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

Bob271 430422 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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  • #181 19382641
    stratus84
    Level 10  
    decklen wrote:
    Fusion Solar 7.0

    Thanks for the answer and the link, I will test myself, but I'm curious that in the Huawei store there is v2.6.6 which I use and here is v7?
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  • #182 19382835
    decklen
    Level 13  
    And 2.6.6 works for you, because since April 13, 21 it shows nothing. :(
  • #183 19384029
    elvis17elvis
    Level 2  
    decklen wrote:
    Fusion Solar 7.0


    I think there will be a new version available tomorrow
  • #184 19384474
    stratus84
    Level 10  
    decklen wrote:
    and the department you are 2,6,6? because he hasn't shown me anything since April 13

    Since their server update, it works once or more often ... It is bad, very bad, I have a Zamel MEW01 sub-meter connected to the whole house and I can see what is happening with production, i.e. overproduction, because this meter works a bit differently.
  • #185 19384672
    decklen
    Level 13  
    stratus84 wrote:
    decklen wrote:
    and the department you are 2,6,6? because he hasn't shown me anything since April 13

    Since their server update, it works once or more often ... It is bad, very bad, I have a Zamel MEW01 sub-meter connected to the whole house and I can see what is happening with production, i.e. overproduction, because this meter works a bit differently.


    Is it worth wearing? So that the energy supplier does not cheat?
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  • #186 19384698
    stratus84
    Level 10  
    decklen wrote:
    Is it worth wearing? So that the energy supplier does not cheat?

    Overall, it works very well, you need to update the software from time to time. It's best to look for more information on YouTube or read the Supla forum. Zamel MEW01 is counting exactly, few options are missing but the project is developing.
  • #187 19385236
    Math13
    Level 14  
    stratus84 wrote:
    decklen wrote:
    Mi updated to 133 as I used the app in version 7.0


    I was able to update to v133 using the SUN2000 v3.2 app, but I downloaded the soft software manually from the link in this topic and manually updated it. What is this apk that you have attached? Recently, there was information that they were supposed to work with the servers, I thought that Fusion Solar would start working normally, but unfortunately, as there were problems, they still remain ...


    Where did the v3.2 version come from ?!
    I have SUN2000 v.2.2 and newer is nowhere to be downloaded. Unfortunately, this version cannot be combined with the inverter. :-(
  • #188 19385770
    stratus84
    Level 10  
    Math13 wrote:
    Where did the v3.2 version come from ?!
    I have SUN2000 v.2.2 and newer is nowhere to be downloaded. Unfortunately, this version cannot be combined with the inverter.

    You need to install AppGallery - Huawei store, you will not find on Google because Huawei has flew out, political affairs of the USA & China.
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
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  • #189 19386137
    maneks
    Level 12  
    Welcome
    Did you manage to get the subject?
    In my case, after a whole day of fighting - because he theoretically detected the dongle, but he saw all networks as open and it was impossible to connect to any network - only the open one. Only installing the latest version of FusionSolar solved the problem.
    At the same time, I have a "fresh" SUN2000-8KTL-M1 inverter with a warranty up to 09/14/2031 !!! Theoretically, the warranty starts only in six months

    best regards
    m.

    kazkyy wrote:
    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.
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
  • #190 19386555
    stratus84
    Level 10  
    decklen wrote:
    Fusion Solar 7.0

    I installed this app from your file attachment, it looks a little different from the one from the Huawei AppGallery store. Where did you get this file, where to look for it to update it in the future? So far, I can't connect to the inverter anyway, probably servers again ..
  • #191 19387225
    Math13
    Level 14  
    stratus84 wrote:
    Math13 wrote:
    Where did the v3.2 version come from ?!
    I have SUN2000 v.2.2 and newer is nowhere to be downloaded. Unfortunately, this version cannot be combined with the inverter.

    You need to install AppGallery - Huawei store, you will not find on Google because Huawei has flew out, political affairs of the USA & China.


    Thanks. After considerable hardship, because I am not an eagle in the subject, (QR codes, Apki, etc.) was downloaded from the Huawei store, installed, connected to the inverter, and even from the machine asked for an inverter update and performed. :-) :-)

    Added after 5 [minutes]:

    I also have a request, because I can see that you write about the guarantee and that you can check it somewhere.
    Will someone suggest how to check the warranty? Yes, step by step. Please.
  • #193 19389162
    speedy9
    Helpful for users  
    Math13 wrote:
    stratus84 wrote:
    Math13 wrote:
    Where did the v3.2 version come from ?!
    I have SUN2000 v.2.2 and newer is nowhere to be downloaded. Unfortunately, this version cannot be combined with the inverter.

