How to connect Huawei SUN2000 (Smart Dongle WLAN-FE / 4G) with Reduxi controller
Set up the Huawei Smart Dongle on a SUN2000 inverter: local connection, internet access and available functions.
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Product photo of the Huawei Smart Dongle on a white background: a black, elongated plastic device with a cable gland at the top and another at the bottom. The HUAWEI logo with the petal symbol is printed faintly on the upper front. A small round green LED is in the middle of the front, and a rounded label area is below it.
1 Physical setup
1.1 Required equipment
- Huawei SUN2000 inverter
- Huawei Smart Dongle (WLAN FE or 4G)
- Mobile device with Wi‑Fi and the FusionSolar app
- Home Wi‑Fi password (for a Wi‑Fi connection) or SIM card and APN from the mobile network operator (for 4G)
1.2 Install the dongle
Text description of this image
Product photo of a black plastic dongle on a white background, standing upright with a round black threaded cap at the top and a black cable gland at the bottom. The front shows the 'HUAWEI' logo with its petal symbol, a small rectangular recess below it, a lit green round LED, and an embossed rounded label 'FRONT' in the lower part.
Text description of this image
Small product photo of a black plastic dongle on a white background, standing upright with a round black threaded cap at the top. The front shows the 'HUAWEI' logo with its petal symbol, a small embossed rounded label below it and a lit green round LED in the lower part.
2 Local connection to the dongle (Wi‑Fi method)
2.1 Connect to the dongle network
On your mobile device, open the Wi‑Fi settings and connect to one of these networks:
SUN2000-XXXXDongle-XXXX
The password is on the dongle sticker or on the inverter label.
2.2 Access through the app
2.3 Log in
Default login credentials:
- Username:
installer - Password: printed on the device label
3 Initial configuration
3.1 Set up internet access
In the FusionSolar app, choose the method of external communication: Settings – Communication configuration – Router connection settings.
Text description of this image
Three phone screens of the FusionSolar app side by side. Screen 1 (device page): title 'SUN2000-10KTL-M0', status 'OFF : unexpected shutdown' in red; two status tiles with red alert badges: 'Communication status: WLAN Connection failed' and 'Management system: Connection failed'; values: Active power 0.000 kW, Energy yield of current day 0.00 kWh, Monthly Energy Yield 0.00 kWh, Total 0.50 kWh; tiles: Alarm management (red badge), Quick settings, Device Monitoring, Maintenance, Settings (red box), Power adjustment. Screen 2 'Settings': Grid parameters; Protection parameters; Feature parameters; Power adjustment; Time setting; Communication configuration (red box). Screen 3 'Communication configuration': Inverter WLAN settings; Dongle parameter settings; Router connection settings (red box); RS485 settings; Management System Configuration; a loading spinner below the list.
3.2 Option A: connect via home Wi‑Fi
3.3 Option B: connect via 4G (SIM)
3.4 Confirm the internet connection
The communication status must show:
- Online
- A visible signal strength
4 Alternative access via web browser
Use a web browser instead of the FusionSolar app:
http://192.168.200.1
5 Available functions after connection
After you connect to the inverter through the dongle interface, these functions are available.
5.1 System monitoring
- Real‑time power output (kW)
- Daily, monthly and annual production (kWh)
- Historical trends and graphs
5.2 System status overview
- Inverter operating status
- Faults and alarms
- Warning messages
5.3 Performance optimization
- Detection of underperforming panels
- Identification of shading or module faults
5.4 Advanced configuration
Some parameters need installer access.
- Grid settings
- Export power limitation
- Battery parameters (if applicable)
5.5 Battery management (if installed)
- Charge and discharge monitoring
- Operating modes: self‑consumption, backup, time‑of‑use
5.6 Remote monitoring
When the system is online, it is visible in the FusionSolar Cloud. This gives you:
- Remote access from anywhere
- Push notifications in case of faults
6 Security recommendations
- Change the default password after the first login.
- Do not share the installer credentials.
- Keep the inverter and dongle firmware up to date.
✓ Summary
Preparation (Point 1): Switch on the inverter, insert the dongle into the USB/COM port and wait 1–2 minutes.
Local connection (Points 2 and 4): Connect to the dongle Wi‑Fi and log in as installer in the FusionSolar app or at 192.168.200.1.
Internet access (Point 3): Connect the dongle to home Wi‑Fi or to 4G with the APN. The status must show Online.
Use and secure (Points 5–6): Use monitoring, configuration and the FusionSolar Cloud. Change the default password.
→ Common issues
| Issue | Solution |
|---|---|
| Dongle Wi‑Fi network not visible | Reinsert the dongle. Restart the inverter. Wait 2–3 minutes. |
| Login failed | Verify the password on the device label. Try the default installer credentials. |
| No internet connection | Check the Wi‑Fi password, the signal strength and, for 4G, the APN. |
| App cannot connect | Disable mobile data while your device is connected to the dongle Wi‑Fi. |