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SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters

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  • #1261 19985811
    dddmmm
    Level 9  
    Janusz_kk wrote:
    dddmmm wrote:
    Maybe you can suggest how to do it?

    Open this file with the manual, preferably on a laptop, on page 41 you have buttons and a description, press 1 on the left (menu)
    and use the arrows to the 1st setting and right (ok) you enter, then the arrows to the 9th position set the mppt again ok and with the arrows you change from 'independent' to 'parallel', approve ok and exit 'menu', 'menu', 'menu' I don't think he should ask for a password and as he says, select 0001 with the arrows and confirm with approx.

    Thank you very much, I ordered a CONNECTOR MC4 DOUBLE PARALLEL CONNECTOR and when it comes, I will switch the installations to one string, probably it will be possible to do it only on Saturday. I will let you know what the effect will be. Send me your details on priv. I owe you, I wanted to pay you back.
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  • #1262 19985895
    Janusz_kk
    Level 39  
    When you have a connector, you don't have to change it in the settings.
  • #1263 19986443
    dddmmm
    Level 9  
    Janusz_kk wrote:
    When you have a connector, you don't have to change it in the settings.

    thanks again, waiting for your data, you can write to mayewski(_at_)tlen.pl
  • #1264 19986493
    Janusz_kk
    Level 39  
    dddmmm wrote:
    thanks again, waiting for your data, you can write to mayewski (malpa) oxygen.pl

    Ie?
  • #1265 19986992
    dddmmm
    Level 9  
    Janusz_kk wrote:
    dddmmm wrote:
    thanks again, waiting for your data, you can write to mayewski (malpa) oxygen.pl

    Ie?

    I want to repay the advice
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  • #1266 19986999
    Janusz_kk
    Level 39  
    dddmmm wrote:
    I want to repay for the advice

    Cool, I helped because I wanted to, drink a beer or wine for my health, whatever you like there :)
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  • #1267 19987004
    Krzychooo
    Level 16  
    dddmmm wrote:
    I want to repay the advice

    Helpful post? + 0


    Click on that bug. He probably deserved, no. (?)
  • #1268 19987162
    m2tk
    Level 13  
    I will also ask if such a setup is possible:
    Sofar 12KTLX-G3 Link and 2 strings of 11 modules JKM460M-7RL3 Link

    Can you connect it into one string and connect additional modules to the other or is it an exaggeration?
    Currently, the string is approx. 11A at 450V (max. 14A and 6.5kW peak)
  • #1269 19987330
    Janusz_kk
    Level 39  
    The power would still expel the inverter, but 22 panels in series are too high voltage, Voc = 1137V for start is too much and in winter it can increase to 1250V. Max of these panels in 1 string is 18, which gives Voc = 1065V, for a max inverter 1100V.
  • #1270 19987435
    Baqo
    Level 16  
    m2tk wrote:
    I will also ask if such a setup is possible:
    Sofar 12KTLX-G3 Link and 2 strings of 11 modules JKM460M-7RL3 each Link

    And how did you walk around the 80% prosumer?
    You did not want to take the Sofark 102KTLX-G3 or the 8.8kW you will be developing?
  • #1271 19987599
    msr99
    Level 20  
    What mattered in the prosumer was the power of the panels, not the inverter
  • #1272 19987803
    m2tk
    Level 13  
    Janusz_kk wrote:
    The power would still expel the inverter, but 22 panels in series are too high voltage, Voc = 1137V for start is too much and in winter it can increase to 1250V. Max of these panels in 1 string is 18, which gives Voc = 1065V, for a max inverter 1100V.


    So 4pcs would have to be attached to the second string and added a few. Only then the other one will not be too weak?
    How is the recommended PV input 18kWp to max AC output 13.2kW? Now, if I have 10kW with 10kWp, how much can I add in order not to exceed 13.2kW?
    I don't want to unfasten too much of the first one because it's south.

    Baqo wrote:

    And how did you walk around the 80% prosumer?
    You did not want to take the Sofarka 102KTLX-G3 or the 8.8kW you will be developing?


    a) I didn't care about the prosumer, and there is also a 70% return option at> 10kW
    b) They did not have another inverter, so they gave 12kW, 10 would probably also be enough, 8.8 would cut the production a lot.
    Now it was already 10kW.
  • #1273 19988200
    dddmmm
    Level 9  
    Krzychooo wrote:
    dddmmm wrote:
    I want to repay the advice

    Helpful post? 0


    Click on that bug. He probably deserved, no. (?)

    Several people sent their hints and I am really impressed that there are people willing to help others selflessly.
    I greet everyone, I will inform you in due time about the results of the implemented activities.
  • #1274 19988355
    Janusz_kk
    Level 39  
    m2tk wrote:
    So 4pcs would have to be attached to the second string and added a few. Only then the other one will not be too weak?

