This guide describes step by step how to connect a SAJ HS3 battery system to the Currentt Navigator via Modbus TCP over the local network (Ethernet).
See also: For connection via RS-485 (Modbus RTU), see the guide SAJ HS3 Modbus RTU.
✅ Compatible models
Single-phase (HS3-S2 series)
| Model | Power |
|---|
| HS3-3K–6K-S2 | 3 – 6 kW |
Three-phase (HS3-T2 series)
| Model | Power |
|---|
| HS3-3K–12K-T2 | 3 – 12 kW |
🧰 Requirements
- Currentt Navigator (connected to the local network)
- Ethernet cable (RJ45, CAT5/Cat6)
1️⃣ Step 1: Connect Ethernet cable
- Connect an Ethernet cable (RJ45) to the Ethernet port on the HS3
- Connect the other end to your network switch or router
- The HS3 automatically obtains an IP address via DHCP
2️⃣ Step 2: Check network settings
Check the network settings via the LCD display on the HS3 or via the eSolar app.
- Navigate on the display to System Settings > Network Settings
- Check the following settings:
| Setting | Value |
|---|
| DHCP | Enabled (recommended) |
| IP address | (automatically assigned via DHCP) |
- Note the IP address assigned to the HS3
3️⃣ Step 3: Configuration in the Currentt Navigator
After connecting the HS3 to the network, the system must be added in the Currentt Navigator.
Via the Setup Wizard (recommended)
- Click the settings icon (top right of the screen)
- Choose Setup Wizard
- Follow the on-screen steps
Manual configuration
- Click the settings icon (top right of the screen)
- Go to Components
- Click the + button in the Batteries section
- Select SAJ
- Enter the connection details:
| Parameter | Value |
|---|
| Connection | Modbus TCP |
| IP address | (IP address of the HS3) |
| Port | 502 |
| Modbus address | 1 (default) |
📋 Settings summary
| Parameter | Value |
|---|
| Connection | Ethernet (Modbus TCP) |
| Protocol | Modbus TCP |
| IP address | (dynamic or static) |
| Port | 502 |
| Modbus address | 1 (default) |
🛟 Troubleshooting
| Problem | Possible cause | Solution |
|---|
| No connection | Wrong IP address | Check the IP address via the HS3 display or the router |
| No connection | Wrong port | Check that the TCP port is set to 502 |
| No connection | HS3 not on the network | Check that the Ethernet cable is connected and the HS3 has an IP address |
| No connection | Devices on different network | Ensure the Currentt Navigator and the HS3 are on the same (V)LAN |
| No connection after restart | IP address changed (DHCP) | Set a static IP address |
| No communication | System in sleep mode | The system may not communicate when there is no PV production (depending on firmware) |