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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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  • #1051 20520110
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    >>20520074

    Thanks for all the information. It seems that the configuration is ok. Now it will be a bit more difficult. You can specify what devices you have at home that consume more than 2kW. I mean the boiler (boiler), heat pump (heat pump), air conditioner (air conditioner), electric kettle (electric kettle).
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  • #1052 20520118
    oliverco
    Level 4  
    Posts: 7
    It's our new house so just an oven in the kitchen, a washing machine and for now we're using air heaters. Also, I have about 200W consumption at night from backup devices, router, alarms, cameras, etc. The strange thing is that I never had 0 from the mains.
  • #1053 20520165
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    You have a KTL6-L1 LUNA2000 inverter. This can generate 2.5kW of instantaneous energy. So if connected to a 2kW heater, everything goes ok with LUNA. But if you turn on the 4kW heater, then 2.5kW from Luna 1.5kW from the mains. So if all the radiators are running at the same time you will still be using the mains even though you have a charged battery, there are some solutions to this but they require additional devices.

    oliverco wrote:
    The strange thing is that I never had 0 from the net
    This puzzles me greatly. What kind of installations do you have in your house L, or L1, L2, L3?
  • #1054 20520170
    oliverco
    Level 4  
    Posts: 7
    one phase :)

    Added after 8 [minutes]:

    >>20520165
    I'm sure when I send electricity to the grid it will solve the problem, but I can't. I thought there was some setting to limit this, but I can't find it. So a possible solution would be off grid Island. Here, even when I use 70 kW per month, it is PLN 600
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  • #1055 20520220
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    I'm afraid it won't solve it. Your installation requires a more thorough analysis. I'll contact you on priv because a big off-topic has happened.
  • #1056 20526118
    gitpusher
    Level 12  
    Posts: 50
    Help: 1
    Rate: 7
    velkhor wrote:
    Gentlemen, I think I need some clarification.
    in HA there is "Startup Time" and "Shutdown Time", unfortunately translated into Polish was wonderfully as switching on and off the inverter. This is the switching on and off of the inverter producing electricity. The inverter cannot be turned off in any software way. Even the slider you have in fusion solar turns this inverter on and off. (of course we are talking about the EU version because the Chinese is completely off)


    But who translated it like that?
    because from what I can see there is no Polish translation:
    https://github.com/wlcrs/huawei_solar/tree/main/translations

    ps. among others That's why I always use English whenever I can :)
  • #1057 20526278
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    gitpusher wrote:
    But who translated it like that?

    Huawei on the web and on the app ;)
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    And there is no official translation plugin.
  • #1058 20526290
    rokbok
    Level 39  
    Posts: 4222
    Help: 617
    Rate: 983
    These times of switching on and off the inverter are in fact the beginning and end of energy production, i.e. when there is sufficient voltage from the panels and appropriate weather conditions, the inverter turns on, when there are not enough of these two factors, the inverter stops producing, which is described as turning it off.

    In other words, the beginning and end of energy production on a given day.
  • #1059 20526678
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    rokbok wrote:
    In other words, the beginning and end of energy production on a given day.


    Do you fucking read what people write or are you just writing to write something...
    This is exactly what I wrote two threads above.

    If someone has a serious problem, it's not grace to say .... and if you write some nonsense to make a post and make fun of it, it's happy.
  • #1060 20526724
    rokbok
    Level 39  
    Posts: 4222
    Help: 617
    Rate: 983
    Relax man and don't make a fool of yourself, there was a discussion about the translation so I wrote what the translation means, and if you have a problem, solve it on your own, not on the forum ;) .

    velkhor wrote:
    This is exactly what I wrote two threads above.


    Two threads above you wrote this:

    velkhor wrote:
    gitpusher wrote:
    But who translated it like that?

    Huawei on the web and on the app ;)
    Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    And there is no official translation plugin.


    Which actually says nothing apart from what everyone knows, yes, that's what Fusion Solar writes, I wrote what these terms mean and don't take sentences out of context by quoting randomly, e.g.

    velkhor wrote:
    rokbok wrote:
    In other words, the beginning and end of energy production on a given day.
  • #1061 20526742
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    rokbok wrote:
    Two threads above you wrote this:

    velkhor wrote:
    gitpusher wrote:
    But who translated it like that?