    What do you have in the latter and how much?
    m2tk wrote:
    How is the recommended PV input 18kWp to max AC output 13.2kW? Now, if I have 10kW with 10kWp, how much can I add in order not to exceed 13.2kW?

    In no way, the panels have several important parameters, similarly, the inverters have several that define their maxima and they cannot be exceeded, none. Refer to the tables and count, the open circuit voltage (+ 6V per panel in winter) of the panel, power and current.
  • #1275 19988651
    jjj111222333
    Level 2  
    The standard for my utility provider is 192v min Voltage trigger. 022 country code works fine but it is out of spec for my utility provider. Sofar support has not been very helpful. They keep suggesting to use one of the standard country settings but none of the country settings suit for my utility provider.

    The Sofar website does not provide the safety parameter files for the KTL-X series. All other series they provide it.

    And in case a TXT (csv) file for another country is available, is it possible to edit the safety parameter values TXT (csv) file to obtain custom configurations? The values in the txt (csv) file seem to co-relate with the settings values.

    All I want is just one parameter to be changed nothing else. This way I will be in spec for every other parameter except for the low voltage tripping.

    Has anyone done editing of the safety parameter file???

    Please advice!

    Jen
  • #1276 19990128
    Baqo
    Level 16  
    m2tk wrote:

    a) I did not care about the prosumer, and there is also a 70% return option at> 10kW
    b) They did not have another inverter, so they gave 12kW, 10 would probably also be enough, 8.8 would cut the production a lot.
    Now it was already 10kW.


    I would give up one link, I would prefer 10% more.
    Now you have only one way with such an inverter, you need to load it properly, i.e. add the cells to the mask, how to install it. Adding only the cells to the existing installation shortens the return on investment, but if you still have a place to use this excess energy.

    I have 9.72kW and I would like to expand it to 15-17kW, but I have nowhere to hang it.
  • #1277 19990352
    borgen
    Level 11  
    Janusz_kk wrote:
    When you have a connector, you don't have to change it in the settings.

    Why does it not have to change the settings for parallel connection?
    If he connects all panels in series and uses these branched MC4 connectors to connect the panels to two MPPTs, the inverter will throw an error with the independent diagram.
  • #1278 19992590
    Janusz_kk
    Level 39  
    jjj111222333 wrote:
    And in case there is a TXT (csv) file for another country, is it possible to edit the TXT (csv) file of the security parameter values to get custom configurations?

    You can, remember how the parameters are coded.
  • #1279 19998905
    elektronik123456789
    Level 22  
    slonina wrote:
    The gradual reduction in power before the cut-off voltage is reached is identical to version 2.90.


    What menu item allows you to activate this option? I am asking for the future, if I had any problems with excessive tension. Is it a KTL-X series inverter?
  • #1280 19999975
    xury
    Automation specialist  
    At home, on 290, I did not notice a reduction in power when reaching 253V. Fortunately, this voltage does not last longer than 10 minutes, so the inverter does not turn off and works almost full steam 5.4kW for ktlx 5.5kw.

    Added after 5 [minutes]:

    jjj111222333 wrote:
    Has anyone edited the security parameters file ???

    Yes, I did it and it works, but I do not provide a solution due to possible abuse. At home, I only turned off Vtenmin prophylactically.
  • #1281 20000076
    msr99
    Level 20  
    Baqo wrote:
    I would like to expand it to 15-17kW, but I don't have anywhere to hang it anymore.


    wait for 700W bifacial panels and put them on the ground ;)
  • #1282 20001682
    slonina
    Level 11  
    elektronik123456789 wrote:
    slonina wrote:
    The gradual reduction in power before the cut-off voltage is reached is identical to version 2.90.


    What menu item allows you to activate this option? I am asking for the future, if I had any problems with excessive tension. Is it a KTL-X series inverter?


    The power reduction with voltage increase is with the country code setting 002 (Australia) and starts above 250V. I had this position by mistake.
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  • #1283 20001920
    Damian8851
    Level 6  
    Does anyone know how I can increase the voltage on the inverter? I would only like to increase it by 1-2V.
  • #1284 20034699
    chris2807
    Level 10  
    slonina wrote:
    JEDD wrote:

    In my case, for the update to 3.02 to be successful, it was necessary to rename the file from 4-12KW_ARM.hex to ARM.hex

    I confirm the need to rename the files when upgrading from version 2.90. At first glance, you don't see the difference between 2.90 and 3.02. The gradual reduction in power before the cut-off voltage is reached is identical to version 2.90.


