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Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar

Bob271 430464 1369
Best answers

How do I get a Huawei SUN2000 Wi‑Fi dongle online when FusionSolar shows the SDongleA as offline?

To get the dongle/configuration working, connect to the inverter’s own Wi‑Fi AP, open FusionSolar, choose “Putting the device into operation,” scan the QR code on the inverter and enter the password from the label (or the default 00000a if it was not changed) [#18928339][#19344455] If Wi‑Fi setup keeps failing, one user gave up on wireless and connected the dongle/router by Ethernet cable directly, which worked immediately [#18870485] Another user reported that installing the latest FusionSolar fixed a case where the dongle was detected but all networks looked open and no connection would complete [#19386137] During commissioning and software updates, the inverter should have DC power available; without DC, Huawei units may behave oddly and not finish configuration/update properly [#18871886]
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  • #391 19777170
    karol4000
    Level 12  
    Connect to the WiFi dongle, or via fusionsolar from the installer account
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  • #392 19777171
    bogdan11
    Level 11  
    Download the new firmware from Huawei to the phone and then connect the SUN2000 to the inverter
  • #393 19777196
    qrko
    Level 14  
    karol4000 wrote:
    Connect to the wifi dongle, or via fusionsolar from the installer account

    The problem is that I only see an inverter as AP, i.e. SUN2000xxxxx, there is no dongle.

    bogdan11 wrote:
    Download the new firmware from Huawei to the phone and then connect the SUN2000 to the inverter

    I have this soft from the previous pages:
    https://mega.nz/file/888nDCqC#AQk3qYMYsueXrQn2BGdk7spO_0afP76kIcg5uSb5TrI
    just how to squeeze it through the SUN2000? Select a different file at the inverter and indicate? Is the second MBUS item?
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
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  • #394 19777219
    gitpusher
    Level 12  
    qrko wrote:
    karol4000 wrote:
    Connect to the wifi dongle, or via fusionsolar from the installer account

    The problem is that I only see an inverter as AP, i.e. SUN2000xxxxx, there is no dongle.


    Have an installer account?
    https://skyboo.net/2021/09/how-to-do-a-firmware-upgrade-using-fusionsolar/

    I did not do it from the app, but I know that the dongle in wifi mode broadcasts for a short period after restarting (or the entire inverter or after removing / inserting USB).
    Also look on these screens - maybe they will guide you ...
    https://forum.huawei.com/enterprise/en/instal...le-on-sun2000-3-20ktl-m0/thread/606418-100027
  • #395 19777950
    qrko
    Level 14  
    gitpusher wrote:
    qrko wrote:
    karol4000 wrote:
    Connect to the wifi dongle, or via fusionsolar from the installer account

    The problem is that I only see an inverter as AP, i.e. SUN2000xxxxx, there is no dongle.


    Have an installer account?
    https://skyboo.net/2021/09/how-to-do-a-firmware-upgrade-using-fusionsolar/


    Thanks. In fact, a short while after the reboot, Dongel acts as AP. After entering the same password as for the inverter and connected via SUN2000, I was able to push the package linked above,
  • #397 19778368
    qrko
    Level 14  
    I don't need it, this one works with Home Assistant.
    What about the second item from the screen - MBUS? Are you updating it? The SPC300 appears there for me to choose and install.
  • #398 19778483
    gitpusher
    Level 12  
    @qrko
    I've never picked it up but I don't even know if my model has it ...
    What is this - it is for communication on the power grid?
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  • #399 19781299
    rookie116
    Level 5  
    Hello, through which application is it better to upload the inverter and dongle upgrade? Fusionsolar or Sun2000? Recently I was doing an inverter upgrade via Fusionsolar (being logged in as user) and the installation in Fusionsolar disappeared. My installer had to connect the installations to my login via the web.
  • #400 19781726
    karolb863
    Level 9  
    Hi,
    the fusion solar application has not been working since yesterday, I also cannot log in to the website (website not reachable), the dongle flashes red, when I scan the QR code from the inverter, a message appears that it is impossible to connect, the wi-fi network with the dongle is not available Internet connection - this is the message I have when I choose the sun2000 wi-fi network.
    what can I do from my level - I will write immediately that I am not fluent in computer science ;)
    Does this inverter work normally, despite the lack of internet connection, the two lights are green and the third one is flashing from wi-fi?
    I did not update anything, sometimes it freezes, but most often removing the dongle and putting it back on fixes the problem, and now unfortunately not.
  • #401 19781741
    karol4000
    Level 12  
    0 service work until the new year
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  • #402 19781764
    gitpusher
    Level 12  
    karolb863 wrote:
    Hi,
    Does this inverter work normally, despite the lack of internet connection, the two lights are green and the third one is flashing from wi-fi?