    Huawei on the web and on the app

    And there is no official translation plugin.


    Okay I actually wrote this more than 2 threads ago. But the fact is there is an opportunity to fuck off.

    As for:
    rokbok wrote:
    Relax man and don't make a fool of yourself, there was a discussion about the translation, so I wrote what the translation means, and if you have a problem, solve it on your own, not on the forum.


    The discussion was not about the translation, but about the inverter shutdown, which was described and explained that the translation is usually misunderstood. You can read it below because I see you are not following the topic.

    velkhor wrote:
    rokbok wrote:
    akir19 wrote:
    so that the inverter turns off at night instead of going to sleep?


    If you want to control the consumption, consumption and self-consumption in the future using a power meter, then in the case of switching off the inverter for the night, the indications will be false (consumption).


    Gentlemen, I think I need some clarification.
    in HA there is "Startup Time" and "Shutdown Time", unfortunately translated into Polish was wonderfully as switching on and off the inverter. This is the switching on and off of the inverter producing electricity. The inverter cannot be turned off in any software way. Even the slider you have in fusion solar turns this inverter on and off. (of course we are talking about the EU version because the Chinese is completely off)


    I'm ending offtopic discussions, so if someone says something sensible, I'll join.

    I say goodbye coldly.
  • #1062 20550300
    Daris
    Level 20  
    Posts: 671
    Help: 18
    Rate: 93
    Hello,

    I have a question about the counter for huawei. I bought a replacement:
    https://allegro.pl/oferta/licznik-energii-do-huawei-sun2000-vs-dtsu666-h-13011733478

    I connected the 1.5m twisted pair using one pair to the inverter socket with pins 7 and 9 according to the manual. The meter according to the seller is factory-configured for sun2000 and I actually checked the following settings:
    addr: 11
    baud: 9600
    date: n.8.1
    port: rtu

    I don't know how to start the counter in the application. I have access to the admin panel. Should it appear automatically or do you have to add it somehow? Please help as I've been stuck on this for a while now and I can't seem to finish it.

    Or do I have to connect directly to the inverter and only then will I have the meter functions?

    Added after 3 [hours] 3 [minutes]:

    I got it, after connecting directly to the inverter, it was possible to add a counter. It works without a problem.
  • #1063 20550492
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    Daris wrote:
    Hello,

    I have a question about the counter for huawei. I bought a replacement:
    https://allegro.pl/oferta/licznik-energii-do-huawei-sun2000-vs-dtsu666-h-13011733478


    Thanks. It's good to know that someone is making "fakes" of Chinese that work :)
    I understand that you can see the production and consumption in the app? Can you check it with HA?

    Daris wrote:
    I connected the 1.5m twisted pair using one pair to the inverter socket with pins 7 and 9 according to the manual.


    The original cable is 0.35mm2 (shielded CABLE), and the twisted pair is 0.127mm2 wire in the basic version, not shielded. I'd be a little scared... but I get it, you don't usually want to do the same job twice...

    Daris wrote:
    Or do I have to connect directly to the inverter and only then will I have the meter functions? Added after 3 [hours] 3 [minutes] :O I garnered, after connecting directly to the inverter, it was possible to add a counter. It works without a problem.


    If I remember correctly, it can also be added via the web. Once, I accidentally clicked on the energy storage .... and you know how you physically don't have it, but it doesn't work :D
  • #1064 20550670
    Daris
    Level 20  
    Posts: 671
    Help: 18
    Rate: 93
    The counter works, everything shows as the original. I don't have the original but I think it's enough to control the network. The twisted pair is a meter and a half at most, cat 6, the fact that I only used two wires, but it has been working since yesterday, so it will probably work.

    I couldn't find adding a counter in the online application.

    In summary, the counter works and no presets are needed. We plug it in, add it in the inverter by connecting it directly with a mobile phone and wait a moment as it all updates in the online application.

    ps. everyone should have something like this at home, great for monitoring.
  • #1065 20550695
    oliniusz
    Level 7  
    Posts: 7
    It's nice that there is a cheaper alternative, good to know!

    I already have this original meter and I also used a twisted pair cable, which I had by luck going through a hole in the vertical from the basement with the inverter to the first floor to the meter. It was unused from the old days, and I couldn't pull it out or use a different cable because the bricklayer later poured cement into the hole.

