differential current. If the anomaly occurs repeatedly, the inverter signals a constant impediment to operation.
Solution: Contact the SMA Technical Support Service.

EEPROM
Data transmission error in reading or writing from the EEPROM; the data are irrelevant for the regular operation. This anomaly does not affect the inverter's yield.
EEPROM dBh
EEPROM data fault; the device shuts down because the data loss has disabled important inverter functions.
Solution: Contact the SMA Technical Support Service.

EeRestore
One of the double records in the EEPROM is corrupted and has been rebuilt without data loss. This fault message is for informational purposes only and does not affect the inverter's yield.

Fac-Bfr / Fac-Srr / FacFast
The network frequency deviates from the allowed range ("Bfr"/"Srr"/"Fast" are internal messages not important for the user). For safety reasons, the inverter disconnects from the network.
Solution: Check the network connection and possibly measure the network frequency. If the network frequency falls within the tolerance range and the "Fac-Bfr", "Fac-Srr", or "FacFast" fault messages continue to be displayed, contact the SMA Technical Support Service.

HW-Signal
Internal measurement or hardware fault.
Solution: If the anomaly occurs frequently, contact the SMA Technical Support Service.

Iac-DC_Offs-Srr
There is a network fault.
Solution: Check network conditions. If the anomaly occurs frequently or several times in a row, contact the SMA Technical Support Service.

IGBTs
The internal hardware control has detected an anomaly in the power electronics.
Solution: Contact the SMA Technical Support Service.

L<->N
Reversal of L and N on the AC connection.
Solution: Check the network connection.

 

  1. ACVtgRPro

    • Description: The average network voltage deviates from the allowed range.
    • Solution: Check the network voltage at the inverter's connection point. If the voltage is consistently high, consult with the network operator about adjusting the feed-in voltage or modifying the "ACVtgRPro" parameter for voltage quality monitoring. If the issue persists, contact SMA Technical Support.

  2. CAN

    • Description: Internal communication fault.
    • Solution: If this anomaly occurs frequently, contact SMA Technical Support.

  3. Derating

    • Description: The inverter is in a "Derating" condition due to various temporary reasons.
    • Solution: Check the inverter's thermal dissipation. The "Derating" warning remains until the device is fully powered off (in the evening).

  4. dI-Bfr / dI-Srr

    • Description: Sudden change in differential current, potentially due to a ground fault or leakage.
    • Solution: Check system insulation and inspect for possible leakage to ground.

  5. EEPROM

    • Description: Error in EEPROM data transmission; may affect operation.
    • Solution: Contact SMA Technical Support if the error continues.

  6. Fac-Bfr / Fac-Srr / FacFast

    • Description: Network frequency deviation from the allowed range, triggering a network disconnection.
    • Solution: Check the network frequency and ensure it's within the tolerable range. If not, contact SMA Technical Support.

  7. HW-Signal

    • Description: Internal measurement or hardware fault.
    • Solution: If frequent, contact SMA Technical Support.

  8. Iac-DC_Offs-Srr

    • Description: Network fault detected on the AC side.
    • Solution: Check network conditions; contact SMA if frequent.

  9. IGBTs

    • Description: Fault detected in the inverter's power electronics.
    • Solution: Contact SMA Technical Support.

  10. L<->N

    • Description: Reversal of L and N on the AC connection.
    • Solution: Check the network connection.

  11. MSD-dI, MSD-Fac, MSD-Vac, MSD-Timeout

    • Description: Internal measurement fault or hardware defect in various areas.
    • Solution: Contact SMA Technical Support if these faults recur.

  12. offset

    • Description: Fault in measurement data acquisition.
    • Solution: If frequent, contact SMA Technical Support.

  13. PowerBalance

    • Description: Issue in three-phase system with SMA Power Balancer.
    • Solution: Consult the manual section on SMA Power Balancer for more details.

  14. REL_INV_CLOSE, REL_GRID_CLOSE, REL_INV_OPEN, REL_GRID_OPEN

    • Description: Grid relay issues; relays are not functioning correctly to safely connect/disconnect from the grid.
    • Solution: Contact SMA Technical Support if recurring.

