BYD | Battery–Inverter Communication | No Charging or Discharging

Correct configuration
Check that the system configuration is correct. The latest “BYD Battery-Box Premium HVS & HVM Compatible Inverter List” is available from www.eft-systems.de or www.bydbatterybox.com. Make sure the inverter is configured correctly.

App configuration and firmware
Check that the app configuration was completed successfully and that the battery has the latest firmware.

Check DIP switches
If one or two towers are used, all DIP switches should normally be in the LEFT position, except for configurations such as Kostal PIKO MP plus.

If three towers are connected in parallel, refer to the manual for the correct DIP-switch configuration.

Communication
Check whether the inverter detects the battery correctly and displays parameters such as SOC and battery temperature. If not, check the wiring:

• Confirm the correct pin/cable configuration for the inverter model.
• Replace the communication cable if necessary; minimum CAT5, preferably CAT7 according to the source guidance.
• For SMA and Fronius, check the enable signal required for battery activation.

Depending on the inverter model, one or two of the available communication-connection options may be used. Follow the relevant manual and try the alternative supported connection option if one is available.

Earthing
Connect the battery directly to the building's earthing bar. Do not earth it indirectly via the inverter housing or other devices. Correct battery earthing is important for reliable data communication.

BCU relay closed / output voltage present?
Once communication between battery and inverter has been established, the BCU should close its relay. Only then is output voltage present. Check the output voltage either using the Be Connect app / Be Connect Plus tool or by checking whether the inverter displays the battery voltage correctly.

Restart the complete system in the defined sequence

1. Switch off the battery by holding the power button for 5 seconds.
2. Switch off the inverter DC switch.
3. Switch off the inverter AC circuit breaker.
4. Kostal only: disconnect the PV strings from the inverter.
5. Wait 10 minutes.
6. Switch on the battery by moving the breaker lever up.
7. Kostal only: reconnect the PV strings to the inverter.
8. Switch on the inverter AC circuit breaker.
9. Switch on the inverter DC switch.

If the battery does not switch off after the LED button has been held for 5 seconds and the LED remains on, remove/lift the BCU to prevent further discharge and contact service.

BYD | State of Charge (SOC) & Charge Control

Initial SOC during commissioning
New HVS/HVM modules are delivered with a state of charge of approximately 30%. When a new battery system is commissioned, the BCU often initially displays an incorrect SOC, commonly 50%, 30% or 0%. This should be understood as a placeholder value because the BCU does not yet know the actual state of charge of the modules. As soon as the battery begins charging, SOC detection is corrected step by step. The SOC calibration is completed at the latest after a full cycle: charging to 100% followed by discharging to the permitted maximum depth of discharge.

SOC jumps
The state of charge of an LFP battery is not measured directly; it is calculated. Battery voltage is an important factor, but temperature, current flow and charging behaviour also influence the calculation. SOC estimation is generally more accurate when the battery regularly completes full cycles. The displayed SOC is therefore an approximation and can differ by several percentage points from the actual value. Occasional corrections or jumps in the displayed SOC are normal.

BYD | Unexpected Shutdown

The system was commissioned successfully and operated for some time, but later shut down unexpectedly.

Communication with the inverter
The battery operates only with a compatible external inverter. If communication between battery and inverter is interrupted for any reason, the battery switches itself off within approximately 30 minutes. Check which device switched off first, battery or inverter, and whether the inverter is detecting the battery correctly, for example whether SOC and battery temperature are displayed correctly.

Battery log data / historical data
Intermittent faults can be difficult to identify because they occur only occasionally. Download and provide all available historical battery logs so the cause can be analysed.

Inverter messages / inverter portal data
Unexpected shutdown can also be caused by general system settings. The inverter data therefore needs to be evaluated as well.

• Check which error messages are shown in the inverter or portal.
• Where required for the service process, share access to the inverter portal by adding info@eft-systems.de and provide the system name used in the portal.

BYD | BCU LED Event Codes (EC) | 100–112

A continuously white LED indicates standby. A flashing white LED indicates charging or discharging. When the battery starts, the LED flashes white and blue at 0.5-second intervals, normally for about one minute during startup. If the LED flashes blue at 1-second intervals, it is displaying an event code. Start counting when the white LED begins to flash, then count the blue flashes.
Examples:
1x white, 3x blue → EC 103
1x white, 11x blue → EC 111
3x white, 3x blue → EC 303
Many faults are caused by an incorrect communication connection, incorrect app configuration or a missing restart after configuration with the app or BCP tool.

Note: If the battery has not been configured correctly in the app, the event code can be misleading.

