The Sourceful Zap supports two connection methods for Solis inverters: Modbus TCP (via Wi-Fi dongle and network) and Modbus RTU (via RS485 direct wiring).
Compatible Models
S6-EH3P(5-10)K-H-EU
Modbus TCP (via Wi-Fi Dongle)
Before You Begin
This guide covers connection via the inverter's Wi-Fi dongle over your home network. The dongle can only maintain one network connection at a time. When your Sourceful ZAP gateway connects to the inverter, the connection to Solis Cloud will be interrupted.
The Solis mobile app will not receive data while the ZAP is connected
Use the Sourceful Energy app to monitor your system instead
This is expected behavior and not a fault with your setup.
Requirements
Solis hybrid inverter with Wi-Fi dongle installed
Sourceful ZAP gateway
Both devices connected to the same home network
Step 1: Find Your Inverter's IP Address
Your inverter receives an IP address from your router. To find it:
Open your router's admin interface (often at 192.168.1.1) or use your router's mobile app
Look for a device named "Solis" or similar in the list of connected devices
Note down the IP address (e.g., 192.168.1.45)
Step 2: Set a Static IP Address
This step is essential. Without a static IP, your router may assign a new address to the inverter after a restart, causing the ZAP to lose its connection.
Open your router's admin interface or mobile app
Find the DHCP or IP reservation settings
Locate your Solis inverter and reserve its current IP address
Most modern routers make this easy through their companion app. Consult your router's documentation if needed.
Step 3: Add the Inverter in the Sourceful Energy App
Open the Sourceful Energy app
Select Add new energy device
Choose Inverter, then select Solis
Enter the static IP address you configured
Continue to complete the setup
Connection Details
Your ZAP uses these default Modbus TCP settings to communicate with the inverter:
Protocol: TCP
Port: 502
Unit ID: 1
To verify your Modbus TCP connection is working, see How do I know if Modbus TCP is activated on my inverter?
Modbus RTU (via RS485)
Prerequisites
Sourceful Zap
CAT6 FTP ethernet cable (one end will be stripped)
Wiring
Zap Side
Strip one end of the ethernet cable. Use the green pair:
Pin 5 (green/white) =
485APin 4 (green) =
485B
Connect green/white (485A) to the Zap A+ terminal
Connect green (485B) to the Zap B- terminal
Inverter Side
Plug the RJ45 end into the port labeled RS485 on the bottom of the inverter.
Do not use the BMS, Meter, or DO/DI ports.
Troubleshooting
Modbus TCP
Connection Problems
If the ZAP cannot connect to your inverter:
Confirm the inverter is powered on
Verify both devices are on the same network
Ensure no other devices are using the Modbus TCP connection
Check that port 502 is not blocked by your router
Solis App Shows No Data
This is normal when the ZAP is connected. Use the Sourceful Energy app to monitor your system.
If you temporarily need the Solis app, disconnect the ZAP from the inverter in the Sourceful Energy app settings.
Modbus RTU
If RS485 communication is not working:
Verify the cable is in the RS485 port, not the Meter or BMS port
Ensure all cable connections are firmly seated