    You need to install AppGallery - Huawei store, you will not find on Google because Huawei has flew out, political affairs of the USA & China.


    Thanks. After considerable hardship, because I am not an eagle in the subject, (QR codes, Apki, etc.) was downloaded from the Huawei store, installed, connected to the inverter, and even from the machine asked for an inverter update and performed. :-) :-)

    Added after 5 [minutes]:

    I also have a request, because I can see that you write about the guarantee and that you can check it somewhere.
    Will someone suggest how to check the warranty? Yes, step by step. Please.

    No need to install Huawei store, just download the SUN2000 apk from this link: https://solar.huawei.com/~/media/Solar/APP/SUN2000.apk
  • #194 19394736
    jedreo
    Level 11  
    Hi,

    For a week now, I have had a problem logging into the FusionSolar application and the generated kiosk. However, I noticed that the problem does not occur when I have a VPN set up.
    So from my home internet (LTE), when it pings 90.84.191.21, it gets a timeout.
    When I put together a VPN for Warsawa, ping works.

    To make it funnier, local ping doesn't work, but tracert does.

    Do you have any idea what is wrong? It looks like some FireWall in the Orange network is blocking me.

    Ps. I also tested on LTE from the phone and on LTE from my friend from the same city.

    Maybe the blocking of Huawei's servers has started?
  • #195 19396233
    dprzyb
    Level 22  
    A new version of the software has appeared - SPC134.
    Rather, it does not bring anything interesting, but I throw it for those interested.
    Attachments:
    • SUN2000MA V100R001C00SPC134 Release Documents.zip (3.71 MB) You must be logged in to download this attachment.
    • SUN2000MAV100R001C00SPC134_package.zip (2.46 MB) You must be logged in to download this attachment.
  • #196 19396267
    speedy9
    Helpful for users  
    Yes, I looked at it today too. Rather interesting for people who have an energy storage.
  • #197 19396372
    stratus84
    Level 10  
    dprzyb wrote:
    A new version of the software has appeared - SPC134.

    And I have a question, why is my Sun2000 app unable to see updates? I even forced the last 133, so that I copied the file to the place where the app keeps updates before logging in, but after turning it on because normally the application deleted this file, the last one in this folder, if I'm not mistaken, is 126 which was automatically downloaded. There has been silence since then when it comes to automatic update detection.
  • #198 19396517
    decklen
    Level 13  
    But who needs this Sun2000 if it is always included in the latest version in FusionSolar ???
  • #199 19396559
    rokbok
    Level 39  
    decklen wrote:
    But who needs this Sun2000


    For example, when there are problems with logging in, communication with Fusion Solar, and this has been happening for a long time, using SUN 2000 you can log in directly to the inverter and check this and that, it's easier than the same, but with Fusion Solar.
  • #200 19396761
    dprzyb
    Level 22  
    stratus84 wrote:
    And I have a question, why is my Sun2000 app unable to see updates? I even forced the last 133, so that I copied the file to the place where the app keeps updates before logging in, but after turning it on because normally the application deleted this file, the last one in this folder, if I'm not mistaken, is 126 which was automatically downloaded. There has been silence since then when it comes to automatic update detection.

    I will not answer you. My inverter still has the SPC126 soft version and it does not report any updates. I feel a lot of discomfort before forcefully installing updates while normal mode cannot see them. This must be happening for a reason ...
  • #201 19397007
    decklen
    Level 13  
    rokbok wrote:
    decklen wrote:
    But who needs this Sun2000


    For example, when there are problems with logging in, communication with Fusion Solar, and this has been happening for a long time, using SUN 2000 you can log in directly to the inverter and check this and that, it's easier than the same, but with Fusion Solar.


    But after all, Sun2000 is implemented in FusionSolar !!!! And always in the latest version.

    Added after 2 [minutes]:

    dprzyb wrote:
    stratus84 wrote:
    And I have a question, why is my Sun2000 app unable to see updates? I even forced the last 133, so that I copied the file to the place where the app keeps updates before logging in, but after turning it on because normally the application deleted this file, the last one in this folder, if I'm not mistaken, is 126 which was automatically downloaded. There has been silence since then when it comes to automatic update detection.

