Applies to: All Sungrow string inverters and hybrid inverters using a Sungrow Wi-Fi communication dongle (WiNet-S, WiNet-S2, or older WLAN dongle) with the iSolarCloud app.
Estimated time: 5–10 minutes.
You will need
- The iSolarCloud app installed and logged in on your smartphone
- Your home Wi-Fi network name and password
- Physical access to your inverter and the Wi-Fi dongle attached to it
If your Sungrow inverter has stopped sending data to the iSolarCloud app, the most likely cause is a Wi-Fi disconnection. Your system is almost certainly still generating power. The only thing affected is your ability to see production data in the app.
Common triggers include a changed Wi-Fi password, a new internet provider or modem, a router restart that assigned a new IP address, or a temporary power outage. The fix takes a few minutes and does not require an electrician.
Not sure which dongle you have? Look at the small module plugged into the bottom of your inverter. If the three indicator lights are labelled RUN, WLAN, and LAN, you have a WiNet-S or WiNet-S2 dongle — follow Method 1 below. If the lights are labelled RUN, COM, and NET, you have an older WLAN dongle, follow Method 2.
Method 1: WiNet-S/2 dongle
Most common
This is the dongle fitted to the majority of Sungrow inverters installed since 2021, including the SG series string inverters and SH series hybrid models.
Before you start
- Confirm your home Wi-Fi is working. Open any website on your phone while connected to your home network. If your Wi-Fi is down, fix that first.
Stand within a few metres of your inverter. The dongle’s Wi-Fi range is limited, and you need a reliable connection between your phone and the dongle during setup.
Check that the dongle’s RUN light is blinking green. This confirms the dongle is powered and operational. If the RUN light is off, the dongle may not be receiving power from the inverter. Check that it is firmly seated in the port at the bottom of the inverter.
Reconnection steps
1.1.
Press the multi-function button on the WiNet-S dongle three times. This activates the dongle’s WiFi hotspot, which broadcasts a network named SG-[serial number] (the serial number is printed on the dongle label, below the QR code). The WLAN light will start blinking rapidly.
Open the iSolarCloud app on your phone and sign in.
Tap Support (bottom navigation bar), then Local Access.
1.2.
A camera screen will appear. Scan the QR code on the front of the dongle.
Your phone will prompt you to join the dongle’s Wi-Fi network (SG-xxxxxxxx). Tap Join.
1.3.
An identity verification screen will appear. Enter the default credentials:
- Account: admin
- Password: pw1111
- If that does not work, try PW1111 (case-sensitive)
Tap Verification to proceed.
1.4.
Tap More in the bottom navigation bar, then select WLAN Configuration.
A list of available Wi-Fi networks will appear. Select your home WiFi network from the list.
Enter your home WiFi password and tap Confirm.
Wait 15–20 seconds. The app will display a success message, and the WLAN light on the dongle will change from blinking to solid blue. This confirms the connection.
Reconnect your phone to your home Wi-Fi network (it may still be connected to the dongle’s hotspot). Open iSolarCloud, tap Home, and check that live data is appearing. It can take up to 15 minutes for historical data to backfill.
If it does not work
The SG-xxxxxxxx network does not appear
Press the dongle button three times again. Make sure you are standing close to the inverter. If the WLAN light is not blinking rapidly after pressing three times, unplug the dongle from the inverter, wait 10 seconds, and plug it back in firmly. Then try again.
Password verification fails
Try both pw1111 and PW1111. If neither works, the password may have been changed during installation. Contact PSW Life Support with your inverter serial number and we can assist.
"Failed to set password" or Wi-Fi password not accepted
This is commonly caused by your router broadcasting only on 5GHz, or using WPA3 security that the dongle does not support. See the “Wi-Fi compatibility” section below for fixes.
WLAN light does not turn solid blue after confirming
Unplug the dongle, wait 10 seconds, reconnect it, and repeat the WLAN Configuration steps from step 8. If it fails a second time, try the browser-based method described in Method 3 below.
Method 2: Older WLAN dongle
RUN / COM / NET lights
This dongle was fitted to Sungrow inverters installed before 2021, including earlier SG-D, SG-KTL-M, and SG-K-20 models.
Reconnection steps
2.1.
Open your phone’s Wi-Fi settings and look for a network starting with SG_B followed by a string of characters. This is the dongle’s hotspot. If you do not see it, press the button on the dongle once and wait 30 seconds.
Connect your phone to the SG_Bxxxx network. Your phone may warn that this network has no internet access. That is expected.
2.2.
Open the iSolarCloud app and sign in.
Tap More (bottom navigation bar).
Tap WLAN Configuration.
A pop-up will confirm you are connected to the inverter. Tap Next.
2.3.
Go to your phone’s Wi-Fi settings and select your home Wi-Fi network. Enter your password.
