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

Bob271 430416 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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  • #811 20051113
    rutekjery
    Level 7  
    Well, however, there must be 3 sockets, each on one phase. Installing one socket on one phase only protects you against voltage surges on this particular phase, which in turn may cause the inverter to switch off multiple times due to voltage increases on the other two phases where there is no such socket.
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  • #812 20051187
    szczukot
    Level 14  
    Well, no exaggeration. And this is how a row of 250V is set up. If by some miracle there is less on 2 phases and more than 253V on one, then something is grossly wrong.
  • #813 20051198
    xszuflax
    Level 11  
    szczukot wrote:
    Well, no exaggeration. And this is how a row of 250V is set up. If by some miracle there is less on 2 phases and more than 253V on one, then something is grossly wrong.


    I have already seen 7V differences between loaded phase and those without load. This is the inverter reading, but in the end it is he who decides when to shut off. I would like to add that with normal day and night use, the differences are ~ 1V, but when the 7KW multi split is activated (I know that it does not consume 7KW, only maybe 2 - 2.5), these are the differences.
  • #814 20053818
    qrko
    Level 14  
    7V? With us, it reaches 17 in the temporal differences.
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
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  • #815 20053831
    xszuflax
    Level 11  
    qrko wrote:
    7V? With us, it reaches 17 in the temporal differences.


    I once sent such a video here https://www.youtube.com/watch?v=38cv6WXsL-A. 17V is a lot, maybe it is worth pinching the wires. It won't hurt, and maybe you'll lower the tensions.
  • #816 20053856
    qrko
    Level 14  
    12 PV installations on the street, the same for everyone :)
  • #817 20053903
    rokbok
    Level 39  
    In 3F installations, the phases should be fairly evenly loaded, the problem is that in home installations it is difficult to achieve, unless someone has already anticipated it at the stage of building the house and has distributed the electrical installation properly.
    However, this also does not guarantee the intended purpose, power hungry devices are usually used at different times of the day.

    The second thing is that such an even load of phases would have to have other recipients connected to the same transformer, and this is even more difficult, here the circle is closed ;) .
  • #818 20054273
    rafaelb
    Level 12  
    domelek wrote:

    And I added additional cooling, we will see what impact it has on the efficiency of the inverter, I will test, because I can make a temp vs efficiency graph ...
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Did you give a thermostat or is it going 24h?

    Any insights? Is it better?
  • #819 20054322
    szczukot
    Level 14  
    One of the reasons why I chose Huawei was that it has passive cooling.
    So I'm not really getting ready to add fans.

    Well, unless it turns out that little electricity is generated because it overheats a lot.
    When creating the installation, I calculated the following: from 7.1 kW I will get 7.1 MWh per year.
    A year passes in 30 days. I have 6.0 MWh currently generated.
    So if I get an average of 30 kWh per day for the next 30 days, I will get exactly as much as I wanted. Literally + - 1% will come out ;)

    I consume about 5.0 MWh, but with an air-conditioning system it will be around 5.5 - 6.0 MWh.
    So even in the worst case, if I only use electricity at night, I will have 5.7 MWh of this 7.1 MWh.
  • #820 20054538
    domelek
    Level 17  
    rafaelb wrote:
    domelek wrote:

    And I added additional cooling, we will see what impact it has on the efficiency of the inverter, I will test, because I can make a temp vs efficiency graph ...
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Did you give a thermostat or is it going 24h?

    Any insights? Is better?


    The fans turn on when the inverter temperature is> 40C, so far there has been no great heat, the maximum temperature I recorded is 58C. Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
  • #821 20064141
    macif
    Level 3  
    Anyone know how to set it to Polish conditions? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    I saw various instructions for America, but I did not find one for Poland.
  • #822 20064505
    domelek
    Level 17  
    macif wrote:
    Anyone know how to set it to Polish conditions? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    I saw various instructions for America, but I did not find one for Poland.