    I will not answer you. My inverter still has the SPC126 soft version and it does not report any updates. I feel a lot of discomfort before forcefully installing updates while normal mode cannot see them. This must be happening for a reason ...

    And which version of Fusionsolar are you using? If the newest one, it forces the download and installation of the inverter firmware.
  • #202 19397287
    rokbok
    Level 39  
    decklen wrote:
    But after all, Sun2000 is implemented in FusionSolar !!!! And always in the latest version.


    Try to log in to Fusion Solar now, the old "yellow" or the new "blue", you will find out why you should have SUN 2000, this will be the best case until 8:00 April 26, 2021, and maybe the end of April ;) .

    decklen wrote:
    Sun2000 is implemented in FusionSolar


    Yes, in the newer "blue" version, and we used the "yellow" version all the time, its latest version is 2.6.6, which was not there and logging into the inverter was a bit of a pain, now after updating the Huawei cloud / server there will be an app "blue" and possibly SUN 2000 will become redundant, but time will tell.
  • #203 19397357
    decklen
    Level 13  
    rokbok wrote:
    decklen wrote:
    But after all, Sun2000 is implemented in FusionSolar !!!! And always in the latest version.


    Try to log in to Fusion Solar now, the old "yellow" or the new "blue", you will find out why you should have SUN 2000, this will be the best case until 8:00 April 26, 2021, and maybe the end of April ;) .

    decklen wrote:
    Sun2000 is implemented in FusionSolar


    Yes, in the newer "blue" version, and we used the "yellow" version all the time, its latest version is 2.6.6, which was not there and logging into the inverter was a bit of a pain, now after updating the Huawei cloud / server there will be an app "blue" and possibly SUN 2000 will become redundant, but time will tell.


    You are writing foolish things !!! Sun has always been in Fusionsolar, be it yellow or blue. Turn off the cellular network and turn on the inverter wifi and you have SUN2000 in the latest version !!!! No matter if you do it in version 2.6.6 or in version 2.7.0
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  • #204 19397534
    rokbok
    Level 39  
    decklen wrote:
    You are writing foolish things !!! Sun has always been in Fusionsolar, be it yellow or blue. Turn off the cellular network and turn on the inverter wifi and you have SUN2000 in the latest version !!!!


    I will not "kick with the horse", if you read what I wrote earlier and not only in this topic, maybe you would come to the right conclusions.
    Logging into the inverter from the "yellow" app was so annoying and not convenient that the alternative was SUN 2000 or Fusion Home, so much for the topic.

    For example, this entry.

    rokbok wrote:
    dprzyb wrote:
    Where are the inverter options?

    Go to the inverter and try like this:

    1. Log out of FusionSolar
    2. Turn off data transmission on your smartphone
    3. Find the inverter WiFi network on your smartphone and connect to it (you have the SSID on the side of the inverter)
    4. Click in the top right corner of the FusionSolar login screen (three dots)
    5. Select "Putting the device into operation"
    6. Scan the QR code on the side of the inverter
    7 Enter the password: 00000a and you are in the settings.

    If the fitter has changed the password to the inverter, you will do nothing if he does not give you the current one.


    Maybe also write how you can read your production these days without needing SUN 2000 or Fusion Home?
  • #205 19398084
    decklen
    Level 13  
    rokbok wrote:
    decklen wrote:
    You are writing foolish things !!! Sun has always been in Fusionsolar, be it yellow or blue. Turn off the cellular network and turn on the inverter wifi and you have SUN2000 in the latest version !!!!


    I will not "kick with the horse", if you read what I wrote earlier and not only in this topic, maybe you would come to the right conclusions.
    Logging into the inverter from the "yellow" app was so annoying and not convenient that the alternative was SUN 2000 or Fusion Home, so much for the topic.

    For example, this entry.

    rokbok wrote:
    dprzyb wrote:
    Where are the inverter options?

    Go to the inverter and try like this:

    1. Log out of FusionSolar
    2. Turn off data transmission on your smartphone
    3. Find the inverter WiFi network on your smartphone and connect to it (you have the SSID on the side of the inverter)
    4. Click in the top right corner of the FusionSolar login screen (three dots)
    5. Select "Putting the device into operation"
    6. Scan the QR code on the side of the inverter
    7 Enter the password: 00000a and you are in the settings.

