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Fixing Growatt SPH 10000 TL3 BH-UP Connection Problems

Alex Johnson
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Fixing Growatt SPH 10000 TL3 BH-UP Connection Problems

Troubleshooting Connection Issues with Your Growatt SPH 10000 TL3 BH-UP Inverter

Hello! It seems you're experiencing some connection issues with your Growatt SPH 10000 TL3 BH-UP inverter, and that's exactly what we're going to dive into today. Based on the information you've provided, we'll try to troubleshoot the problem and hopefully get your system communicating properly. Let's start with a breakdown of the issue, then explore some potential solutions.

Understanding the Problem

You've provided some valuable logs and details, which give us a good starting point. Here's what we can gather from your initial messages:

  • Inverter Model: Growatt SPH 10000 TL3 BH-UP
  • Connection Method: You're attempting to connect via TCP using a Modbus interface.
  • Hardware: You're using a USR-TCP232-410S serial to Ethernet adapter.
  • Error Messages: The logs show a recurring "Modbus Error: [Input/Output] No response received after 3 retries." This is a critical error message indicating that the Modbus client (your system) isn't getting any replies from the inverter.
  • Debugging Attempts: You've run the growatt.py script to test the connection, which resulted in a similar "No response received" error.
  • Wiring Concerns: You've correctly identified potential wiring discrepancies related to the RS485 communication of the inverter.

It appears that the primary problem is a failure of the Modbus communication. The inverter isn't responding to your connection attempts. To address this, we need to methodically check all potential causes, from the physical wiring to the software configuration.

Step-by-Step Troubleshooting Guide

Let's go through the steps you can take to identify and resolve the issue. Be sure to perform each step carefully, documenting your findings, as this will help narrow down the problem.

  1. Physical Connections and Wiring

    • Verify RS485 Wiring: This is crucial! You've already identified potential wiring issues, which is a great start. Double-check and triple-check the wiring between your inverter and the USR-TCP232-410S adapter. Based on your comments, the correct wiring should be as follows, this is really important:

      • Inverter (RS485 B) <--> Adapter (Pin 1)
      • Inverter (RS485 A) <--> Adapter (Pin 5)
      • Inverter (GND) <--> Adapter (Pin 2) Make sure these connections are secure and that the wires are properly inserted into the terminals. Loose connections are a frequent source of these types of issues.

    • Power Cycling: Sometimes, a simple power cycle can resolve communication problems. Turn off the AC and DC breakers to your inverter, wait a few minutes, then turn them back on. Also, power cycle your USR-TCP232-410S adapter.

  2. Network and Adapter Configuration

    • IP Address and Port: Ensure the USR-TCP232-410S adapter has a valid IP address on your network and that it's correctly configured to forward Modbus TCP traffic to the inverter. It should be on the same network as your computer or Home Assistant instance. Double-check your settings to confirm the correct settings with your inverter.

    • Port 502: Modbus TCP typically uses port 502. Ensure your adapter is configured to use this port and that there are no firewall rules blocking traffic on this port.

    • Network Connectivity: Ping the IP address of your USR-TCP232-410S adapter from your computer to confirm network connectivity. If you can't ping the adapter, there's a network issue that must be addressed first.

  3. Modbus TCP Configuration and Software

    • Slave ID: The Growatt inverter's Modbus slave ID must be correctly configured in your software (Home Assistant, or the growatt.py script). The default slave ID is typically 1 or 2, but you should verify this in your inverter's settings or manual.

    • Register Map: The register map used in your software is critical. You've confirmed that you're using the SPH-3000-10000 register map. Double-check to ensure this is indeed the correct map for your SPH 10000 TL3 BH-UP inverter model.

    • Software Configuration: Verify that your software (Home Assistant with the Growatt Modbus integration, or your Python script) is configured correctly:

      • IP Address: The IP address of the USR-TCP232-410S adapter.
      • Port: Port 502.
      • Slave ID: The correct slave ID of your inverter.
      • Register Map: The correct register map for your inverter.

    • Debugging Script: You've already used the growatt.py script. When you run this, use the correct IP address, port, and slave ID, as per your inverter’s configuration.

  4. Inverter Settings

    • Modbus Enable: Very Important! Make sure that Modbus TCP is enabled within the inverter's settings. If Modbus is disabled, the inverter won't respond to any communication attempts.

    • Baud Rate (If applicable): While you're using Modbus TCP, some inverters might have settings that affect the communication, although most TCP implementations will not involve baud rate settings. If your inverter has RS485 communication, it might influence the setting.

  5. Alternative RS485 Adapters

    • Testing New Adapters: You've mentioned you plan to try other RS485 to Ethernet/USB adapters, which is a good troubleshooting step. If the problem persists with multiple adapters, the issue is more likely with the inverter itself or your network configuration, not the adapter.

Further Troubleshooting Steps and Considerations

  1. Check the Inverter's Manual: Consult your Growatt SPH 10000 TL3 BH-UP inverter's manual for specific Modbus configuration instructions and troubleshooting tips. The manual is an invaluable resource.

  2. Firmware Updates: Check if there are any available firmware updates for your inverter. Outdated firmware can sometimes cause communication problems.

  3. Check the inverter's display: See what the inverter is displaying. It may be displaying an error, such as a communication error.

  4. Use a Modbus Scanner: A Modbus scanner can help you to determine if the issue is with your client software, the network, or the inverter. There are many Modbus scanners available online.

  5. Check the distance of the RS485 cable: If the distance is too long, the signal might be too weak. If the distance is long, try using a shielded cable or a repeater.

Analyzing the Log Files

Let's take a closer look at the error messages in the logs again:

  • Modbus Error: [Input/Output] No response received after 3 retries: This error indicates that the Modbus client (your software) is not receiving a response from the Modbus server (the inverter). The client is sending a request but not getting a reply.

  • Failed to read base input register block: This means the software is unable to read the data, which is most likely because of the Modbus error.

  • Disconnected from Growatt inverter: Your software is intentionally disconnecting after the Modbus connection fails.

Summary

Your issue appears to be related to communication problems between your inverter and the software you are using. The solution will involve careful troubleshooting, starting with the wiring and network configuration and then progressing through the software settings and the inverter settings.

By following these steps, you should be able to identify the root cause and get your Growatt inverter communicating properly. Good luck, and don't hesitate to ask if you have any further questions.

External Resources

For more detailed information, consider visiting the following resource:

  • Growatt's Official Website: https://www.growatt.com/ - For manuals, support, and technical information on your inverter.

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