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

Bob271 430488 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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  • #601 19937694
    liseczq
    Level 21  
    domelek wrote:
    liseczq wrote:
    strucel wrote:
    In a few days, if you do nothing, he will get the Authorization timeout Timeout status: 1


    Thanks, and can't I approve this authorization somewhere? It is a pity that the device was useless for so long.

    login as owner not installer, or create an owner account first ... and then login


    Let me tell you that it was simple on the old application ... Now I can see how bottom the Huawei application is. Terribly underdeveloped.
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  • #602 19937789
    domelek
    Level 17  
    liseczq wrote:
    domelek wrote:
    liseczq wrote:
    strucel wrote:
    In a few days, if you do nothing, he will get the Authorization timeout Timeout status: 1


    Thanks, and can't I approve this authorization somewhere? It is a pity that the device was useless for so long.

    login as owner not installer, or create an owner account first ... and then login


    Let me tell you that it was simple on the old application ... Now I can see how bottom the Huawei application is. Terribly underdeveloped.


    Do it via www SYSTEM / COMPANY MANAGEMENT / USER MANAGEMENT
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  • #603 19938167
    gitpusher
    Level 12  
    domelek wrote:
    What for?! It will turn off the AC first - the inverter disconnects - no production and then disconnects the DC ... the other way around ... first DC then AC, but what is better to do a little after sunset, when the voltages are already lower. DC current is very dangerous ...


    For what? This is me too straight from the inverter manual:
    "WARNING:
    If the DC input cable is connected in reverse, do not use a DC switch or the positive and negative connectors. Wait until the illumination weakens at night and the current from the PV string is below 0.5A, then turn off the DC switch.
    Disconnect the positive and negative poles to reverse polarity. "
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  • #604 19940854
    MaciejSUN
    Level 5  
    I will return to the topic of too high voltage in the network. Huawei sun2000 / 4kw. I live on a street where almost everyone has a solar farm. And this year it started. From 10-14 inverter in continuous reset. I ordered a paid service to check the voltage in the network from Tauron. Because, as I asked in the neighborhood, all the production runs without interruptions. I am sending some screenshots of my activities. Although I have the option to log into the inverter from the installer position, I relied heavily on our PN. We'll see what Tauron says. And I wonder what can be changed / set in reactive power? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
  • #605 19941280
    wyimag11
    Level 10  
    wyimag11 wrote:
    Hello
    Have any of you encountered the message in Fusion Solar "Device detected from unauthorized channel. Access denied"?
    I bought a Sun2000 8ktl M0 inverter from an importer - a Polish warehouse, Chinese version, connected with Fusion Solar, there was a prompt to update, I updated, set up Internet access via LAN - everything ok (despite the Chinese stamps). Then I wanted to add the inverter to the created installation in Fusion Solar and then this access denied message started to appear. Does anyone have any idea?


    I would like to refresh the topic. It's been a long time fought with this and I still can't add this inverter to Fusion Solar because of the message below. I am asking for some help or hint. Is it currently possible to add a Chinese version for installation in Fusion Solar or any other remote viewing option outside of HomeAssistant? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
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  • #606 19941284
    domelek
    Level 17  
    wyimag11 wrote:
    wyimag11 wrote:
    Hello
    Have any of you encountered the message in Fusion Solar "Device detected from unauthorized channel. Access denied"?
    I bought a Sun2000 8ktl M0 inverter from an importer - a Polish warehouse, Chinese version, connected with Fusion Solar, there was a prompt to update, I updated, set up Internet access via LAN - everything ok (despite the Chinese stamps). Then I wanted to add the inverter to the created installation in Fusion Solar and then this access denied message started to appear. Does anyone have any idea?


    I would like to refresh the topic. It has been fought for a long time and I still cannot add this inverter to Fusion Solar because of the message below. I am asking for some help or hint. Is it currently possible to add a Chinese version for installation in Fusion Solar or any other remote viewing option outside of HomeAssistant? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Maybe try to call / write to the Polish support, I had no such problems a year ago, but in the meantime I contacted them for a different reason and they did not have any problems with the answer (I also have an import).
  • #607 19941286
    wyimag11
    Level 10  
    I contacted them, but unfortunately they did not want to help me when they realized that it was the Chinese version.
  • #608 19941313
    akir19
    Level 10  
    Check out the fusion home application
  • #609 19941369
    wyimag11
    Level 10  
    I checked Fusion Home but it only works locally on the inverter wifi. I am still wondering if Fusion Home would work if I put a VPN in place and then tried to connect. Could someone be doing something like that?
  • #610 19941373
    akir19
    Level 10  
    I was more wondering if you can upload the European firmware to him
  • #611 19941451
    rokbok
    Level 39  
    wyimag11 wrote:
    I checked Fusion Home but it only works locally on the inverter wifi.