    Yes - if the first two are lit, it gives energy to the grid
    Dongle has been freaking out since yesterday because of the lack of a cloud (as @ karol4000 wrote - they have maintenance work - they reported on fusionsolar - via the website).

    I was sneezing from around 7:20 pm to midnight. Then, by around 4 a.m., it returned to normal and is still not working until now - they are probably modernizing something sharply.
    A side effect that is not too cool is that this dongle senses "no cloud" and reboots cyclically causing Link Down / Link Up. By the way, causing problems with reading it after modbus / tcp.
  • #403 19781785
    karolb863
    Level 9  
    karol4000 and gitpusher, thank you very much for the information :)
  • #404 19782409
    k_zako
    Level 8  
    Hello. I have a question. Yesterday, the inverter was updated by Fusionsolar to version 140. When the update was about 85%, a message appeared that the phone lost connection with the inverter. The inverter has restarted and has restarted. When I enter the option to check the software version, there is version 140 there, which is as if the update had been made. How do you think I should leave it like that or try and repeat the update to be successful? I do not know if the inverter is currently working properly because I am not at home and the cloud is not working.
  • #405 19782626
    bogdan11
    Level 11  
    This is the correct course of the update. Don't fix anything
  • #406 19782881
    k_zako
    Level 8  
    Approx. Even if at the end I did not receive the message about a successful update?
  • #407 19782886
    bogdan11
    Level 11  
    That's what it breaks off, but this type is
  • #409 19783500
    qrko
    Level 14  
    SPC126 firmware dongle straight from the support if someone does not want to wait for their application to be processed.
    Attachments:
    • SDongle_V100R001C00SPC126_package.zip (3.48 MB) You must be logged in to download this attachment.
  • #410 19787822
    akir19
    Level 10  
    I was flying on version 123 in the dongle, I updated to 126 and stopped sending to Home Assistant for LAN. Should something be re-enabled in the Fusionsolar app? The data from the Fusionsolar cloud is further sent to the application, so the dongle itself works
  • #411 19787836
    domelek
    Level 17  
    akir19 wrote:
    I was flying on version 123 in the dongle, I updated to 126 and stopped sending to Home assistant for lan. Should something be re-enabled in the fusionsolar app? The data from the fusionsolar cloud is further sent to the application, so the dongle itself works

    log in via the SUN2000 app and check the communication options, because now you can enable / disable access to modbus tcp ...
  • #412 19788378
    akir19
    Level 10  
    This is exactly what I turned on the modbus again
  • #413 19795838
    szeryfff
    Level 24  
    Colleagues, how do you connect the inverter with HA? On the terminal where I have HA, I connect to the SUN2000 inverter network ..., in HA the fusion_solar integration works ok. The limitation is that the terminal must be within the range of the inverter. There is another way?
  • #414 19796144
    lizak1983
    Level 15  
    @szeryfff
    With the new firmware in the dongle, you can also connect via ethernet or directly via WiFi of the dongle, i.e. via the address of the inverter in the home network.
  • #416 19797417
    akir19
    Level 10  
    That's how I uploaded it since December. Works without major changes, in my installation the Battery bank disappeared from the application that I never had. Maybe not so much as disappeared. But it didn't reappear.
  • #417 19800809
    ak12345
    Level 2  
    And I'm with such a problem. I wanted to connect my installation to HomeAssistant, but after reading many threads in this topic, I checked that I have the firmware version 135/119, so I wrote to the support to send me newer firmware and installation instructions.
    However, they offered to update the inverter and dongle for me remotely - so I agreed.
    They uploaded the 140/126 version to me and it turned out that today, in cloudy weather, the inverter did not produce anything at all - total 0 and did not even change the start and stop times of the installation - it wrote all the time that too little sunlight, although in the past, even in worse weather, something could do to produce. I wrote to them that something was wrong and that they would upload the older version to me, but so far they have not written back anything.

    I would like to add that from the inverter configuration level I activated the modbus and nicely connected to HomeAssistant after wifi and it shows beautiful 0 :)

    I have already downloaded the older firmware 139/124 from the forum, and I wonder if it makes sense to upload the inverter and dongle update, or maybe leave the dongle on 126 (because it looks ok) and only the inverter should be uploaded older, or maybe wait for them to write back from the support.

