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

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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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#121 19293974 03 Mar 2021 11:41

strucel strucel

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Post #121
19293974 03 Mar 2021 11:41

Math13 wrote:

domelek wrote:
You enter the Fusion Solar website. You log in and enter the settings at the very top. I think you can still do it ...

It's not very intuitive, but I managed it somehow.
You have to find the device yourself and the matching software.
I just still don't understand:
1) Why I didn't get the update from the machine like my colleague "mondo20001"
2) I do not see any software with the ending ... SPC126 on the list.
3) I can't see firmware newer than: V100R001C00SPC122

What inverter do you have? Until my latest version is the one marked by me, im going fast 130 came out in February as far as I can remember.
Other files are for other inverters, probably parts to those that do not exist in Europe, theoretically, the system should not give a bad one, but seeing how the Huawei is thrashing with the application, I would not risk it.
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#122 19294028 03 Mar 2021 12:17

Math13 Math13

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Post #122
19294028 03 Mar 2021 12:17

andrzej20001 wrote:
For me, the machine sucks up updates.

I don't and I don't understand why. :-(

Added after 7 [minutes]:

strucel wrote:
What inverter do you have?

I have both installations on identical inverters.
SUN2000-5KTL-M0

In the list (as I indicated earlier, in the search window) I also found updates for SDongleA-05.

How do you guys. Worth updating?
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#123 19294107 03 Mar 2021 12:42

kazkyy kazkyy

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Post #123
19294107 03 Mar 2021 12:42

Hi!
He has been trying to connect to the dongle in the inverter for a long time. The inverter model is sun2000-5ktl-m0 and for the gingerbread house I can't get the connection ...

I have an insight into how many panels are produced for me, but this USB dongle for the inverter is flashing red all the time and I have no idea how to connect to it, I think I've tried everything ... it's not the fault of the router ...
I connect to the application using my phone. As I wrote, I connect to the inverter normally, I already have my password for the installer and the user. I am asking for help, because my hands are dropping, how should I make the dongle online and the quick configuration will be successful with the working dongle.
#124 19294388 03 Mar 2021 15:02

domelek domelek

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Post #124
19294388 03 Mar 2021 15:02

Math13 wrote:

domelek wrote:
You enter the Fusion Solar website. You log in and enter the settings at the very top. I think you can still do it ...

It's not very intuitive, but I managed it somehow.
You have to find the device yourself and the matching software.
I just still don't understand:
1) Why I didn't get the update from the machine like my colleague "mondo20001"
2) I do not see any software with the ending ... SPC126 on the list.
3) I can't see firmware newer than: V100R001C00SPC122

The ending 133 is the newest (at the top in your screenshot)
#125 19294727 03 Mar 2021 17:54

andrzej20001 andrzej20001

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Post #125
19294727 03 Mar 2021 17:54

Today it went, updating the inverter on spc133 and dongle on spc118. But the second time they took off
#126 19295321 03 Mar 2021 21:15

Math13 Math13

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Post #126
19295321 03 Mar 2021 21:15

andrzej20001 wrote:
Today it went, updating the inverter on spc133 and dongle on spc118. But the second time they took off

Do these update bring any changes to the visual preview of the inverter operation, add any interesting options?
Is it just, for example, an improvement in the inverter operation and the ordinary user will not notice the changes?
I am asking because I hesitate to install manually, if both my inverters are not signaling and are not installing updates from the automatic machine. I am afraid not to spoil something, because the inverters on the old software seem to work well.
#127 19295396 03 Mar 2021 21:36

domelek domelek

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Post #127
19295396 03 Mar 2021 21:36

Math13 wrote:

andrzej20001 wrote:
Today it went, updating the inverter on spc133 and dongle on spc118. But the second time they took off

Do these update bring any changes to the visual preview of the inverter operation, add any interesting options?
Is it just, for example, an improvement in the inverter operation and the ordinary user will not notice the changes?
I am asking because I hesitate to install manually, if both my inverters are not signaling and are not installing updates from the automatic machine. I am afraid not to spoil something, because the inverters on the old software seem to work well.

