Applies to: All Huawei residential inverters with built-in WiFi, including the SUN2000L, SUN2000-L1, SUN2000-M0, SUN2000-M1, and newer SUN2000 KTL series. The process also applies to rebadged Huawei inverters sold under the iStore brand (via the HiSolar app, which uses the same FusionSolar platform).
Estimated time: 5–10 minutes.
You will need
- The FusionSolar app installed and logged in on your smartphone
- Your home WiFi network name and password
- Physical access to your Huawei inverter
- Your inverter's installer password (default is 00000a if it has not been changed)
Most Huawei inverter offline alerts are caused by WiFi disconnection rather than a system fault. Your panels are almost certainly still generating, and your inverter is still feeding the grid. The only thing missing is the data link to the FusionSolar cloud.
Common triggers: changing the WiFi password, installing a new modem or internet provider, router restart, or a recent power outage that caused an IP address reassignment.
Before you start
- Check that your inverter is powered on. The running lights on the front panel should be active (at least the green generation light during daylight hours).
- Stand within a couple of metres of the inverter. The inverter’s WiFi hotspot has limited range.
- Turn off your phone’s mobile data if possible. You will be connecting directly to the inverter’s own WiFi hotspot temporarily, and mobile data can interfere on some phones.
- Confirm your home WiFi is working on another device.
1. Reconnection steps using the FusionSolar app
1.1.
Open the FusionSolar app and sign in with your owner account.
Tap the menu icon (three dots or horizontal lines, top right of the home screen) and select Device Commissioning. On some app versions this is under Me > Device Commissioning.
The app will open the Connect screen. The easiest path is to scan the QR code on the right-hand side of the inverter. The camera will open automatically.
1.2.
If scanning does not work, tap Manual Connection, then select the inverter’s WiFi network from the list. The network will be named SUN2000-[serial number].
When prompted for the WiFi password, enter Changeme (capital C, case-sensitive). This is the default password for the inverter’s own WiFi hotspot.
Once connected, the app will show the inverter’s login screen. From the account dropdown, select Installer.
1.3.
Enter the installer password: 00000a (five zeros, then lowercase a). If this does not work, try 0000000a or your installer may have set a custom password. Contact PSW Life Support if you cannot log in.
Once logged in, tap Settings > Router Connection. On some versions, this is labelled Communication Configuration > WLAN.
A list of nearby WiFi networks will appear. Select your home WiFi network from the list. Remember: Huawei inverters connect only on 2.4 GHz. If your home network is dual-band, select the 2.4GHz version.
1.4.
Enter your home WiFi password and tap Connect.
The app will apply the settings. This can take 1–2 minutes. The inverter’s own WiFi hotspot (SUN2000-…) will disappear once the connection is established, which is the correct outcome.
Reconnect your phone to your home WiFi, then open FusionSolar in normal mode and check the dashboard. Live data should begin flowing within a few minutes.
If it does not work
The SUN2000 WiFi network does not appear in the list
Huawei inverters shut down their own WiFi hotspot after 4 hours of inactivity to save power. Reboot the inverter: turn off the AC isolator, wait until all lights go out, then turn it back on. The hotspot will be available for 4 hours after restart.
The Changeme password is not accepted
Check capital C. If it still fails, the installer may have set a custom WiFi password during commissioning. Contact PSW Life Support with your inverter serial number.
The 00000a installer password is not accepted
This password is changed on first login during professional commissioning. Common alternatives we have seen in the field: 0000000a, Solar123, Inverter123. If none work, contact PSW Life Support. Do not attempt to reset the inverter password without guidance — doing it incorrectly can lock the inverter and require a Huawei service visit.
The inverter accepts the credentials but says "Failed to connect to router"
This is almost always a 2.4GHz vs 5GHz issue. Huawei WiFi modules do not support 5GHz. See the “WiFi compatibility” section below.
Device detected from unauthorised channel error
This is a server region mismatch. The inverter may be set to the wrong FusionSolar server. Contact PSW Life Support; this requires installer-level adjustment via FusionSolar.
Huawei inverter LED reference
Huawei SUN2000 inverters have a row of LED indicators. The states relevant to WiFi connectivity are:
| Light | Status | Meaning |
|---|---|---|
Communication (envelope icon) | Off | No active data connection. |
Communication | Blinking green (slow) | Connected to the router and communicating with FusionSolar. Normal operation. |
Communication | Blinking green (fast) | Currently exchanging data. |
Communication | Blinking red | Connection problem — typically Wi-Fi disconnection or server unreachable. Follow the reconnection steps above. |
Communication | Solid red | Communication module fault. Power-cycle the inverter. If the fault persists, contact PSW Life Support. |
Run (sun icon) | Blinking green | Normal operation, generating power. |
Run | Off | Inverter not producing (normal at night, unexpected during the day — contact PSW Life Support). |
Alarm (triangle icon) | Off | No active alarms. |
Alarm | Red (any state) | Active alarm. Check FusionSolar for details and contact PSW Life Support if unsure. |
WiFi compatibility: common issues in Perth
Your router uses both 2.4GHz and 5GHz bands
Huawei inverter WiFi modules only connect to 2.4GHz networks. They cannot see 5GHz bands. If your router broadcasts both bands under a single network name (common with NBN-supplied routers and Telstra Smart Modems), the inverter may fail to connect or drop out intermittently.
Fix: Log in to your router’s admin page (typically at 192.168.0.1 or 192.168.1.1) and either:
- Split the bands into two separate networks (e.g.,
HomeWiFiandHomeWiFi-5G), then connect the inverter to the 2.4GHz network, or - Temporarily disable the 5GHz band during setup, then re-enable it afterwards.
WiFi signal at the inverter
Huawei inverters are commonly installed in garages, under eaves, or on external walls, often a long way from the home router. If the WiFi signal at the inverter is below 3 bars, the connection will be unreliable even if it initially succeeds.
Fix: Check the signal strength on your phone while standing next to the inverter. Options if it is weak:
- Add a WiFi mesh node or extender in the garage or closer to the inverter
- Use a wired Ethernet connection. Some Huawei inverters support LAN via a Huawei Smart Dongle-LAN, which PSW can supply and install. A wired connection is the most reliable option for long-term stability.
FusionSolar app versus SUN2000 app
There are two apps: FusionSolar (homeowner monitoring + device commissioning) and SUN2000 (installer-focused commissioning tool). For reconnection after installation, use FusionSolar. The credentials are the same, your cloud account for monitoring, and 00000a for the inverter’s local installer login.
When to contact PSW Life Support
Contact us if:
- You cannot log in with any of the default installer passwords
- The SUN2000 WiFi hotspot does not appear even after a power cycle
- The Communication light remains solid red after reconnection attempts
- You receive a “Device detected from unauthorized channel” error
- Your system is not generating power (not just a monitoring issue)
- Data does not return to FusionSolar within 24 hours of a successful reconnection
Phone: (08) 6171 4111
Email: hello@pswenergy.com.au
Online: Lodge a support request at PSW Life Support
Have ready: your inverter serial number (on the label on the right side of the inverter), a photo of the inverter’s LED lights, and a note of what happened at each step you tried.