  15. Riso, Riso-Sense

    • Description: Insulation fault between PV system and ground.
    • Solution: Check system insulation and look for ground faults.

  16. ROM

    • Description: Firmware fault in the inverter.
    • Solution: Contact SMA Technical Support if frequent.

  17. SD-DI-Wandler, SD-Imax, SD-WR-Bruecke

    • Description: Insulation or overcurrent faults detected, with the inverter disconnecting from the grid.
    • Solution: Contact SMA Technical Support if recurring.

  18. STM Timeout

    • Description: Internal program run fault.
    • Solution: Contact SMA Technical Support if frequent.

  19. Vac-Bfr, Vac-Srr

    • Description: Grid voltage on line 2 is outside the permissible range, triggering disconnection.
    • Solution: Check grid voltage and connection. Contact SMA if recurring.

  20. VpvMax, Vpv-Max

    • Description: Overvoltage at the DC input.
    • Solution: Disconnect the inverter immediately. Check system design if the issue persists.

  21. UZWK-Max

    • Description: Overvoltage detected in the inverter’s intermediate circuit.
    • Solution: Contact SMA Technical Support if recurring.

  22. Watchdog / Watchdog-Srr

    • Description: Internal program run fault.
    • Solution: Contact SMA Technical Support if frequent.

Network Disturbances

  1. 101 - 103: Network Disturbance

    • Cause: Voltage or impedance at the inverter's connection point is too high. The inverter has disconnected from the public grid.
    • Solution: Check if the voltage at the connection point consistently stays within the permitted range. If local conditions prevent this, contact the grid operator.

  2. 202 - 203: Network Disturbance

    • Cause: The public grid is disconnected, the AC cable is damaged, or voltage at the inverter’s connection point is too low.
    • Solution: Ensure the circuit breaker is on, the AC cable is undamaged, and properly connected. Verify voltage is within the permitted range.

  3. 301: Network Disturbance (10-Minute Average)

    • Cause: 10-minute average network voltage exceeds the allowed range. The inverter disconnects to preserve voltage quality.
    • Solution: Verify voltage at the connection point and consult the grid operator if necessary.

  4. 401 - 404: Network Disturbance

    • Cause: The inverter is no longer operating in parallel with the grid.
    • Solution: Check for strong, brief fluctuations in network frequency.

  5. 501: Network Disturbance

    • Cause: The grid frequency is outside the allowed range, causing disconnection.
    • Solution: Monitor grid frequency and consult the grid operator if frequent.

  6. 601: Excessive DC Component in Network

    • Cause: The inverter detected an excessive direct current component in the network.
    • Solution: Check DC component in network connection. Contact grid operator if issue persists.

  7. 701: Frequency Out of Range

    • Cause: Network frequency is outside the allowed range.
    • Solution: Monitor grid frequency and consult grid operator if frequent.

  8. 1302: Wait for Grid Voltage - Fuse Check

    • Cause: AC cable not connected correctly or incorrect national data record.
    • Solution: Ensure AC cable is connected correctly and national data is set appropriately.

  9. 1501: Network Reconnection Disturbance

    • Cause: Modified national data record or user-set parameters do not meet local requirements.
    • Solution: Ensure national data record is correctly set. Consult SMA Technical Support if needed.

  10. 3301 - 3303: Unstable Operation

    • Cause: 10-minute average voltage is outside the permitted range.
    • Solution: Verify connection point voltage and consult the grid operator if necessary.

  11. 3401 - 3402: DC Overvoltage - Disconnect Generator

    • Cause: Overvoltage on DC input, which can irreparably damage the inverter.
    • Solution: Immediately disconnect the inverter and verify if DC voltage is within safe limits.

  12. 3501: Insulation Fault - Check Generator

    • Cause: Ground leakage detected in the PV generator.
    • Solution: Check for ground leaks in the PV system.

  13. 3601: High Leakage Current - Check Generator

    • Cause: Excessive leakage current detected, which may indicate a fault or ground leak.
    • Solution: Check for ground leaks in the PV system.

  14. 3701: Ground Fault Current - Check Generator

    • Cause: Ground fault detected in the PV generator.
    • Solution: Check for ground leaks in the PV system.