In addition to the added grid code, the last one improves something with sending data to the server and more for the M1 series (batteries, optimization), the update takes about 20 minutes ...
#128 19301757 07 Mar 2021 02:51

AlaratH AlaratH

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Post #128
19301757 07 Mar 2021 02:51

Hello
SUN 2000 M1 inverter
During configuration, when choosing wifi, I cannot enter the password. I only choose the network and it is on, of course it does not connect. I only have the inscription under the network selection: the current method of connecting to the network is dangerous, change .., but nowhere do I see the possibility of changing the encryption.
#129 19302043 07 Mar 2021 11:15

rokbok rokbok

Level 39

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Post #129
19302043 07 Mar 2021 11:15

For me, there is a configuration screen as below, I do not know how it is with you.
#130 19302265 07 Mar 2021 12:44

lukkucz lukkucz

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Post #130
19302265 07 Mar 2021 12:44

The question is a bit different

I have a SUN2000-5KTL-M0 inverter, panels power 4.74kWp - to what maximum value I can extend the installation. I know it will be one or two panels, but I mean a specific value.

And the second thing I would like to have a preview like in the photo

I mean the load, how much energy do I use, give back etc. Probably something needs to be built, but what and how it is already beyond me
#131 19302424 07 Mar 2021 15:34

dprzyb dprzyb

Level 22

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Post #131
19302424 07 Mar 2021 15:34

You must have an energy meter in addition. The original one is Huawei DTSU666-H.
Somewhere on the Electrode there was a topic with the replacements given ...

Added after 1 [hours] 52 [minutes]:

You can force some update if I do not have the "Software update" tab available in Fusion Solar, and after logging in to the inverter directly with the app, it shows me "no update"?
At the moment I have SPC122 in inverter and SPC111 in donglu (SUN2000-4KTL-M0)
#132 19317700 14 Mar 2021 15:19

Math13 Math13

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Post #132
19317700 14 Mar 2021 15:19

I have a problem and I count on your help as always.
I accidentally clicked on the phone in wi-fi options, "forget network" for my connection to SUN2000-2050084xxxx
Now there is no way I can connect to the inverter with FusionHome and SUN2000.
I do not remember if I had to set the password personally during the first connection / installation or if it is a standard one.
Password: "00000a" is not accepted because it is too short.
What can the password be, or how to set a new one or recover the old one?

Currently, I can log into the inverter with the FusionSolar app by entering my email and password
Unfortunately, the above password is inappropriate to connect to the inverter via FusionHome or SUN2000.
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#133 19317808 14 Mar 2021 16:07

rokbok rokbok

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Post #133
19317808 14 Mar 2021 16:07

Math13 wrote:
I accidentally clicked on the phone in wi-fi options, "forget network" for my connection to SUN2000-2050084xxxx

This means that you have deleted the password needed for connection, go to the inverter and turn on the WiFi scan on the phone, when your SUN2000-2050084xxxx inverter pops up, click on it and enter the password provided on the side of the inverter.

Math13 wrote:
Password: "00000a" is not accepted because it is too short.

You use this password only when you have a visible inverter network on your phone and want to enter its options, of course, if someone has not changed this password before, the installer, maybe you.

How to enter the inverter options I described earlier, page 2 of this thread, post # 32.
#134 19318111 14 Mar 2021 18:16

Math13 Math13

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Post #134
19318111 14 Mar 2021 18:16

rokbok wrote:
This means that you have deleted the password needed for connection, go to the inverter and turn on the WiFi scan on the phone, when your SUN2000-2050084xxxx inverter pops up, click on it and enter the password provided on the side of the inverter.

Thanks. Managed to. The square code in no way wanted to read, but the password to the network was written in small letters. It worked.
FusionHome works. :-)

Out of curiosity, I also downloaded the SUN2000 app. On another thread of this form it was written that it also supposedly works with an inverter.
Unfortunately, it does not work for me. When selecting "Connection mode" and selecting the last "WLAN connection", it takes you to the network selection screen. After selecting and accepting "SUN2000-HV20500xxxxx, it connects to it (as does FusionHome). But nothing else can be done, because this app stays in the network selection window and you can't go back to this SUN2000 window to enter other parameters ( ie "Common user" and enter "password").
Anyone using the SUN2000 app with a Huawei inverter? Does it work for you?
#135 19318130 14 Mar 2021 18:22

rokbok rokbok

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Post #135
19318130 14 Mar 2021 18:22

Math13 wrote:
Anyone use a SUN2000 cap with a Huawei inverter? Does it work for you?