    Anyone had similar dilemmas?
  • #418 19800858
    Robyn212
    Level 16  
    ak12345 wrote:
    And I'm with such a problem. I wanted to connect my installation to HomeAssistant, but after reading many threads in this topic, I checked that I have the firmware version 135/119, so I wrote to the support to send me newer firmware and installation instructions.
    However, they offered to update the inverter and dongle for me remotely - so I agreed.
    They uploaded the 140/126 version to me and it turned out that today, in cloudy weather, the inverter did not produce anything at all - total 0 and did not even change the start and stop times of the installation - it wrote all the time that too little sunlight, although in the past, even in worse weather, something could do to produce. I wrote to them that something was wrong and that they would upload the older version to me, but so far they have not written back anything.

    I would like to add that from the inverter configuration level I activated the modbus and nicely connected to HomeAsssistant after wifi and it shows beautiful 0 :)

    I have already downloaded the older firmware 139/124 from the forum, and I wonder if it makes sense to upload the inverter and dongle update, or maybe leave the dongle on 126 (because it looks ok) and only the inverter should be uploaded older, or maybe wait for them to write back from the support.

    Anyone had similar dilemmas?


    And when the app showed you the lack of production, did you check it physically on the inverter? I mean how the LEDs behaved.
  • #419 19800951
    akir19
    Level 10  
    They write back from the support immediately, wait. Check today if the inverter will get up, I had the inverter turned off after the update in the options. I woke him up remotely, but after dark, he was producing for the next day. Log in as an installer via www, or see your permissions on www. You can also check locally via the inverter hotspot as an installer whether the production is sometimes off
    Attachments:
    • Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar IMG_20220105_052300.jpg (194.56 KB) You must be logged in to download this attachment.
  • #420 19800971
    ak12345
    Level 2  
    I do not have an installer account via www, but when I connected locally via hotspot to the inverter, it showed the same, i.e. no production all day. As a preventive measure, I hard reset the device.
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Topic summary

✨ The discussion centers on issues and configurations related to Huawei SUN2000 series inverters, particularly focusing on WiFi dongle connectivity, firmware updates, and the FusionSolar platform. Users report successful inverter commissioning and firmware updates but face persistent problems connecting the WiFi dongle, which often blinks red and appears offline in FusionSolar. A reliable workaround is connecting the dongle via Ethernet cable to the router. Changing WiFi network credentials requires logging directly into the inverter through FusionSolar or FusionHome apps, as remote password changes are not supported. Installer accounts have broader configuration permissions than owner accounts, which often restrict access to settings such as location, currency, and power configuration. The discussion also covers optimal network code selection (e.g., Germany-VDE-AR-N-4105 for Poland), MPPT multi-peak scanning settings for shadowed panels, and string capacity configuration aligning with physical panel connections. Users note that inverter startup voltage and MPPT voltage ranges affect minimum panel string length, with debates on using 140V or 240V for calculations. Firmware updates are available but may not always be visible to all users simultaneously; some recommend downgrading FusionSolar app versions to resolve login or configuration issues. The FusionSolar platform's interface and permissions can be non-intuitive, with some users unable to modify installation parameters without installer access. Additional topics include inverter automatic shutdown due to high grid voltage, anti-PID function requiring external devices, and integration with Huawei DTSU666-H smart meters, which are often auto-detected. Overall, the thread provides practical advice on inverter setup, network configuration, firmware management, and troubleshooting communication issues with Huawei SUN2000 inverters and associated software tools.
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FAQ

TL;DR: A 10-min average grid voltage ≥ 253 V forces the SUN2000 inverter to disconnect [Elektroda, lizak1983, post #19657944] “Huawei is a good inverter, I would not be afraid to install it” [Elektroda, Rhaavir, post #18871886] Latest firmware SPC136 fixes battery and startup issues.

Why it matters: Correct settings stop nuisance shutdowns, improve yield and keep the warranty intact.

Quick Facts

• Default grid code for PL installers: Germany VDE-AR-N-4105 or Custom 50 Hz with 253 V/10-min limit [Elektroda, domelek, post #19529531] • SUN2000-M0/M1: MPPT range 200–850 V; Startup 200 V; Max string current 11 A (oper.), 15 A (Isc) [Huawei Datasheet]. • Firmware: SPC136 (inverter) & SPC118 (SDongleA-05) – update in daylight, 20 min per device [Elektroda, lizak1983, post #19640000] • Wi-Fi dongle LED codes: steady green = online; red blink = no router link [Elektroda, JackRze, post #19489029] • Warranty checker: https://support.huawei.com – serial + e-mail required [Elektroda, maneks, post #19359819]

How do I change the inverter’s Wi-Fi after replacing a router?

