How to connect Huawei SUN2000 (SDongleA-05) with Reduxi controller
Tested firmware combinations of Huawei SUN2000 inverters with the SDongleA-05 dongle.
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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 Technical documentation
The SDongleA-05 is the Huawei Smart Dongle (AP+STA) that connects a SUN2000 inverter to the network. It connects to the inverter through USB. The Huawei specification page lists it with an Ethernet interface (10/100 Mbps) and Wi‑Fi (802.11 b/g/n), and with up to 10 devices and 10 inverters.
Manufacturer documents:
- Huawei documentation EDOC1100387520 – document on the Huawei support site (web)
- Huawei Smart Dongle-WLAN-FE – specifications (web, EN)
- How to connect Huawei SUN2000 (Smart Dongle WLAN-FE / 4G) with Reduxi controller – Reduxi guide: set up the dongle and its internet access
2 Tested firmware combinations
These inverter and dongle firmware combinations were tested. The last column shows whether the battery charging was limited by the PV output.
| Inverter FW | Dongle FW | Serial Number Inverter | Serial Number Dongle | Battery charging |
|---|---|---|---|---|
| V200R023C10SPC208 | V200R022C10SPC118 | NS2461328500 | TA2490184907 | Charging limited by PV output |
| V100R001C00SPC168 | V200R022C10SPC118 | HV2330962672 | TA2490184839 | Charging limited by PV output |
| V200R023C10SPC208 | V200R022C10SPC201 | NS2461148875 | NS2481544355 | Charging limited by PV output |
| V200R023C10SPC209 | V200R022C10SPC210 | NS2461328429 | TA2490184743 | Charging NOT limited by PV output -> OK! |
3 Log in to the Reduxi web interface
You can open the Reduxi web interface in two ways:
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Screenshot of three Reduxi mobile app screens side by side, with cyan boxes and number badges 2 to 4. Left screen (dashboard, dark theme): menu icon at top left marked with a box and badge 2; 'reduxi' logo; tabs 'Real time data' (active) and 'Statistics'; price 5.79 € and temperature 3.2 °C; energy flow diagram with a house in the centre (-1.25 kW) and icons with values 69.0 W, 1.3 kW, 1.1 kW (red ring), -165.0 W with 97 % (red ring) and 0.0 W values at the bottom; tabs 'Power' and 'Energy'; bottom navigation: Dashboard, Diagnostics, Device control, Settings. Middle screen (side menu): 'reduxi' logo, 'Number of locations: 1233', heading 'Reduxi device management', entries '+ Add Reduxi location' and 'Reduxi devices' (marked with a box and badge 3), then 'My profile' and 'About app'. Right screen (device page): Back; picture of a black Reduxi controller with two Ethernet ports; status 'Connected'; card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'; card 'Connect to configurator': 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' with button 'Activate tunnel connection' (marked with a box and badge 4); card 'Unit details' with field 'Unit ID'.
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Screenshot made of two parts side by side. Left part: Reduxi mobile app screen on a dark background. Top: Back button; picture of a black Reduxi controller with two Ethernet ports and a terminal block; status 'Connected' with a Wi-Fi icon. Card 'Update available': 'New update is available for your Reduxi device.' with button 'Download and install update'. Card 'Connect to configurator' with a key icon: 'Tunnel connection enables remote access to your Reduxi configurator, without need to be connected to the same local network.' and button 'Open configurator', marked with a cyan box and number badge 5. Below: card 'Unit details' with a field 'Unit ID' (value not visible). Right part: Reduxi Configurator opened in a browser, marked with a cyan frame and number badge 6. Header: back arrow, 'Tunnel connection', reload icon. Left sidebar with icons (lightning, chip, lightning bolt, bar chart, gear). Page 'Home' with a green link icon. Green notice: 'New patch available. Click here to apply.' with a close X. Time 09:12:56. Energy flow diagram with a house in the centre (1.700 kW) and icons for grid (0.000 kW), solar (1.700 kW), battery (green, 0.000 kW and 0.800 kW), a device at left (0.900 kW), electric vehicle and a charger or device at bottom. Label 'Energy manager' at the bottom.