    Here are the requirement for e.g. Tauron (but the rest are similar or identical)
    Attachments:
    • ZBIOR-WYMAGAN-DLA-MODULOW-WYTWARZANIA-ENERGII-TYPU-A-W-TYM-MIKROINSTALACJI.pdf (1.06 MB) You must be logged in to download this attachment.
  • #823 20066421
    macif
    Level 3  
    Anyone know what they called the "Voltage Suppression Function" functions in the SUN2000 and the latest 145 firmware? My inverter turns off because of too high voltage, and I found such a function in the old inverter manuals
  • #824 20066510
    domelek
    Level 17  
    The newest translations from Chinese are 'buy se heater', older translations say, 'call osd', the rest about kant du..y se can be broken.
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  • #825 20066680
    qrko
    Level 14  
    I am 145 and it has the same name. It works quite nice, the production is lowered, but not as much as 10 inverter shutdowns. I set it above 253V to drop production to 25 percent. Yesterday, the lamp all day and not a single shutdown.
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
  • #826 20066785
    xszuflax
    Level 11  
    macif wrote:
    Anyone know how to set it to Polish conditions? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Hi,

    I also connect to the question. The BB PV article cited earlier Link suggests that you leave these settings unchanged.

    Guidelines Tauron's document in point 8.3 actually specifies the values of the Q (U) characteristic, but the values and the scale on the Y axis do not coincide. There are also percentages to set.

    Maybe someone figured it out?
  • #827 20067024
    domelek
    Level 17  
    xszuflax wrote:
    macif wrote:
    Anyone know how to set it to Polish conditions? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Hi,

    I also connect to the question. The BB PV article cited earlier Link suggests that you leave these settings unchanged.

    Guidelines Tauron's document in point 8.3 actually specifies the values of the Q (U) characteristic, but the values and the scale on the Y axis do not coincide. There are also percentages to set.

    Maybe someone figured it out?


    Maybe post # 245 will help?
  • #828 20067101
    macif
    Level 3  
    qrko wrote:
    I am 145 and it has the same name. It works quite nice, the production is lowered, but not as much as 10 inverter shutdowns. I set it above 253V to drop production to 25 percent. Yesterday, the lamp all day and not a single shutdown.
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Do you have "Voltage Suppression" enabled? If so, you can show where it is, but by logging directly to the inverter? I don't have an installer account via www. Frying pan today and the voltage jumps again on the third phase ....: /
  • #829 20067137
    xszuflax
    Level 11  
    domelek wrote:
    xszuflax wrote:
    macif wrote:
    Anyone know how to set it to Polish conditions? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Hi,

    I also connect to the question. The BB PV article cited earlier Link suggests that you leave these settings unchanged.

    Guidelines Tauron's document in point 8.3 actually specifies the values of the Q (U) characteristic, but the values and the scale on the Y axis do not coincide. There are also percentages to set.

    Maybe someone figured it out?


    Maybe post # 245 will help?


    And the master because according to the post # 245 The default data is in line with Tauron's requirements. Which was already suggested by the link from BB PV Link
  • #830 20067325
    qrko
    Level 14  
    macif wrote:
    qrko wrote:
    I am 145 and it has the same name. It works quite nice, the production is lowered, but not as much as 10 inverter shutdowns. I set it above 253V to drop production to 25 percent. Yesterday, the lamp all day and not a single shutdown.
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar


    Do you have "Voltage Suppression" enabled? If so, you can show where it is, but by logging directly to the inverter? I don't have an installer account via www. Frying pan today and the voltage jumps again on the third phase ....: /


    It is in 2 places, here is one of them. I don't remember the second one and I'm away from home. Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
  • #831 20086022
    arkadiusz.rostkowski
    Level 2  
    Good day.
    I have read all the posts but I have not found a solution. I purchased a sun 2000 6kw. After half a year, I realized that it was too small and I bought a bigger one.
    The smaller one has been dismantled and I have a buyer, but the installer has not been able to come to me for a month and disconnect the inverter from the installation in the application.
    I have an installer account so I can do it myself but I don't know how. Maybe someone will help in a very good way and disconnect the inverter from the application myself. The customer cares about the purchase.
    Ps, do I have to connect the inverter to the installation or can it be removed virtually.