  15. 3801 - 3802: DC Overcurrent - Check Generator

    • Cause: Overcurrent on DC input, briefly disconnecting the inverter from the grid.
    • Solution: Verify generator design and wiring if recurring.

  16. 3901 - 3902: Wait for DC Start Conditions

    • Cause: Start conditions for feeding into the grid are not met.
    • Solution: Wait for increased sunlight or adjust startup voltage threshold.

String Issues

  1. 4001: String X Fault - Do Not Pull ESS

    • Cause: Reverse current or polarity inversion in a string.
    • Solution: Disconnect inverter at night and check generator design and wiring.

  2. 4002: Low Power in String X

    • Cause: Faulty or weak string detected.
    • Solution: Check the indicated string.

  3. 4003: String X Fault - Do Not Pull ESS

    • Cause: Faulty or weak substring detected.
    • Solution: Disconnect inverter and check generator design and wiring.

  4. 4005: Low Power in Partial String X

    • Cause: Faulty or weak partial string detected.
    • Solution: Check the partial string indicated.

Self-Diagnosis and Internal Errors

  1. 6001 - 6445: Self-Diagnosis - Device Malfunction

    • Solution: Contact SMA Technical Support.

  2. 6313: Device Malfunction

    • Solution: Contact SMA Technical Support.

  3. 6429 - 6439: Device Malfunction

    • Solution: Contact SMA Technical Support.

  4. 6501 - 6502: Self-Diagnosis - Overtemperature

    • Cause: The inverter has disconnected due to high temperature.
    • Solution: Clean cooling fins and ensure proper ventilation.

  5. 6603 - 6604: Self-Diagnosis - Overload

    • Solution: Contact SMA Technical Support.

  6. 6701 - 6702: Communication Defect

    • Solution: Contact SMA Technical Support.

  7. 6801 - 6802: Self-Diagnosis - Input A Fault

    • Solution: Contact SMA Technical Support.

  8. 6901 - 6902: Self-Diagnosis - Input B Fault

    • Solution: Contact SMA Technical Support.

  9. 7001 - 7002: Fan Sensor Error - Permanent On

    • Solution: Contact SMA Technical Support.

  10. 7101: SD Card Fault

    • Cause: The SD card is not formatted.
    • Solution: Reformat SD card and reload files.

  11. 7102: Parameter File Missing/Corrupt

    • Cause: Parameter file missing or corrupted.
    • Solution: Copy parameter file to SD card's PARASET directory.

  12. 7105: Parameter Setting Failed

    • Cause: Parameter setting via SD card failed.
    • Solution: Verify parameter validity and ensure Grid Guard code is entered.

  13. 7106: Update File Corrupt

    • Solution: Reformat SD card and reload files.

  14. 7110: Update File Not Found

    • Solution: Copy update file to SD card’s \UPDATE folder.

  15. 7201 - 7202: Data Storage Fault

    • Solution: Contact SMA Technical Support.

  16. 7303: Central PC Update Failed

    • Solution: Contact SMA Technical Support.

  17. 7305: RS485I Module Update Failed

    • Solution: Try updating again or contact SMA if recurring.

  18. 7307: Bluetooth Update Failed

    • Solution: Try updating again or contact SMA if recurring.

  19. 7309: Display Update Failed

    • Solution: Try updating again or contact SMA if recurring.

  20. 7311: Language Table Update Failed

    • Solution: Try updating again or contact SMA if recurring.

  21. 7314: String Protection Update Failed

    • Solution: Try updating again or contact SMA if recurring.

  22. 7316: Speedwire Module Update Failed

    • Solution: Try updating again or contact SMA if recurring.

  23. 7324: Waiting for Update Conditions

    • Solution: Ensure DC power is sufficient (more than 1000 W for over 1 minute).

  24. 7326: Webconnect Update Failed

    • Solution: Try updating again.

  25. 7401: Varistor Fault

    • Cause: At least one thermally controlled varistor is faulty.
    • Solution: Check varistor operation.

  26. 7508: Fan Error - Clean Fan

    • Cause: A fan is blocked.
    • Solution: Clean the fan.

  27. 7701 - 7703: Self-Diagnosis - Device Malfunction

    • Solution: Contact SMA Technical Support.

