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

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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #811 19475708
    pawelstr147
    Level 10  
    I have a question about the maximum power of the Sofar KTL-X 8.8 inverter generator. Some offers show 9,600W and others 11,000W. Are there two different models of inverters?
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  • #812 19475811
    3301
    Level 34  
    In many cases, especially as a south-facing installation, 9600 is too much, but actually in one of the cards they give 11 kW. There is one inverter and there are several cards.
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  • #813 19475983
    toolpusher
    Level 23  
    Do you think that when you connect 12kWp or 13kWp, something will happen? These are indicative data. It's important to keep an eye on the tensions and currents on the strings.
    The inverters from 8.8 to 11 are the same inverters, but the output power programmed by the manufacturer is different, which, by the way, can be easily changed by hardware.
  • #814 19476228
    pawelstr147
    Level 10  
    toolpusher wrote:
    Do you think that when you connect 12kWp or 13kWp, something will happen? These are indicative data. It's important to keep an eye on the tensions and currents on the strings.
    The inverters from 8.8 to 11 are the same inverters, but the output power programmed by the manufacturer is different, which, by the way, can be easily changed by hardware.


    If indicative, no problem, the inverter has one MPPT 11A input, so you can easily give more than 9600W. I thought so too, but wanted to be sure.
  • #815 19478070
    SilverX
    Level 11  
    toolpusher wrote:
    Do you think that when you connect 12kWp or 13kWp, something will happen? These are indicative data. It's important to keep an eye on the tensions and currents on the strings.
    The inverters from 8.8 to 11 are the same inverters, but the output power programmed by the manufacturer is different, which, by the way, can be easily changed by hardware.

    Rather, you change the settings in the software with jumpers ... In fact, you had less efficiency when you connected one string in parallel to two MPPTs?
  • #816 19479193
    toolpusher
    Level 23  
    I did not make such measurements because they are difficult to do and the difference is probably less than 1%
  • #817 19480137
    jareksz
    Level 12  
    Hello, I am asking for advice, I am waiting for the replacement of the Sofar solar 11 ktl-x inverter for 26 days by the service for a new one and still do not know when the new inverters will be
    the installer offered me to replace the inverter with Foxess T10, agree to this replacement or still wait for the Sofar inverter?
  • #818 19480153
    prose
    Level 35  
    jareksz wrote:
    the installer offered me to replace the inverter with Foxess T10, agree to this replacement or still wait for the Sofar inverter?

    And from scratch the papers in ZE.
  • #819 19480248
    toolpusher
    Level 23  
    Additionally, when you got the "My Electricity" subsidy, you cannot change the inverter for 3 years.
  • #820 19480375
    jareksz
    Level 12  
    toolpusher wrote:
    Additionally, when you got the "My Electricity" subsidy, you cannot change the inverter for 3 years.

    I haven't submitted papers for "My Electricity" yet because the inverter has died 35 days after it was installed.
  • #821 19480415
    toolpusher
    Level 23  
    SOFARSOLAR Poland carries out warranty claims in accordance with the procedure
    1) 14 days from the date of the complete warranty claim
    If the inverter does not work and does not process electricity, SOFARSOLAR Poland
    undertakes to consider the complaint within 14 working days from the date
    receipt of a complete notification. When it is necessary to replace the inverter with a new one
    it will take place no later than within 14 working days from the positive consideration of the application.
    If it is necessary to replace spare parts with new ones, a service visit will take place
    not later than within 14 days from the date of positive consideration of the application.

    I think you are entitled to some compensation. Another thing is how to enforce it.
  • #822 19480437
    grzes601
    Level 14  
    prose wrote:
    jareksz wrote:
    the installer offered me to replace the inverter with Foxess T10, agree to this replacement or still wait for the Sofar inverter?

    And from scratch the papers in ZE.


    The FOXESS T10 is a completely different world. Full MPPT power, not low power as in SOFAR.
    With the FOX inverter you will achieve more power when your MPPT are looking in different directions.

    You have the documents for FOX in the link;
    https://sklep.sunprofi.pl/foxess/290-fox-t10.html
    After tasting FOX, I will never take SOFAR again

    If you want to get to know sofarsolar poland, go to google and see the great sofara service (fries are missing)
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  • #823 19480443
    jareksz
    Level 12  
    toolpusher wrote:
    SOFARSOLAR Poland carries out warranty claims in accordance with the procedure
    1) 14 days from the date of the complete warranty claim
    If the inverter does not work and does not process electricity, SOFARSOLAR Poland
    undertakes to consider the complaint within 14 working days from the date
    receipt of a complete notification. When it is necessary to replace the inverter with a new one
    it will take place no later than within 14 working days from the positive consideration of the application.
    If it is necessary to replace spare parts with new ones, a service visit will take place
    not later than within 14 days from the date of positive consideration of the application.

    I think you are entitled to some compensation. Another thing is how to enforce it.