    Thanks a lot for your help and answer


    Regards
  • #832 20086060
    domelek
    Level 17  
    arkadiusz.rostkowski wrote:
    Good day.
    I have read all the posts but I have not found a solution. I purchased a sun 2000 6kw. After half a year, I realized that it was too small and I bought a bigger one.
    The smaller one has been dismantled and I have a buyer, but the installer has not been able to come to me for a month and disconnect the inverter from the installation in the application.
    I have an installer account so I can do it myself but I don't know how. Maybe someone will help in a very good way and disconnect the inverter from the application myself. The customer cares about the purchase.
    Ps do I have to connect the inverter to the installation or can it be virtually removed.

    Thanks a lot for your help and answer


    Regards

    You enter INSTALLATIONS, next to your installation, in the OPERATION column, click the edit icon (modify). Select the ADD DEVICES tab. Click on DELETE next to inverter / donglu. Then click APPLY and that's it ...
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  • #833 20099511
    JMZZ
    Level 5  
    kotbury wrote:
    Sun 10KW 3-phase (plus Luna battery) has no full island operation option at all. There is only a 1-phase backup with a power of 3 kW, led to a separate Box output from the L1 phase of the inverter and the inverter during daytime operation of this backup does not use panel loading at all and it only takes electricity from the battery.
    Only the 1-phase version offers a full island with solar charging.

    This is a distortion as to the lack of charging while working on the backup - I have recently had such a system and it just works. On a sunny day, the system works insularly off the grid, unfortunately only in one phase. However, it has many disadvantages, most of all it turns off with a load of 2-3 kW (and it should be able to withstand 5, because I have 2 batteries). And a terribly intricate change to default settings. Huawei should try better for this money.

    Added after 39 [seconds]:

    kotbury wrote:
    Sun 10KW 3-phase (plus Luna battery) has no full island operation option at all. There is only a 1-phase backup with a power of 3 kW, led to a separate Box output from the L1 phase of the inverter and the inverter during daytime operation of this backup does not use panel loading at all and it only takes electricity from the battery.
    Only the 1-phase version offers a full island with solar charging.

    This is a distortion as to the lack of charging while working on the backup - I have recently had such a system and it just works. On a sunny day, the system works insularly off the grid, unfortunately only in one phase. However, it has many disadvantages, most of all it turns off with a load of 2-3 kW (and it should be able to withstand 5, because I have 2 batteries). And a terribly intricate change to default settings. Huawei should try better for this money.
  • #834 20099733
    qrko
    Level 14  
    JMZZ wrote:
    I have such an arrangement recently

    Can you have a fusion solar screenshot on a clear day? I would like to see what it looks like on the chart.
  • #835 20100692
    Rowan
    Level 20  
    I have a question. Does the model, e.g. 4KTL, differ from 5KTL somehow physically? Is it possible to modify it somehow to increase power?
  • #836 20100768
    prose
    Level 36  
    @Rowan You won't convert that type to a sofar.
  • #837 20100816
    speedy9
    Helpful for users  
    Rowan wrote:
    Does the model, e.g. 4KTL, differ from 5KTL somehow physically? Is it possible to modify it somehow to increase power?

    Does it cut you tight? I have 4KTL and 5.5kWp panels and it cuts at 4.4kW.
  • #838 20100865
    JMZZ
    Level 5  
    qrko wrote:
    JMZZ wrote:
    I have just such an arrangement recently

    Can you have a fusion solar screenshot on a clear day? I would like to see what it looks like on the chart.

    No problem, I will test in a few days, but what graph are you asking specifically?
  • #839 20100871
    Rowan
    Level 20  
    speedy9 wrote:
    Rowan wrote:
    Does the model, for example 4KTL, differ from 5KTL somehow physically? Is it possible to modify it somehow to increase power?

    Does it cut you tight? I have 4KTL and 5.5kWp panels and it cuts at 4.4kW.

    It truns at 4.25 and the panels in this installation are 6.7.

    Or do you know what it is like in the Growatt series of the MOD series? Can the 8000TLX be made on the 9000TLX?
  • #840 20100877
    qrko
    Level 14  
    JMZZ wrote:
    qrko wrote:
    JMZZ wrote:
    I have such an arrangement recently

    Can you have a fusion solar screenshot on a clear day? I would like to see what it looks like on the chart.

    No problem, I will test in a few days, but what graph are you asking specifically?


    Just a set of production / loading / unloading / consumption graphs for an entire sunny day.
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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.

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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