Return to the iSolarCloud app. A tick will confirm the connection was successful. Tap Next, then Complete.
The NET light on the dongle should turn solid green within a few minutes, confirming internet connectivity. Log out of iSolarCloud and log back in to refresh the data feed.
Method 3: Browser-based fallback
Both dongle types
If the iSolarCloud app method is not working, you can configure the WiFi connection directly through the dongle’s built-in web interface. This method works from a laptop, tablet, or phone browser.
3.1.
Activate the dongle’s hotspot:
WiNet-S/S2: Press the multi-function button three times.
Older WLAN dongle: Press the button once.
3.2.
Connect your device to the dongle’s Wi-Fi network (SG-[serial] or SG_Bxxxx).
Open a web browser (Chrome recommended) and navigate to 11.11.11.1.
Click Login in the upper right corner.
3.3.
Enter the credentials:
Username: admin
Password: pw8888 (note: this is different from the app password)
Navigate to System > Port Parameter > WLAN.
3.4.
After configuring, disconnect from the dongle’s hotspot and reconnect to your home Wi-Fi. Check iSolarCloud for incoming data.
Wi-Fi compatibility: common issues in Perth
Your router uses both 2.4GHz and 5GHz bands
Sungrow Wi-Fi dongles only connect to 2.4GHz networks. They cannot see or connect to 5GHz bands. If your router combines both bands under a single network name (common with NBN-supplied routers and Telstra Smart Modems), the dongle may fail to connect.
Fix: Log in to your router’s admin page and either:
- Split the bands into two separate network names (e.g., “HomeWiFi” for 2.4GHz and “HomeWiFi-5G” for 5GHz), then connect the dongle to the 2.4GHz network. Or:
- Temporarily disable the 5GHz band, configure the dongle, then re-enable 5GHz.
Your router’s admin page is typically at 192.168.0.1 or 192.168.1.1. The login details are usually on a sticker on the router itself.
Telstra Smart Modem Gen 2/3 and WPA3
Newer Telstra Smart Modems default to WPA3 security. Older Sungrow dongles (and some WiNet-S units with older firmware) do not support WPA3 and will fail to authenticate, often showing a “Failed to set password” error.
Fix: Log in to your Telstra Smart Modem admin page (192.168.0.1, default credentials on the modem sticker). Navigate to Wi-Fi settings and change the security mode from WPA3 to WPA2/WPA3 mixed mode or WPA2-PSK. This allows the dongle to connect while maintaining compatibility with your other devices.
Weak WiFi signal at the inverter
Inverters are often installed in garages, on external walls, or near switchboards. Steel garage doors, brick walls, and distance from the router can all weaken the signal below what the dongle needs.
Fix: Check the Wi-Fi signal on your phone while standing next to the inverter. If it shows one bar or drops out, consider:
- Moving the router closer (if practical)
Adding a Wi-Fi range extender positioned between the router and the inverter
Using a LAN cable (Ethernet) connection if your inverter and dongle support it. WiNet-S and WiNet-S2 dongles have a LAN port. A direct cable connection is more reliable than Wi-Fi and is recommended where cabling is practical.
WiNet-S dongle LED reference
| Light | Status | Meaning |
|---|---|---|
RUN | Off | Dongle has no power. Check it is seated firmly in the inverter. |
RUN | Blinking green | Normal operation. |
RUN | Solid red | Dongle fault. Unplug, wait 10 seconds, reconnect. If the fault persists, the dongle may need replacement. Contact PSW Life Support. |
WLAN | Off | Not connected to any Wi-Fi network. Needs reconfiguration (follow Method 1 above). |
WLAN | Solid blue | Connected to your home Wi-Fi and communicating with iSolarCloud. This is what you want to see. |
WLAN | Blinking slowly (1-second intervals) | Exchanging data with iSolarCloud. Normal during active data upload. |
WLAN | Blinking rapidly (0.2-second intervals) | SmartConfig / EasyConnect mode is active. This is the initial setup mode and should not persist during normal operation. |
LAN | Off | No Ethernet cable connected (normal if using Wi-Fi). |
LAN | On or blinking | Ethernet cable connected and communicating. |
When to contact PSW Life Support
Contact us if:
- You have followed the steps above and the dongle WLAN light does not turn solid blue after two attempts
- The dongle RUN light is solid red (hardware fault)
- You cannot find the dongle’s hotspot network even after pressing the button and reseating the dongle
- Your iSolarCloud app does not recognise the QR code on the dongle
- Data has not returned to iSolarCloud within 24 hours of a successful reconnection
You are unsure whether your system is generating power (not just a monitoring issue)
Phone: (08) 6171 4111
Email: hello@pswenergy.com.au
Online: Lodge a support request at PSW Life Support
Have ready: your inverter serial number, the dongle serial number (on the dongle label), the current LED state, and a note of what happened when you tried the steps above. A photo of the dongle LED is helpful.