It doesn't work for me either, it's better to install FusionHome, it's better to enter the inverter options than through FusionSolar.
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#136 19318151 14 Mar 2021 18:31

Math13 Math13

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Post #136
19318151 14 Mar 2021 18:31

rokbok wrote:

Math13 wrote:
Anyone use a SUN2000 cap with a Huawei inverter? Does it work for you?

It doesn't work for me either, it's better to install FusionHome, it's better to enter the inverter options than through FusionSolar.

Thanks. I also have both FusionHome and FusionSolar.
You're right. At home, I actually enjoy FH better. I use FS only as an app to control and preview away from home.
#137 19319061 15 Mar 2021 07:55

dprzyb dprzyb

Level 22

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Post #137
19319061 15 Mar 2021 07:55

dprzyb wrote:
You can force some update if I do not have the "Software update" tab available in Fusion Solar, and after logging in to the inverter directly with the app, it shows me "no update"?
At the moment I have SPC122 in inverter and SPC111 in donglu (SUN2000-4KTL-M0)

Someone something?
#138 19319338 15 Mar 2021 10:34

domelek domelek

Level 17

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Post #138
19319338 15 Mar 2021 10:34

dprzyb wrote:

dprzyb wrote:
You can force some update if I do not have the "Software update" tab available in Fusion Solar, and after logging in to the inverter directly with the app, it shows me "no update"?
At the moment I have SPC122 in inverter and SPC111 in donglu (SUN2000-4KTL-M0)

Someone something?

See post 121, how do you have no update option, maybe you do not have permission?
#139 19319387 15 Mar 2021 11:01

dprzyb dprzyb

Level 22

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Post #139
19319387 15 Mar 2021 11:01

Exactly. I do not have the option to update on the FusionSolar website, probably due to lack of permissions. Therefore, I am asking how to get around it.
I have an update option in the app but I write that there is no newer version.
Can you manually download this version of SPC133 from somewhere?
#140 19319794 15 Mar 2021 14:35

rokbok rokbok

Level 39

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Post #140
19319794 15 Mar 2021 14:35

dprzyb wrote:
Can you manually download this version of SPC133 from somewhere?

Yes, from the huawei website, registration required, link below.

https://support.huawei.com/enterprise/en/digital-power/sun2000ma-pid-22755755/software

dprzyb wrote:
after logging in directly to the inverter, the app shows me "no update"?
Someone something?

For me, there is an option to select the file manually, but you need to physically have it, e.g. on a smartphone, see below.
#141 19320558 15 Mar 2021 19:54

domelek domelek

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Post #141
19320558 15 Mar 2021 19:54

In the appendix to the 3-phase version:
Applicable to SUN2000-3KTL-M0, SUN2000-4KTL-M0, SUN2000-5KTL-M0, SUN2000-6KTL-M0, SUN2000-8KTL-M0, SUN2000-10KTL-M0, SUN2000-12KTL-M0, SUN2000-15KTL-M0, SUN2000-17KTL-M0, SUN2000-20KTL-M0, SUN2000-3KTL-M1, SUN2000-4KTL-M1, SUN2000-5KTL-M1, SUN2000-6KTL-M1, SUN2000-8KTL-M1, SUN2000-10KTL-M1, SUN2000- 8KTL-M2, SUN2000-10KTL-M2, SUN2000-12KTL-M2, SUN2000-15KTL-M2, SUN2000-17KTL-M2, SUN2000-20KTL-M2

Attachments:

SUN2000MAV100R001C00SPC133_package.zip (2.43 MB) You must be logged in to download this attachment.
#142 19320577 15 Mar 2021 20:01

rokbok rokbok

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Post #142
19320577 15 Mar 2021 20:01

domelek wrote:
In the appendix to the 3-phase version:

You registered on the Huawei website, or the file in the attachment from another source, it is just out of curiosity whether it is worth registering there.
#143 19320584 15 Mar 2021 20:05

domelek domelek

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Post #143
19320584 15 Mar 2021 20:05

rokbok wrote:

domelek wrote:
In the appendix to the 3-phase version:

You registered on the Huawei website, or the file in the attachment from another source, it is just out of curiosity whether it is worth registering there.