    If the fitter has changed the password to the inverter, you will do nothing if he does not give you the current one.


    Maybe also write how you can read your production these days without needing SUN 2000 or Fusion Home?


    Using Sun2000 with Blue FusionSolar - what's something weird about that ???
    Only you do not need to scan anything like you did once before.
  • #206 19398113
    rokbok
    Level 39  
    decklen wrote:
    Using Sun2000 with Blue FusionSolar


    And that's the point, FS "blue" is not widely available, it is an app that will replace the old one after the server update by Huawei, it is not there, neither in the Huawei appGalery, nor in Google Play, although the insiders managed to do it.

    Until now, FS was "yellow" and logging in to the inverter with it was, to put it mildly speaking, very cumbersome, so the alternative was SUN 2000 or Fusion Home and I think that we should end the discussion here.
  • #207 19398195
    decklen
    Level 13  
    rokbok wrote:
    decklen wrote:
    Using Sun2000 with Blue FusionSolar


    And that's the point, FS "blue" is not widely available, it is an app that will replace the old one after the server update by Huawei, it is not there, neither in the Huawei appGalery, nor in Google Play, although the insiders managed to do it.

    Until now, FS was "yellow" and logging in to the inverter with it was, to put it mildly speaking, very cumbersome, so the alternative was SUN 2000 or Fusion Home and I think that we should end the discussion here.


    Why do you think so, after all, it is done in the same way with blue and yellow. There is no difference. Have you ever had a problem with the yellow entry from the installer level?
  • #208 19398350
    rokbok
    Level 39  
    decklen wrote:
    Why do you think so, after all, it is done in the same way with blue and yellow.


    I do not know how it worked on the yellow one, but I had to be within the WiFi range of the inverter to connect to it, you had to be logged out from the FS so that the option to put the device into use appeared, in SUN 2000 and Fusion Home it is enough to be within the range of home WiFi and that is a big difference.
    It was like that before SUN 2000 was added to the "yellow" app, logging in looked completely different than now, now it is enough to be within the range of home WiFi, and not within the WiFi range of the inverter, the description of what it looked like is in post # 32 on the second page of this thread.

    decklen wrote:
    Have you ever had a problem with the yellow entry from the installer level?


    No, I didn't, but it's about the annoyance of logging into the inverter from the "yellow" FS level and I'm trying to tell you all the time, so with "yellow", and so far it was the basic app to monitor and the only better solution was SUN 2000 or Fusion Home, see post # 32 on the second page of this thread.
  • #209 19398676
    decklen
    Level 13  
    rokbok wrote:
    decklen wrote:
    Why do you think so, after all, it is done in the same way with blue and yellow.


    I do not know how it worked on the yellow one, but I had to be within the WiFi range of the inverter to connect to it, you had to be logged out from the FS so that the option to put the device into use appeared, in SUN 2000 and Fusion Home it is enough to be within the range of home WiFi and that is a big difference.
    It was like that before SUN 2000 was added to the "yellow" app, logging in looked completely different than now, now it is enough to be within the range of home WiFi, and not within the WiFi range of the inverter, the description of what it looked like is in post # 32 on the second page of this thread.

    decklen wrote:
    Have you ever had a problem with the yellow entry from the installer level?


    No, I didn't, but it's about the annoyance of logging into the inverter from the "yellow" FS level and I'm trying to tell you all the time, so with "yellow", and so far it was the basic app to monitor and the only better solution was SUN 2000 or Fusion Home, see post # 32 on the second page of this thread.

    OKAY :)
  • #210 19401544
    wydmy
    Level 11  
    rokbok wrote:

    I do not know how it worked on the yellow one, but I had to be within the WiFi range of the inverter to connect to it, you had to be logged out from the FS so that the option to put the device into use appeared, in SUN 2000 and Fusion Home it is enough to be within the range of home WiFi and that is a big difference.
    It was like that before SUN 2000 was added to the "yellow" app, logging in looked completely different than now, now it is enough to be within the range of home WiFi, and not within the WiFi range of the inverter, the description of what it looked like is in post # 32 on the second page of this thread.


    Could you describe how to connect to the inverter via home WiFi? Both the SUN2000 and Fusion Home want to connect only through the inverter access point. I can only connect to the dongler via home WiFi.
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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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