Sungrow - Activate Modbus TCP

Connection Options

Option 1: Direct Ethernet Connection (Recommended)

This is the standard and best option for full functionality:

• Connect an Ethernet cable from your inverter's internal LAN port to your home router
• Modbus TCP is typically enabled by default on this port
• Set a fixed IP address in your router for reliable connection
• Provides complete functionality including control features

Option 2: WiNet-S Connection (Basic Functionality)

If you only need to read data:

• Use your existing WiNet-S dongle that's already connected to iSolarFusion
• Limited to read-only functionality
• Sometimes requires manual Modbus activation (follow guide below)

If Modbus needs to be activated on your WiNet-S, follow these steps:

Finding Your WiNet-S Device

Option 1: Through Your Router (Easiest)

1. Log into your router
2. Look for a device named "espressif" in the connected devices list
3. Note down its IP address (it will look like 192.168.1.221)

Option 2: Through the iSolarFusion App

1. Open the iSolarFusion app on your phone
2. Tap the "Support" tab at the bottom
3. Tap "Local Access"
4. Follow the app's instructions to:
   • Scan the QR code on your WiNet-S dongle
   • Press the dongle button three times
   • Connect to the WiNet-S WiFi network

Accessing the WiNet-S Settings

1. Open your web browser (Chrome, Safari, etc.)
2. Type the IP address you found in the address bar
   • Example: http://192.168.1.221
   • Or: if you're at the phone standing just by your inverter (local access) the IP is http://11.11.11.1 but using a laptop/computer is recommended.
3. You'll see the WiNet-S login screen
4. Enter these login details:
   • Username: admin
   • Password: pw8888

Enabling Modbus TCP

1. After logging in, find and click "System" in the menu
2. Click "Transfer Configuration"
3. Look for the Modbus TCP settings
4. Switch on "Local Port" if it's not already enabled
5. Click "Save" or "Apply" (if available)

That's it! Your Modbus TCP is now enabled.

Testing Connectivity

Even though Modbus TCP sometimes comes enabled by default on Sungrow inverters, it's still important to verify that the connection is working properly. You can follow our testing guide to confirm the connection. For Sungrow inverters, use the default Modbus port 502. The Unit ID is typically set to 1. Testing the connection can help ensure that your network configuration is correct and that the inverter is properly accessible.

Common Problems and Solutions

Can't Find the IP Address?

• Make sure your WiNet-S is properly inserted
• Check if your phone/computer is connected to your home network
• Try restarting your router

Login Not Working?

• Double-check you're using: admin / pw8888
• Make sure you're typing the password exactly as shown
• If still not working, contact your installer

Can't Access the Web Page?

• Verify you're connected to your home network
• Try typing "http://" before the IP address
• Try a different web browser

Need More Help?

If you're stuck:

1. Contact your installer
2. Have them enable Modbus access if needed
3. Keep note of any error messages you see

Extra Tips

• The default login (admin/pw8888) is set by Sungrow. The user login is user/pw1111 but doesn't give modbus access.
• Don't change any other settings unless you're sure
• Save any changes you make
• If something goes wrong, your installer can help reset everything