    Not true, it also works over home WiFi, but you need to set your WiFi on the inverter, and the SUN2000 app also works.
  • #612 19945273
    xszuflax
    Level 11  
    Hi,

    I have a question a little OT. Have you managed to reach the maximum inverter production this year? I have a SUN2000-6KTL-M1 inverter with 2 strings of 9 panels each, the power from the leaflet is 6.4 KWp installation from December. In principle, these panels should have a little more than the 6.4 KWp. Installation to the south, the roof of the panels at an angle of 40 degrees. Yesterday near Wrocław with full sun ~ 20 degrees Celsius the graph looked like this:

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

    I don't have any major problems with that, so I ask out of curiosity.
  • #613 19945863
    kotbury
    Gantry automation specialist
    For such an angle of the panels, the sun perpendicular to them will be around April 19 at noon winter time (i.e. at 13 summer time) and then measure the maximum efficiency.
    And the "astronomical" performance of the sun (and of the panel) would be maximum on the summer solstice (around June 21) and on the condition that the panel is positioned perpendicular to the rays at noon, i.e. at an angle of 30 degrees - because then in our conditions the light has the shortest path through the atmosphere, assuming a dry summer and no fog in the air (the highest efficiency would be at the equator, but ... ;) ).
  • #614 19945924
    xszuflax
    Level 11  
    kotbury wrote:
    For such an angle of the panels, the sun perpendicular to them will be around April 19 at noon winter time (i.e. at 13 summer time) and then measure the maximum efficiency.


    Thanks for the hint :-)
  • #615 19955212
    benpot
    Level 11  
    MaciejSUN wrote:
    I will return to the topic of too high voltage in the network. Huawei sun2000 / 4kw. I live on a street where almost everyone has a solar panel. And this year it started. From 10-14 inverter in continuous reset. I ordered a paid service to check the voltage in the network from Tauron. Because, as I asked in the neighborhood, all production works without interruptions. I am sending some screenshots of my activities. Although I can log in to the inverter from the installer position, I relied heavily on our PN. We'll see what Tauron says. And I wonder what can be changed / set in reactive power? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Hi,
    Did you fight against Tauron? What is the cost of installing such an analyzer on the connection point? for what period of time do they mount it?

    When it comes to reactive power control, it proposes Q / S compensation and edit the curve points on the graph depending on your needs.
  • #616 19956534
    xszuflax
    Level 11  
    benpot wrote:
    MaciejSUN wrote:
    I will return to the topic of too high voltage in the network. Huawei sun2000 / 4kw. I live on a street where almost everyone has a solar panel. And this year it started. From 10-14 inverter in continuous reset. I ordered a paid service to check the voltage in the network from Tauron. Because, as I asked in the neighborhood, all production works without interruptions. I am sending some screenshots of my activities. Although I have the option to log into the inverter from the installer position, I relied heavily on our PN. We'll see what Tauron says. And I wonder what can be changed / set in reactive power? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Hi,
    Did you fight against Tauron? What is the cost of installing such an analyzer on the connection point? for what period of time do they mount it?

    When it comes to reactive power control, it proposes Q / S compensation and edit the curve points on the graph depending on your needs.



    I will just add here that too high voltage may be caused by tightened wires. If I were you, I would go all the way and tighten / check all the wires in the boxes and at the safeguards.