    The twisted pair is fifteen or twenty meters long and the communication works without any problems, I twisted additional pairs together for a larger cross-section, just in case.
  • #1066 20566174
    WS Transport AS
    Level 11  
    Posts: 19
    I have a 10ktl inverter - M1, rooftop 11200W all south. The maximum temporary power of the installation does not exceed 7100W. In my opinion, this is definitely not enough. The graph is completely missing peaks, the graph looks as if it has been cut off. In the network and security parameters, the values are set to maximum. Where else can you look for the cause of limiting power? Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar [/url]
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  • #1067 20566235
    Robyn212
    Level 16  
    Posts: 197
    Help: 12
    Rate: 30
    Maybe you have too strong panels that have a current greater than 11A
  • #1068 20566250
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    WS Transport AS wrote:
    The maximum temporary power of the installation does not exceed 7100W. In my opinion, this is definitely not enough.

    I can't enlarge the photo, it's hard to relate without it, but it looks rather like a power cut in production, not the maximum current.
    Can you give more information about the panels, number of strings, etc?

    I don't remember where it was in the app, but it's on the web at:
    Inverter settings -> Power regulation -> Value reduction of active power (W) In addition to the input field, you should have given limit values, for KTL-11, it is probably 0-12100 (writes from memory).
    If the installer put a "block" there, he may have done it intentionally. Huawei do not have a power limit turned on by default, at least I have not encountered it. What is your declared power connection, what wires.
    Don't touch the rest of the parameters!!!
  • #1070 20566641
    Baqo
    Level 16  
    Posts: 233
    Help: 11
    Rate: 83
    Maybe it's a blockage on the operator's side.
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  • #1071 20566685
    WS Transport AS
    Level 11  
    Posts: 19
    10KW inverter. On the roof, 2 strings connected to two MPPTs. The first string of 13 panels of 415W, the second string of 14 panels of 415W. The inverter works with the 3x230 V IT installation. At the moment, the inverter is running, but it needs to be optimized, among other things, the active power. Can someone who knows exactly about the settings of Huawei inverters, be able to conduct an online course with me and explain what, what function means, and how to select parameters in individual windows? Of course, for a fee.
    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 Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    Attachments:
    • Parametry ustawień 10 ktl.zip (75.68 KB) You must be logged in to download this attachment.
  • #1072 20566687
    WS Transport AS
    Level 11  
    Posts: 19
    >>20566641 I don't think so. And anyway, how would the operator affect the active power of the inverter?

    Added after 2 [minutes]:

    [postid:c1e8712b67]20566618 Nie podałem, bo tamten problem został rozwiązany. Falownik został uruchomiony, jednak moc jest ograniczana którymś z parametrów.[/postid:c1e8712b67]

    Added after 5 [minutes]:

    [postid:c1e8712b67]Parę postów niżej powklejałem zdjęcia z ustawień. Zabezpieczenie główne jest 63 A 3x230V[/postid:c1e8712b67]
  • #1073 20566922
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    strucel wrote:
    It is a pity that he did not give what in his second post https://www.elektroda.pl/rtvforum/topic3974432.html#20556899#20556899

    Well done. It's a shame that people write what and how....

    WS Transport AS wrote:
    I didn't, because that problem was solved.

    It has not been resolved. It doesn't work as it used to, so something is wrong. You can't say something works A LITTLE right, either it works right or it doesn't. Just like something not a bit clean :)
    And the fact that you didn't write that the installation in Norway is another minus, because none of us know what the conditions are there, the connections, what protections and restrictions the operator uses, etc.

    But back to the topic. From this second post, it actually looks like it's not limited by the inverter. Take a screenshot but from the computer so that you can see this line up or is it straight because it seems slightly wavy. As the wavewik cuts, it is always a "needle". Give the model of the PV panels, because I'm starting to wonder if there is a problem with the selection.

    When it comes to installations, are you an installer, or did someone install them and they don't work?
  • #1074 20566976
    WS Transport AS
    Level 11  
    Posts: 19
    I checked. Rated current of panels 10.7A. Short-circuit - 11.17A. It is within the norm.
  • #1075 20566999
    velkhor
    Level 10  
    Posts: 49
    Rate: 3
    Okay, I don't want to write a million times and do offtopic. Because later, when someone is looking for information, they have to wade through junk messages that don't add anything, so I'll be brief.
    If you have a problem and you ask, and someone of good will wants to help you, and you don't answer questions, what should we, who are willing to help, think about you?