  1. On the router set the new SSID and password identical to the old ones – the inverter reconnects automatically [Elektroda, lizak1983, post #19657944]
  2. If you prefer to edit the inverter, open the SUN2000 app, connect to the inverter’s AP, choose Maintenance > Communication > Router Wi-Fi and enter the new credentials; save and wait for the LED to turn steady green.

What causes the SUN2000 to trip on sunny days?

A 10-minute average grid voltage at the terminals above 253 V triggers disconnection per VDE-AR-N-4105 [Elektroda, lizak1983, post #19657944] High roof-top cable resistance adds 1-2 V, so measure at the inverter. Load shifting (e.g., 2 kW boiler) or DSO tap change fixes the issue.

Can I lift the 253 V reconnection limit?

Raising “Upper voltage limit when reconnecting to grid” breaches EU NC RfG and risks neighbour equipment damage. Installers and DSOs can audit logs [Elektroda, rokbok, post #19639893] Keep 253 V unless your DSO grants a written exception.

Firmware: what’s new in SPC136 and how do I install it?

SPC136 adds battery-version alarm, M1–M3 parallel support and faster offline self-check [Huawei ReleaseNotes 2021]. Download via SUN2000 or FusionSolar app (Me > Device Commissioning > Update). Stay within inverter Wi-Fi, tap Update, wait ~20 min; the inverter reboots once at ~80 % [Elektroda, MisiekDPx, post #19639882]

How do I update the SDongleA-05 Wi-Fi dongle?

Unplug the dongle, re-insert: it broadcasts “Dongle–AP”. Connect with SUN2000 app, default pwd 00000a, go to Maintenance > Update Device, choose SPC118 file and start. LED blinks fast green during upgrade, steady green when done (≈10 min) [Elektroda, lizak1983, post #19640000]

Grid code list shows only three Chinese entries – what now?

Import units lack EU presets. Select Custom 50 Hz and manually enter: U/Un 0.85 = 0 s, 1.10 = 10 min, 1.15 = 0.1 s; cos φ = 0.9 lead/lag; Q/U droop 4 % [Elektroda, domelek, post #19529531] A valid NC RfG declaration is still required for DSO acceptance.

My Wi-Fi dongle flashes red every few days – fix?

LED red blink means router unreachable. Common causes: weak signal or changed password. Move a repeater within 5 m (-55 dBm or better) [Elektroda, JackRze, post #19489219] If stable signal still fails, reboot the dongle or update its firmware (see above).

Installer owns the FusionSolar site – can I get control?

Yes. Ask the installer to delete the plant from their account, then register a new Installer account with your e-mail and inverter serial; Huawei cloud blocks duplicate serials [Elektroda, rokbok, post #19636492] Warranty remains tied to the serial, not the account.

Lost inverter password – how to reset?

Connect SUN2000 app to the inverter AP, choose “Reset Password”. You must input the 6-digit ESN from the side sticker and the current date. The default admin password resets to 00000a [Huawei Manual].

What’s the correct string current for SUN2000-M1?

Design strings so Isc ≤ 15 A and operating current ≤ 11 A. Example: 12×340 W modules give Isc 10.3 A, within limits [Elektroda, mariusz.lubicz, post #19656018] Exceeding Isc risks optimizer derating and warranty issues.

Will Huawei optimizers shut a whole string when one panel is shaded?

No. Each SUN2000-450W-P acts as a DC/DC converter. A shaded panel continues at lower power while the rest maintain maximum current [Elektroda, jsw, post #19656269] The inverter therefore keeps production and avoids hot-spot bypass.

How do I clear old alarms in FusionSolar?

Go to Device > Alarms, tap the three-dot menu, choose “Clear”. Alarms caused by firmware mismatch disappear automatically after updating both inverter and dongle [Elektroda, stratus84, post #19490242]

Edge case: inverter shows 2 V DC after switch-on – diagnosis?

Reverse-polarity MC4 crimps drop the PV voltage to ≈ 2 V and block startup [Elektroda, kravat3, post #19536568] Disconnect, verify red = + and black = – with a multimeter, then re-crimp.

Quick 3-step: add new owner without installer

  1. Installer deletes plant in FusionSolar. 2. Owner installs SUN2000 app, taps “Create Installer Account”, enters S/N and e-mail. 3. Log in, add plant, then invite personal “Owner” user. Done.
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