http://reduxi.local. You can find the controller's IP address in your router's device list or in the Reduxi app under Reduxi devices.admin · Password: admin (factory default)Text description of this image
Screenshot of the Reduxi Configurator login page in a Chrome browser window. The address bar shows 'Not secure' and 'reduxi.local'; the address bar is marked with a cyan box and an enlarged copy of it (cyan box, text 'Not secure reduxi.local') is shown at the left, connected by a cyan line. Page background: light grey line drawing of a house with solar panels (green), a wall box, an inverter, a car and a charger. Top left: 'reduxi configurator' logo. Login box in the centre with title 'Login', a language selector (English flag, 'English'), a username field and a password field, and a dark 'Login' button.
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Screenshot of the Reduxi Configurator web interface after login, light theme. Top left: 'reduxi configurator' logo. Header bar: 'Home' at left, green 'Connected' status at top right. Left sidebar: expanded section 'Devices' with a list of entries, then collapsed sections 'Manager' and 'Configuration' and 'Settings'. Main area: energy flow diagram. House in the centre with ring, value 24.20 kW. Grid icon at top left, 24.20 kW (red dot on its line). Solar icon at top right, value '-'. Left icon (battery or device), 6.700 kW (green dot on its line). Right icons (battery storage and a device), values '-'. EV charger icon at bottom left, 31.00 kW. A further device icon at bottom right. Label 'Energy manager' below the house.
4 Add the device to Reduxi
Open the Configurator first, see Point 3. The device is added with the wizard in two steps.
4.1 Basic settings
Huawei SUN2000. Tick the strategies the device should take part in, then click Next.In the second step, enter the communication settings of the inverter.
4.2 Test communication
Click Test communication at the bottom of the wizard. It reads the Huawei SUN2000 once and saves nothing. If the test succeeds, click Done: only Done creates the device.
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Screenshot of the bottom button bar of a Reduxi Configurator page. Left: button 'Back'. Right: button 'Test communication' (marked with a cyan box) and dark button 'Done'.
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Screenshot of the Reduxi Configurator page 'Communication channel and device configuration'. Connection *: TCP/IP (dropdown). IP *: 192.168.50.243, with button 'Scan for IP'. Port *: 502, with button 'Test port'. Modbus unit ID *: 1. Buttons at the bottom: Back (left), Test communication and Done (right). The Done button is marked with a cyan box.
5 Check the readings
5.1 Last measurements
Open Devices → your Huawei SUN2000 device → Last measurements in the Configurator. The values show whether the inverter communicates correctly.
5.2 Control behaviour
For control by the Reduxi strategies, open Devices and your Huawei device in the Reduxi Configurator and set the control type to AUTO. Check the battery charging behaviour against the table in Point 2.
To reduce energy costs with dynamic prices and tariffs, define the strategy as described in Strategies for Reduxi controller.
✓ Summary
Preparation (Point 1): Check the Huawei documentation and the firmware versions of inverter and dongle.
Huawei SDongleA-05 (Point 2): Only the combination inverter V200R023C10SPC209 and dongle V200R022C10SPC210 charges the battery without a limit by the PV output.
Add to Reduxi (Points 3–4): Open the Configurator, add the Huawei SUN2000, enter the communication settings, run Test communication and click Done.
Go live (Point 5): Check the last measurements and set the control type to AUTO.
→ Common issues
| Issue | Solution |
|---|---|
| Battery charging is limited by the PV output | Check the firmware versions of inverter and dongle. In the tested combinations, charging was not limited with inverter V200R023C10SPC209 and dongle V200R022C10SPC210. |
| Test communication fails | Check the communication settings against the inverter and that Controller and inverter can reach each other. |
| Open configurator does not open or stays empty | The tunnel is not active yet. Wait about 30 seconds and check that the controller is online. |
Login with admin is rejected |
The password was changed during installation. Ask the installer. The Reduxi account password does not work here. |
reduxi.local does not load |
Your device is not in the same network as the controller. Use the IP address or the tunnel connection. |
| Communication test fails, device shows offline | Check reachability, IP address / port / unit ID, and that the protocol is enabled on the device. |