  28. 8001: Power Reduction Due to High Temperature

    • Cause: Power output reduced due to high temperature.
    • Solution: Clean fans and ensure proper ventilation.

  29. 8104: Device Malfunction

    • Solution: Contact SMA Technical Support.

  30. 8201: Device Malfunction - Do Not Pull ESS

    • Solution: Disconnect inverter at night and contact SMA Technical Support.

  31. 8202: Mount ESS, Do Not Open Cover

    • Cause: Device or reverse current fault in PV generator.
    • Solution: Securely mount ESS and disconnect inverter at night.

  32. 8203: Device Malfunction - Do Not Pull ESS

    • Solution: Disconnect inverter at night and contact SMA Technical Support.

  33. 8301: Surge Protection Device A Inactive

    • Cause: One or more surge protection devices are faulty.
    • Solution: Check surge protection devices.

  34. 8302: Surge Protection Device B Inactive

    • Cause: One or more surge protection devices are faulty.
    • Solution: Check surge protection devices.

  35. 8401: Overheating - Disconnect from Grid and Generator

    • Solution: Contact SMA Technical Support.

  36. 9002: Invalid GridGuard Code

    • Cause: Incorrect Grid Guard code entered.
    • Solution: Enter correct Grid Guard code.

  37. 9003: Network Parameters Locked

    • Solution: Network parameters are locked but can be modified with rotary switches if needed.

  38. 9005: Modify Network Parameters - Ensure DC Power

    • Cause: Incorrect rotary switch setting for country configuration or insufficient DC voltage.
    • Solution: Ensure correct settings and sufficient DC voltage.

  39. 9007: Autotest Interruption - AC Wiring Error

    • Cause: Incorrect AC wiring.
    • Solution: Ensure AC connection is correct as per the inverter manual.

     

    Models: SUNNY BOY SUNNY MINI CENTRAL SUNNY TRIPOWER
    SB1200 SB1700 SB2500 SB3000 SB3300 SB3800 1200 1700 2500 3000 3300 3800
    SMC5000A SMC6000A SMC7000HV 5000A 6000A 7000HV
    2000HF 2500HF 3000HF
    6000TL 7000TL 8000TL 10000TL 11000TL
    3000TL-20 4000TL-20 5000TL-20 TRP8000TL TRP10000TL TRP12000TL TRP15000TL TRP17000TL
    8000TL 10000TL 12000TL 15000TL 17000TL
    240 6000A-11
    1300TL 1600TL 2100TL 2500TLST-21 3000TLST-21 5000TL-20 6000TL-20 7000TL-20 8000TL-20 9000TL-20 15000TLHE 20000TLHE 15000TLEE 20000TLEE
    3000TL-21 3600TL-21 4000TL-21 5000TL-21
    SB3000TL-20 SB4000TL-20 SB5000TL-20
    SB2000HF SB2500HF SB3000HF
    STP8000TL-10 STP10000TL-10 STP12000TL-10 STP15000TL-10 STP17000TL-10
    STP15000TLTLHE STP20000TLTLHE STP15000TLTLEE STP20000TLTLEE
    STP5000TL-20 STP6000TL-20 STP7000TL-20 STP8000TL-20 STP9000TL-20
    SB3000TL-21 SB3600TL-21 SB4000TL-21 SB5000TL-21
    SB2500TLST-21 SB3000TLST-21
    SC4600UP-US SC4200UP-US 2200 2475
    CENTRAL UP 2200-US 2475-US 2900-US
    Sunny Central 2200 Sunny Central 2475 Sunny Central 2500-EV Sunny Central 2750-EV Sunny Central 3000-EV
    Sunny Island 6048-US Sunny Island 6048-US (120 V / 240 V split-pha
    Sunny Tripower CORE2 Sunny Island 4,4M Sunny Island 6,0H Sunny Island 8,0H
    Sunny Highpower 100-21 Sunny Highpower 150-21 Sunny Highpower 172-21 Sunny Highpower 180-21 Sunny Boy Storage 2,5
    X3-FTH-80K X3-FTH-100K X3-FTH-110K X3-FTH-120K X3-FTH-125K X3-FTH-136K-MV