The file straight from Huawei's website, the registration takes a while before they approve you, it took me about a week ...
#144 19321172 16 Mar 2021 08:02

Yahoou77 Yahoou77

Level 12

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Post #144
19321172 16 Mar 2021 08:02

Math13 wrote:

Anyone using the SUN2000 app with a Huawei inverter? Does it work for you?

I use the SUN2000 app to support my SUN2000-5ktl-m1 and I really appreciate its performance. The only flaw is that it does not remember the login password and you have to stick your finger in it every time.

And a question for installers who have the configuration of Huawei inverters at their fingertips:
How should the parameter "PID operation mode" be optimally set (marked in the photo below)? There are two options: "disable" and "repair". I have a Sun2000-5ktl-m1 to which 2 chains (12 + 7) of JaSolar jam60s10-340 / mr panels are connected, without optimizers, because there is no risk of shading.
By default, the installer has disabled this feature. Is this a good approach? If not, what are the benefits / inconveniences of changing this option to "repair"?
I will be grateful for your response...
#145 19332357 21 Mar 2021 14:43

ŁukaszD ŁukaszD

Level 1

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Post #145
19332357 21 Mar 2021 14:43

AlaratH wrote:
Hello
SUN 2000 M1 inverter
During configuration, when choosing wifi, I cannot enter the password. I only choose the network and it is on, of course it does not connect. I only have the inscription under the network selection: the current method of connecting to the network is dangerous, change .., but nowhere do I see the possibility of changing the encryption.

Hello. Did you manage to solve the problem you wrote about? I have the same, I cannot connect the SUN2000-6KTL-M1 inverter to the home WIFI network, there is no field to enter the password, and the information "the current method of connecting to the network is dangerous ...". After selecting a network from the list, it reaches 20% and throws an error. The same errors when trying to connect to another router and when using the TP-LINK TL-WA855RE repeater. If I connect the TP-LINK TL-WA855RE amplifier with the Dongle with a LAN cable, everything works fine. WIFI encryption is WPA / WPA2. Best regards.
#146 19334701 22 Mar 2021 14:40

robert14-83 robert14-83

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Post #146
19334701 22 Mar 2021 14:40

For me, the power of the panels is 5.22kWp and the Huawei SUN2000-4KTL-M0 inverter. I noticed that in sunny weather, the maximum instantaneous gain is 4400W of the inverter output power. More will not "push out". Is it not capable of handling more power?
#147 19335372 22 Mar 2021 19:37

domelek domelek

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Post #147
19335372 22 Mar 2021 19:37

robert14-83 wrote:
For me, the power of the panels is 5.22kWp and the Huawei SUN2000-4KTL-M0 inverter. I noticed that in sunny weather, the maximum instantaneous gain is 4400W of the inverter output power. More will not "push out". Is it not capable of handling more power?

NO max is 4.4 at cos phi = 1
#148 19344399 27 Mar 2021 12:12

Domian456 Domian456

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Post #148
19344399 27 Mar 2021 12:12

Hello...
This morning the Smart Dongle LED started flashing red ... So far, everything was ok ... Can't connect to the Internet ... I reset the router and nothing has any effect ...
I can not enter the inverter settings because where is the password on the sticker next to the inverter ... Because I can not find ...
Thank you in advance for your help...
#149 19344405 27 Mar 2021 12:16

topic_vw topic_vw

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Post #149
19344405 27 Mar 2021 12:16

A global problem, I think everyone has it. I'm used to these fucups now
#150 19344421 27 Mar 2021 12:28

Domian456 Domian456

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Post #150
19344421 27 Mar 2021 12:28

So what should I wait for it to graciously connect itself ... It is unknown when ...

Added after 6 [minutes]:

rokbok wrote:

This means that you have deleted the password needed for connection, go to the inverter and turn on the WiFi scan on the phone, when your SUN2000-2050084xxxx inverter pops up, click on it and enter the password provided on the side of the inverter.

Where is the password written on the sticker ... Or as signed ...
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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?

On the router set the new SSID and password identical to the old ones – the inverter reconnects automatically [Elektroda, lizak1983, post #19657944]
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

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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