    Inspiration here: https://www.youtube.com/watch?v=38cv6WXsL-A
  • #617 19962246
    TomiF19
    Level 10  
    Hello. I would be grateful if someone uploaded the latest software of the inverter with the ending 142, which was released on 04/02/2022.
    Greetings.
  • #618 19963112
    andrzejewskikam
    Level 6  
    I have such a problem, I wanted to change the WiFi network in the inverter, I logged in to the admin panel via the SUN2000-HV19 inverter network .... etc. There was information that the software needs to be changed, the update went without a problem, the inverter fired again. It spreads its WiFi network to which the phone connects. Unfortunately, it is not possible to log into the inverter.
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    The application on the phone was updated - the problem persisted. I would like to add that before this procedure, Home Assistant connected with the inverter without any problems, now there is no connection with HA.
  • #619 19963123
    lizak1983
    Level 15  
    As it was an update to 140, you can change from the administrator account to a newer or older version through the fusionsolar portal. The port for HA has changed to 6607, but in version 140 the communication is completely blocked.
  • #620 19963140
    andrzejewskikam
    Level 6  
    So only this way? I understand that it will not be possible without a phone to the installer?
  • #621 19963169
    lizak1983
    Level 15  
    You can also write to the huawei support, provide the serial numbers of the inverter and ask for the update to 141 or apparently already 142. You will not do anything alone without an installer account on the fusionsolar portal.
  • #622 19963851
    frogpl
    Level 12  
    You can ask someone to download the firmware from 2022-04-02 - V100R001C00SPC142 and from 2022-02-12 - DGV100R002C00SPC109, and put it on the forum.
  • #623 19963872
    strucel
    Level 36  
    lizak1983 wrote:
    As it was an update to 140, you can change from the administrator account to a newer or older version through the fusionsolar portal. The port for HA has changed to 6607, but in version 140 the communication is completely blocked.

    Well, not completely complete, because rs485 still works in this case, using a smartlogger, you can update the inverter firmware via rs485, so you can probably update the firmware offline, unfortunately the Huawei modbus protocol description is silent in this topic, so you would have to have a smartlogger and listen to the transmission to get some sensible requests within a reasonable time.
  • #624 19963922
    andrzejewskikam
    Level 6  
    lizak1983 wrote:
    You can also write to the Huawei support, provide the serial numbers of the inverter and ask for the update to 141 or apparently already 142. You will not do anything alone without an installer account on the fusionsolar portal.

    Support helped, they downloaded new software remotely and there is no problem
  • #625 19966948
    TomiF19
    Level 10  
    Have they uploaded the firmware with the 141 or 142 ending?
  • #626 19966960
    andrzejewskikam
    Level 6  
    TomiF19 wrote:
    Have they uploaded the firmware with the 141 or 142 ending?

    141
  • #627 19971168
    xszuflax
    Level 11  
    Hi,

    after installing V100R001C00SPC142, have you noticed more frequent trips of the inverter and higher voltages on all phases (one is due to the other).

    From Wednesday, April 6, 2022, I have a problem with shutdowns, interestingly, the weather in the vicinity of Wrocław is rather poor (rain, clouds) and the production fluctuates in the range of 1 - 4 KWh with an installation of 6.4 KWp.

    Two things happened on Wednesday, I did an update to 142. On that day, Tauron was messing around with the medium / high voltage transformer on my street. I have already written to Tauron but I am wondering about the FW aspect of the inverter.

    I would like to add that there were no new connections for photovoltaic installations in the area and, in fact, the environment has not changed.

    Regards,
    Marcin
  • #628 19971367
    karol4000
    Level 12  
    xszuflax wrote:
    Hi,

    after installing V100R001C00SPC142, have you noticed more frequent trips of the inverter and higher voltages on all phases (one is due to the other).

    From Wednesday, April 6, 2022, I have a problem with shutdowns, interestingly, the weather in the vicinity of Wrocław is rather poor (rain, clouds) and the production fluctuates in the range of 1 - 4 KWh with an installation of 6.4 KWp.

    Two things happened on Wednesday, I did an update to 142. On that day, Tauron was messing around with the medium / high voltage transformer on my street. I have already written to Tauron but I am wondering about the FW aspect of the inverter.

    I would like to add that there were no new connections for photovoltaic installations in the area and, in fact, the environment has not changed.

    Regards,
    Marcin


    100% Tauron changed tensions to trafo. After updating, the voltage is the same as before
  • #629 19971738
    szczukot
    Level 14  
    Disconnect the inverter and check the grid voltage - and you know the answer.
    And to be sure, measure how dark it is and how sunny - do any installations in the network affect this voltage, etc.
  • #630 19974673
    szczukot
    Level 14  
    Such a question: I have a 7.1 kW installation.
    On days like today (i.e. generally sunny) in the app via the website, it shows me that I achieve as much as 8kW.
    Panels located around 40 degrees, south, but is it not an exaggeration? Why is it showing so much?

    Phantom

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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