EC 102
Abnormal shutdown/open cover, pre-charge fault or reversed DC polarity.

• Check the DC cable connection between battery, inverter and any DC busbar in between.
• Close the BCU connection-area cover correctly. For safety reasons the battery cannot be switched on while this area is open.
• Try to shut down the BCU correctly by holding the button for 5 seconds.
• If the LED goes out, check the installation and restart the system correctly: battery first, then inverter.
• If the LED remains continuously blue or continues flashing EC 102, remove the BCU from the tower to avoid deep discharge, measure the voltage and contact a service partner.

EC 103
Voltage-sensor fault / BMU-to-BMS communication fault.

• Make sure all DIP switches are in the correct position. For most configurations they are all on the left; exceptions include certain parallel configurations and Kostal PIKO MP.
• Remove the top module and check whether the event code disappears.

Note: A module with communication problems can sometimes work normally in the lowest position because no communication to the base is required there.

EC 104
Temperature-sensor fault.

• Use the BCP PC tool to review module cell data under “Diagnosis” and identify the affected module, or use the module-exclusion method.

EC 105
Pack-voltage sensor fault.

• Check the DC cable connection at the battery, inverter and any DC busbar.
• Restart the system correctly.

EC 106
Current-sensor fault.

• Make sure the latest firmware is installed and restart the battery correctly.

EC 107
Undervoltage.

• Shut the system down promptly to avoid further discharge. Check whether it can be shut down normally by holding the LED button for 5 seconds.
• If it cannot be shut down normally, lift/remove the BCU from the tower.

EC 108
Pre-charge circuit fault.

• Check the DC cable connection at the battery, inverter and any busbar in between.
• Restart the system correctly. To switch the battery off correctly, hold the button for 5 seconds. When switching on, start the battery first and then the inverter.

EC 109

• Make sure the latest firmware is installed and restart the battery correctly. If the problem remains, a module is likely to be the cause.

EC 110
Low voltage. The system must be charged very soon and should not be discharged further.

1. Shut the system down quickly to avoid further discharge. Check whether it shuts down normally by holding the LED button for 5 seconds. If not, lift/remove the BCU. Follow the service-guide procedure for voltage measurement and undervoltage.
2. Keep the battery switched off or the BCU removed while locating the cause. Check the other service-guide steps and the inverter, including firmware and defined restart procedure. Determine why maintenance charging is not taking place, for example because of an inverter or sensor fault. Do not switch the battery back on until it has been confirmed that the inverter should be able to charge it.
3. If all checks have been completed and the system still cannot charge, prevent further discharge and contact service.

EC 111
This can be normal immediately after the battery has been started. The LED should become continuously white when inverter communication is established or directly after the configuration has been completed and saved. In Be Connect, complete the entire wizard. In Be Connect Plus, save the configuration again via “Setup” and restart the tool if necessary to refresh the display. Also make sure all DIP switches are in the correct position. If EC 111 remains despite correct inverter communication and a newly saved configuration, remove the top module and check whether the event code disappears.

EC 112
No communication with the inverter.

• Check communication between the battery and inverter.

BYD | BCU LED Event Codes (EC) | 203–803

A continuously white LED indicates standby. A flashing white LED indicates charging or discharging. When the battery starts, the LED flashes white and blue at 0.5-second intervals, normally for about one minute during startup. If the LED flashes blue at 1-second intervals, it is displaying an event code. Start counting when the white LED begins to flash, then count the blue flashes.
Examples:
1x white, 3x blue → EC 103
1x white, 11x blue → EC 111
3x white, 3x blue → EC 303
Many faults are caused by an incorrect communication connection, incorrect app configuration or a missing restart after configuration with the app or BCP tool.

EC 203 | EC 303 | EC 403 | EC 503 | EC 603 | EC 703 | EC 803
Incorrect number of modules / module not detected.

• Make sure the app configuration has been completed correctly, especially the number of modules and the module type (HVS/HVM).
• EC 203 through EC 803 indicate that a module is not being detected. The first digit, represented by the number of white flashes, indicates the affected module position. The affected module or the module directly above it can be responsible. Example: EC 103 refers to the top module; EC 403 refers to the fourth module from the top.
• Remove the affected module and check whether the event code disappears. If not, check the module above it.
• Rearrange the modules in the tower and test again.

Note: A module with a communication problem can sometimes operate without restriction in the lowest module position because no communication to the base is required from that position.

