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

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  • #721 19445046
    grzes601
    Level 14  
    toolpusher wrote:
    The Sofar 11KTL-X has a maximum output power of 11000VA so everything is fine. With the new soft above V2.20, the continuous power is 11kW.

    This note about v2.20 is very important to me. So far I was convinced that 10kW is the norm, and here's a surprise.
    When I bought the inverter, I only had csv files on the SD.
    Can my colleagues ask for firmware v2.30 or higher for KTL-X
    Thank you in advance.
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  • #722 19445139
    3301
    Level 34  
    It doesn't have to be above, 220 does the trick too.
  • #723 19445209
    toolpusher
    Level 23  
    grzes601 wrote:

    Can my colleagues ask for firmware v2.30 or higher for KTL-X
    Thank you in advance.


    But if you want to limit the power to 10kW, you should look for a software older than V2.20.
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  • #724 19445702
    grzes601
    Level 14  
    Are software bugs removed along with the version number?
    If the correct solution for me to limit the maximum output power is a version lower than 2.20, then maybe you should consider using the menu in pos. 1.16 by entering the appropriate% value so as not to exceed the output power of 10000W.
  • #725 19445912
    casuss
    Level 2  
    Colleagues, I have a problem. I have a 5.5 ktl-x sofar. I had 2.10 software, I got 2.80 from a friend from the forum. Everything was fine until the error "DSPS File Error". I tried the second time after 5 minutes as instructed. Unfortunately, still the same error. "SWVersionFault" is now displayed. I am asking for advice. If anyone can, please send the file with firmware 2.70 or earlier. My mail casuss (at) interia.pl
  • #727 19446005
    Janusz_kk
    Level 39  
    Prose, do you have a Polish sofar manual?
  • #728 19446044
    jareksz
    Level 12  
    Hello. Since yesterday the Sofar Solar 11KTL-X does not work, the green diode is blinking, after turning the inverter off and on, it writes check and it does not work, please let me know what could have happened. Soft is 2.30 as shown on the nameplate.
    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
  • #729 19446066
    toolpusher
    Level 23  
    Janusz_kk wrote:
    Prose, do you have a Polish sofar manual?

    Here: Link

    Added after 1 [minutes]:

    jareksz wrote:
    Hello. since yesterday the sofar solar 11ktl-x does not work, the green diode is blinking, after turning the inverter off and on, it writes check and it does not work, please let me know what could have happened.

    And what errors does the solarman display?
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  • #731 19446094
    toolpusher
    Level 23  
    You probably have a faulty inverter - faulty PV input 1 or 2 or something else - Link
  • #732 19446113
    jareksz
    Level 12  
    toolpusher wrote:
    You probably have a faulty inverter - faulty PV input 1 or 2 or something else - Link

    Is it possible to check it without sending it to the site?
  • #733 19446162
    Janusz_kk
    Level 39  
    toolpusher wrote:
    Here: Link

    Thanks a lot :)
  • #734 19446267
    grzes601
    Level 14  
    I suspect that the ground check is active in menu 1.17.
    "1.Turn on"
    "2.Turn off"
    Fragment of the manual;
    The inverter will not start production if grounding is not present and properly wired; this setting is active by default on all three-phase inverters. If "2.Turn off" is selected, the inverter will start running and it will be possible to produce power even without connection to the ground line.
    I propose to verify it.

    casuss wrote:
    Colleagues, I have a problem. I have a 5.5 ktl-x sofar. I had 2.10 software, I got 2.80 from a friend from the forum. Everything was fine until the error "DSPS File Error". I tried the second time after 5 minutes as instructed. Unfortunately, still the same error. "SWVersionFault" is now displayed. I am asking for advice. If anyone can, please send me the 2.70 firmware file,

    A colleague of prose has provided a link to the very valuable website www.zcsazzurro.com
    https://www.zcsazzurro.com/pl/products/invert...ro-trifase-compact-3.3ktl-12ktl#about-section
    This link is the most interesting address for me this year.
    Good luck
  • #735 19446318
    toolpusher
    Level 23  
    If there was a problem with the grounding, it is unlikely that it would happen suddenly during the day and the red LED would be on.
  • #736 19446479
    Janusz_kk
    Level 39  
    grzes601 wrote:
    The inverter will not start production if grounding is not present and properly wired; this setting is active by default on all three-phase inverters. If "2.Turn off" is selected, the inverter will start running and it will be possible to produce power even without connection to the ground line.

    Is it about the ground connected to the heat sink or to the 'N' connected to the plug?
  • #737 19446654
    maxdax
    Level 11  
    toolpusher wrote:
    As a colleague prose wrote 6.6, only down can be moved.

    Works down to 8.8.
  • #738 19446683
    toolpusher
    Level 23  
    Impossible or maybe possible? Show me some photos.
  • #739 19446705
    galica01
    Level 16  
    maxdax wrote:
    toolpusher wrote:
    As a colleague prose wrote 6.6, only down can be moved.

    Works down to 8.8.


    It would be great news if you can post more details
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  • #740 19446707
    prose
    Level 35  
    maxdax wrote:
    toolpusher wrote:
    As a colleague prose wrote 6.6, only down can be moved.

    Works down to 8.8.

    But 8.8 has larger AC chokes I wonder if it will not heat up?
  • #741 19446737
    jareksz
    Level 12  
    toolpusher wrote:
    You probably have a faulty inverter - faulty PV input 1 or 2 or something else - Link

    I was doing tests, I disconnected PV1 and PV2 without changes, after switching on the check inscription and the green LED is blinking, will uploading the new firmware help?
    ps. has anyone got firmware 2.70?
  • #742 19446777
    3301
    Level 34  
    You do updates with the AC voltage off and the red LED is lit without any blinking and you should see the voltage from individual DC inputs, what firmware version do you currently have? because if the older one, e.g. 201,210, it is such an area. 250 is better not to install, there were problems with the suspension and stop of the inverter, the most stable is 220 and it is sufficient for correct operation
  • #743 19446815
    jareksz
    Level 12  
    Now I have 2.30 just like on the nameplate
    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
  • #744 19446832
    3301
    Level 34  
    If I can borrow something like 220, just check what's on the display after turning off the AC
  • #745 19446889
    jareksz
    Level 12  
    3301 wrote:
    If I can borrow something like 220, just check what's on the display after turning off the AC


    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
  • #746 19447014
    grzes601
    Level 14  
    Janusz_kk wrote:
    Is it about the ground connected to the heat sink or to the 'N' connected to the plug?

    In my opinion, it is about cables (plug with 5 wires).
    I have not connected the heat sink and I do not have an error, but I am going to connect the heat sink as well.
  • #747 19447045
    Janusz_kk
    Level 39  
    grzes601 wrote:
    In my opinion, it is about cables (plug with 5 wires).
    I have not connected the heat sink and I do not have an error, but I am going to connect the heat sink as well.

    And now I looked in the manual that there is PE in the plug and they also recommend connecting the heat sink to PE, it seemed to me that there is no PE in the plug, hence the question.
  • #748 19447148
    toolpusher
    Level 23  
    @jareksz

    If changing the software does not help, you just have to contact the service.
  • #749 19447180
    jareksz
    Level 12  
    toolpusher wrote:
    @jareksz

    If changing the software does not help, you just have to contact the service.


    Does anyone have 2.30 or higher?
  • #750 19447185
    toolpusher
    Level 23  
    Why do you need a higher one, it does not give you anything - upload soft 2.20 - there is a link in post # 726. If this does not help you, the inverter is blown. I have the impression that the inverter is without warranty and you are grabbing a razor.
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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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