    For your convenience:

    velkhor wrote:
    Take a screenshot but from the computer so that you can see this line up or is it straight because it seems slightly wavy.

    Your answer is missing.

    velkhor wrote:
    Give the model of the PV panels, because I'm starting to wonder if there is a problem with the selection.

    You:
    WS Transport AS wrote:
    I checked. Rated current of panels 10.7A. Short-circuit -11.17A. It is within the norm.

    The panel has more parameters than just current.
    But since it's fine, and you don't want to say anything about the installation specification, you have concealed that the installation is in Norway. I am asking why did you come here? Do you want to boast that everything is OK and does not work or how because I don't get it.

    velkhor wrote:
    When it comes to installations, are you an installer, or did someone install them and they don't work?

    Another ignored question.

    Without the above answers, I give up, maybe one of my esteemed colleagues will want to read coffee grounds, a crystal ball or whatever.
  • #1076 20567007
    WS Transport AS
    Level 11  
    Posts: 19
    >>20566922 I sell inverters and panels with assembly elements. The customer bought via an online store, installed it by his Norwegian electrician. Now it is not known whose side is at fault. Panel parameters: Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    The graph of the function is not a perfect "needle", it is slightly wavy: Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar
    And here is the specification of the inverter: Huawei SUN2000 Inverter: WIFI Dongle Connection, Firmware Update & FusionSolar

    Added after 29 [minutes]:

    >>20566618 What is there in this second post that is not in this one?
  • #1077 20567090
    Baqo
    Level 16  
    Posts: 233
    Help: 11
    Rate: 83
    WS Transport AS wrote:
    Hello group.
    I encountered the problem of configuring the Huawei 10ktl m1 inverter for the 3x230V IT network. Installation site in Norway. It's just a startup problem. in network parameters I choose the EN-50549 network , three-phase three-wire installation, unearthed input with transformer. After several attempts, I managed to run the installation, but I was so careless that I did not take notes from the settings. After a month of time, the customer began to complain that the installation only gives 7 kW out of 10 kW. And it really looks like something in the settings just cut power. m experiment with the settings, as a result of which the inverter informs about the error: grid voltage too low. Has anyone encountered such a problem?


    Czech power grid CZECH-EN50549-LV230.
    Voltage level (V): 400V
  • #1078 20567151
    strucel
    Level 36  
    Posts: 3070
    Help: 269
    Rate: 610
    WS Transport AS wrote:
    >>20566641 I don't think so. And anyway, how would the operator affect the active power of the inverter?


    For several years, inverters installed in the EU must support LFSM-O, the fact that our operators do not use it does not mean that it is so in the entire EU, but it will be rather difficult for you to find a RES specialist in Norway here.
  • #1079 20567153
    WS Transport AS
    Level 11  
    Posts: 19
    The inverter started with the settings as they are, on the Czech LV230 network - low voltage 230v. Now it comes to active power, which does not exceed 7100w and with a 10 kW inverter and 11200w panels it should give over 8000w.
  • #1080 20567215
    gitpusher
    Level 12  
    Posts: 50
    Help: 1
    Rate: 7
    WS Transport AS wrote:
    The inverter started with the settings as they are, on the Czech LV230 network - low voltage 230v. Now it comes to active power, which does not exceed 7100w and with a 10 kW inverter and 11200w panels it should give over 8000w.


    I don't understand why you don't set the correct localization norm. So in this case, the relevant Norwegian standard. After all, it depends on a number of other factors, voltage limits, etc.
    The fact that he started in the Czech Republic is not an argument for me. It could just as well "start" on many others - but is it supposed to be set like this?
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Topic summary

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

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

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

Quick Facts

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

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

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

What causes the SUN2000 to trip on sunny days?

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

Can I lift the 253 V reconnection limit?

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

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

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

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

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

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

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

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

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

Installer owns the FusionSolar site – can I get control?

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

Lost inverter password – how to reset?

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

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

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

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

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

How do I clear old alarms in FusionSolar?

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

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

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

Quick 3-step: add new owner without installer

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