MOD XH BP Inverter Error Guide | Errors 200–299

Error 200 – AFCI fault

1. After shutting down the inverter, check the PV panel/string terminal.
2. Restart the inverter.

Error 201 – Leakage current too high

1. Restart the inverter.

Error 202 – DC input voltage exceeds the maximum permitted value

1. Disconnect the DC switch immediately and check the voltage.

Error 203 – Low PV insulation

1. After switching off the inverter, check that the PV module/frame earthing is correct.

MOD XH BP Inverter Error Guide | Errors 300–399

Error 300 – AC voltage out of range

1. Check the grid voltage.

Error 301 – AC terminals reversed

1. Check the AC terminals.

Error 302 – No AC connection

1. After shutting down the inverter, check the AC wiring.

Error 303 – N/E abnormal

1. Check the protective-earth connection and make sure the PE conductor has reliable contact.

Error 304 – AC frequency out of range

1. Restart the inverter.

Error 305 – Overload fault

1. Check whether the output load exceeds the permitted range. If the load is too high, reduce it.

Error 306 – CT L/N reversed

1. After switching off the inverter, check the SP-CT connection.

Error 307 – Communication fault, M3 has not received SP-CT

1. Check the communication cable.

MOD XH BP Inverter Error Guide | Errors 400–499

Error 400 – DC overload

1. Restart the inverter.

Error 401 – DC high-voltage fault

1. Restart the inverter.

Error 402 – Current too high

1. Restart the inverter.

Error 403 – Unbalanced output current

1. After shutting down the inverter, check whether the output current is unbalanced.

Error 404 – Bus sampling fault

1. Restart the inverter.

Error 405 – Relay fault

1. Restart the inverter.

Error 406 – Initialisation fault

1. Restart the inverter.

Error 407 – Self-test fault

1. Restart the inverter.

Error 408 – NTC temperature too high

1. After shutting down, check the temperature and restart the inverter once conditions are normal.

Error 409 – Invalid bus voltage

1. Restart the inverter.

Error 410 – Main-board and control-panel supply voltages inconsistent

1. Restart the inverter.

Error 411 – Communication fault

1. After switching off the inverter, check the communication-board wiring.

Error 412 – Temperature-sensor connection incorrect

1. After switching off the inverter, check whether the temperature-measurement module is connected correctly.

GoodWe | Installer Training Module 3 | Troubleshooting & Service

Installer Training
Module 3

Troubleshooting and Service

Open the training material

GoodWe | Inverter Firmware Upgrade via Bluetooth Dongle

GoodWe inverter firmware upgrade via Bluetooth dongle

This manual is suitable for both hybrid and string inverters. See page 7 for battery inverters.

Open the manual

My Device Is Not Working Properly – What Happens Next?

We are sorry that you are experiencing a problem with the product you ordered.

To provide support as quickly and efficiently as possible, the manufacturer needs some information.

The more clearly you describe and document the problem, the faster the manufacturer can assess your case and decide on the correct next step.

The list below is an example and may not apply to every device.

IMPORTANT: Please do not dismantle the device at this stage and do not send it to us or the manufacturer until the manufacturer has approved the return.

• Serial number: Provide it in writing or send a clear photo of the label showing the model and S/N.

• Measurements and parameter settings: Provide the measured current and voltage of each string. Alternatively, record a video of the inverter display showing all relevant system values by scrolling through each screen.

• Parameter settings: As above. Send the video via WeTransfer, Dropbox or a similar service.

• Fault description:
  a) What happened?

  b) Detailed description of the device status
  Describe the actions taken and the final result, for example: battery fully charged, inverter switched on, inverter display lights up, unit beeps for a few seconds and the display switches off. If necessary, please also make a video.

• System description:
  Describe the battery, PV connection, protection devices, earthing and connections. Include the battery model and configuration, PV connection details (panel type, number of strings and panels per string), DC and AC disconnect switches and surge protection, whether the system is earthed and how everything is wired together. If possible, provide a detailed single-line diagram and data sheets.

Thank you for your assistance. Once all information has been received, a service ticket will be opened with the manufacturer as quickly as possible. You will be contacted as soon as the manufacturer responds.

My Inverter Is Faulty and Out of Warranty. Can You Help?

You can order an inverter repair through the website, provided the inverter has not been completely destroyed by lightning or a similar event and no previous repair attempt has been made.

Here is the link: https://www.inutec-int.com/wechselrichter-reparatur-service

You will also find all further information on this page.

How Do I Return Goods to inutec solarcenter?

A withdrawal must generally be declared in writing. Please send an email to kontakt@inutec-int.com. You will then receive all further information regarding the return. Please note that simply returning the goods does not in itself constitute a valid declaration of withdrawal.