    They do not have inverters and they do not know when they will have them, Sofarsolar Poland does not compensate for exceeding the 14-day deadline (replacement was decided 26 days ago). My panels are for decoration.
  • #824 19480454
    toolpusher
    Level 23  
    I think that you could do something with a lawyer, only who wants to kick for a few zlotys. The fact that the Sofar company gives nothing does not matter. You are losing real money after these 14 days.
  • #826 19480483
    toolpusher
    Level 23  
    Go to him and give him a presentation. As for me, you are an ordinary beater because you have already run into Sofara once. Similar to my colleague on D.
  • #827 19480501
    grzes601
    Level 14  
    toolpusher wrote:
    Go to him and give him a presentation. As for me, you are an ordinary beater because you have already run into Sofara once. Similar to my colleague on D.

    I will not defend a company that treats customers like cannon fodder for no reason.
    I work on 10000TL-Sx, 11KTL-X, T15 and I have a comparison practically online.
    Go to the sofara service in Warsaw, watch the dead bodies on the walls with the ladies and talk about technical matters. Then write what it was like on the trip.
  • #828 19480697
    prose
    Level 35  
    grzes601 wrote:
    The FOXESS T10 is a completely different world. Full MPPT power, not low power as in SOFAR.
    With the FOX inverter you will achieve more power when your MPPT are looking in different directions.

    For me, the sofar works at full power on each MPPT, I do not know what you mean by poor power? The poor is the Foxss measure.
  • #829 19480707
    grzes601
    Level 14  
    What I mean is that in the 11KTL-X the maximum power of one MPPT is only 6200W
  • #830 19480737
    Cytro12
    Level 26  
    This Foxess is aggressively entering the market, someone knows how it works, at what temperatures, efficiency, what software, etc. because you know these technical data, they are all great on paper.
  • #831 19480742
    3301
    Level 34  
    grzes601 wrote:
    What I mean is that in the 11KTL-X the maximum power of one MPPT is only 6200W


    There are also cards from 8800 as well as those where there are no restrictions on individual mpp.
  • #832 19480765
    prose
    Level 35  
    grzes601 wrote:
    What I mean is that in the 11KTL-X the maximum power of one MPPT is only 6200W
    But what's the problem you connect the two inputs in parallel and you have 12400W.
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  • #833 19485841
    ja_pizgam
    Level 10  
    Can anybody give me some software between v2.50 and 2.90 for KTL-X 5.5? I tried to update to version 2.90 but it crashed with the ARM file and grounded my inverter.
  • #834 19485855
    3301
    Level 34  
    Another example that not everyone will work with the high version, for what purpose do you want 290? what will change? 220 is the most stable and it solves the problem with the power and I can give up this one.
  • #835 19485888
    ja_pizgam
    Level 10  
    The version with the inverter is 2.50, I had a problem with the inverter turning off with a sudden jump in the voltage of the panels (as the sun was coming out from behind the clouds, even on a cloudy day) and I contacted the installer and confirmed that the problem occurs on this version and sent a newer version I tried to update only today and there was a problem, and the installer has turned off the phone on the weekend, so I'm looking for help here so as not to lose 2 days of production.
  • #836 19485898
    3301
    Level 34  
    If it was as you wrote "the problem with the inverter turning off with a sudden jump in voltage of the panels", what errors appeared? and what would they be related to? with the voltage from the modules or with the current?
    Maybe you have too many modules in the string or these modules have an I mpp greater than 11A.

    If you do not want to lose, load 220, then you will re-upload what you want and maybe it will not lock, I can withdraw.
  • #837 19485901
    prose
    Level 35  
    ja_pizgam wrote:
    The version with the inverter is 2.50, I had a problem with the inverter turning off with a sudden jump in the voltage of the panels (as the sun was coming out from behind the clouds, even on a cloudy day) and I contacted the installer and confirmed that the problem occurs on this version and sent a newer version I tried to update only today and there was a problem, and the installer has turned off the phone on the weekend, so I'm looking for help here so as not to lose 2 days of production.

    Maybe exactly what problem do you have, what do you mean?
  • #838 19485932
    ja_pizgam
    Level 10  
    The problem is currently blocked inverter because the ARM file from version 2.90 has not updated at all (DSP1 and 2 are in version 2.90 already), I do not know what exactly was the problem because after reporting to the company what was installed, the first question was whether I have version 2.50 because it already had a dozen or so reports from this version, I had one, so he sent me a newer firmware, due to lack of time, I wanted to update today, but there was a problem and I cannot contact the company (phone is turned off), so probably only on Monday I will call them and I don't want to waste 2 days production, so I want to go back to a lower version, or at least to this 2.50, and if it can even be this version 2.20, so be it.
  • #840 19486012
    ja_pizgam
    Level 10  
    I only see version 2.90 here, but the problem is the same on ARM crashes error, I tried 4x intermittently, so I guess my inverter hardware version (1.00) doesn't support this version.
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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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