    And was the upgrade to the next firmware versions (3.10 and 3.40) correct?
  • #1285 20036520
    slonina
    Level 11  
    chris2807 wrote:
    slonina wrote:
    JEDD wrote:

    In my case, for the update to 3.02 to be successful, it was necessary to rename the file from 4-12KW_ARM.hex to ARM.hex

    I confirm the need to rename the files when upgrading from version 2.90. At first glance, you don't see the difference between 2.90 and 3.02. The gradual reduction in power before the cut-off voltage is reached is identical to version 2.90.

    And was the upgrade to the next firmware versions (3.10 and 3.40) correct?

    Attempts to upgrade directly from 2.90 to a version higher than 3.02 were unsuccessful. Let me know when you manage to go higher from 3.02.
  • #1286 20036575
    JEDD
    Level 29  
    In my version of the inverter it cannot go beyond 3.02. I don't want to update ARM, I probably have some unsupported version. By the way, 3.02 also somehow came up, because when I wanted to throw 3.40 and there was an ARM update error, when reloading 3.02 there was also a problem with ARM, fortunately DSP1 and DSP2 were downgraded and I still have 3.02.
  • #1287 20043570
    slimax
    Level 17  
    Is it possible to increase the power of 8.8kw G3 inverter to 10kw (11KTLX-g3)? The markings on the disc show that maybe so. Maybe someone has 11KTLX-g3 and could post photos of the inside of the processor area?

    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters

    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters

    The power of the panels is strongly limited around noon for about 4 hours and the suggestions of the manufacturer of this inverter are 12kwp, panel power at this power is according to me stupid.
    The same as writing that the inverter works best in the range of its maximum power because it is the most effective, while the previous version of this inverter is the same hardware for several power ranges and somehow it is git and most of the time the inverter works below its rated power.
  • #1288 20043638
    m2tk
    Level 13  
    You mean the newer model - 8.8KTLX-G3 (the one with 2 buttons)?

    At these prices:
    Code: text Expand Select all Copy to clipboard
    Sofar Solar 8.8KTLX-G3 - 3700zł netto
Sofar Solar  11KTLX-G3 - 4000zł netto
Sofar Solar  12KTLX-G3 - 4200zł netto
    saving is stupid.

    I have a 12KTLX-G3 (Recommended PV 18kWp) and I believe it is Thread too big for 10kWp. The AC power exceeds (in gusts) 11kW.
  • #1289 20043644
    slimax
    Level 17  
    Yes, this is the latest version with two buttons.
    Well, unfortunately, it was already after the fact and the company installed such an inverter.
    No savings, but you can see the company has a few hundred in its pocket and I was left with what is.
    Unfortunately, I did not have time to look into what inverter they install and that the company is recommended and professional at all ... ehhh :(
    Of course, they see no problem because the manufacturer recommends even 12kwp panels for this inverter, so what do you want.
  • #1290 20043655
    m2tk
    Level 13  
    If a professional company and under warranty, I would advertise it because their task was to choose the optimal one, they would make you lose kW of production if it cuts it. Who selected the installation parameters? The installer should know that the 8.8 model cannot handle 10kWp.
    Unless this one professionalism they only have in creating advertising material.

    Maybe they can replace it for a small extra charge? My supplier has this option.

    With max. 4 hours of cutting, you lose 2 / 3kW per day, which in the production of 60kWh gives 4/5% * of sunny days.
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Topic summary

The discussion centers on experiences with Sofar inverters in approximately 8kW photovoltaic (PV) installations, focusing on technical issues, durability, and configuration challenges. Users report generally stable operation with models like Sofar 6.6KTL-X and 5.5KTL-X over extended periods, though some face connectivity problems, especially with Wi-Fi and software availability. A recurring technical problem involves input voltage exceeding the maximum allowed 600V DC for single-phase Sofar inverters (notably the 4KTLM-G2), causing errors such as PVOVP and BusOPV and inverter shutdowns. This is often due to too many PV panels connected in series on a single string, with 15 Q.CELLS Q.PEAK G4.1 305W panels sometimes exceeding voltage limits, especially in cold conditions where voltage rises. Solutions include splitting panels into two strings (e.g., 8 and 7 panels) connected to separate MPPT inputs, though some users report this does not fully resolve the issue. The maximum recommended panels per MPPT input is around 9 to avoid surpassing power and voltage limits. Users also discuss the need for three-phase inverters for larger installations above 7kW on a single phase due to grid operator restrictions. Software and firmware updates are sought after but not easily accessible, with some users lacking Polish language support. Comparisons with other brands like SMA and Fronius highlight Sofar's cost advantage but raise concerns about long-term reliability and service support, which is still developing in some regions. Network-related errors such as Grid OFP (over-frequency) have been reported, with troubleshooting involving network frequency checks and inverter restarts. Overall, Sofar inverters are considered a cost-effective option with some technical caveats related to system design, installation quality, and support infrastructure.
Summary generated by the language model.
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