In this article
Applies to: Sungrow string inverters using a Sungrow Wi‑Fi dongle (SG_Bxxxx hotspot) with the iSolarCloud app.
Estimated time: 5–10 minutes
You’ll need: iSolarCloud app (logged in), your home Wi‑Fi name & password, physical access to the inverter/dongle.
Quick start
- Confirm your home Wi‑Fi is detectable near the inverter.
- Activate the dongle: press the dongle button 3 times.
- In iSolarCloud: Support → Local Access → scan the dongle QR. Join SG_Bxxxx when prompted. Log in with user / pw1111 (try PW1111 if needed).
- Tap More → WLAN Configuration → choose your home Wi‑Fi → enter password → Confirm.
- Success indicator: the WLAN light on the dongle turns solid blue. If it fails, unplug/reseat the dongle and retry.
Reconnecting with iSolarCloud
Check Wi‑Fi strength at the inverter
- Make sure your home Wi‑Fi is detectable next to the inverter; move the router closer or add a Wi‑Fi extender if the signal is weak.
Put the dongle into pairing mode
- Press the dongle’s button three times quickly. This wakes the local access function needed for setup.
Connect via the iSolarCloud app
- Open iSolarCloud and sign in.
- Go to Support → Local Access.
- Scan the dongle QR code when prompted.
- When your phone asks, join the inverter’s Wi‑Fi network SG_Bxxxx.
Tell the inverter your home Wi‑Fi
- In the local access view, tap More → WLAN Configuration.
- Select your home Wi‑Fi from the list, enter the password, and tap Confirm.
- Watch the dongle: the WLAN light turns solid blue when connected. If it doesn’t, unplug and reconnect the dongle, then repeat the steps.
Troubleshooting & tips
- SG_Bxxxx doesn’t appear: Press the dongle button three times again and stand closer to the inverter. Ensure the dongle is powered.
- Local access password fails: Try both pw1111 and PW1111.
- No connection after confirming Wi‑Fi: Unplug and reseat the dongle, then repeat WLAN Configuration.
- General tip: Many inverter Wi‑Fi modules only work on 2.4 GHz. If your router combines 2.4/5 GHz under one name and the connection fails, try enabling a dedicated 2.4 GHz SSID or temporarily separating the bands.
Frequently asked questions
During setup you’ll join SG_Bxxxx (the inverter’s temporary Wi‑Fi).
iSolarCloud. From the home screen: Support → Local Access to start a local session.
Username: user and Password: pw1111 (or PW1111).
The WLAN LED on the dongle turns solid blue once the inverter is connected to your Wi‑Fi.