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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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  • #661 19405176
    adamvfr
    Level 11  
    FrankAB wrote:
    After all, everything is described there - read and you will know what and how.

    Not such a complexity for me.
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  • #662 19405183
    3301
    Level 34  
    Enter the login is / n of the logger and send a request to customerservice(_at_)solarmanpv.com to change the data refresh, but the fact that there will be e.g. 5X more points on the chart or entries in the sheet will not change the fact that the AC voltage on the inverter exceeds the norm
  • #663 19405200
    Kons18
    Level 12  
    adamvfr wrote:
    toolpusher wrote:
    As standard, in the Sofarze, you can change the recording frequency from 5min to 60s. This is the shortest interval that Sofar offers by default.


    Can you tell me how to do it?

    It was probably even in this thread. You have to write to the Sofara service in English and provide the SN of the logger.
    I changed from 5 to 1 minute.
  • #664 19405383
    adamvfr
    Level 11  
    3301 wrote:
    Enter the login is / n of the logger and send a request to customerservice(_at_)solarmanpv.com to change the data refresh, but the fact that there will be e.g. 5X more points on the chart or entries in the sheet will not change the fact that the AC voltage on the inverter exceeds the norm

    Thanks for the info, of course it won't change. Today the sun has been shining steadily since the morning, and now the AC voltage has already exceeded 254V and the production is falling. On the second installation it is around 250V.

    The inverter is connected to the installation in the garage, the cable that was laid there from the switchgear is about 20m 2.5mm2, so you need to lay 6mm2.
    Looking at the Amperes of the second installation, which is on similar ampere panels, I can compare that what is shown to me on the PV1 is overstated because what is on the PV2 coincides with the neighboring installation.

    But no one has written / showed me how it is with you and the current on both strings, is there a difference between them?

    Added after 9 [minutes]:

    Advise, a cord or a 6mm2 wire.
    I have the impression that the line has a larger contact area because it flattens out more.

    Or better, move the inverter closer to the switchgear and put 4mm2 away from the panels
  • #665 19405595
    slawo12311
    Level 19  
    For me and for znojomego there are discrepancies between two of the same strings, these are so small differences that I do not pursue the topic, installations annually make a very good yield. Swapping the inputs does nothing, DC2 still has less current and power according to the measurements. The measurements may not be accurate.

    I have a single phase 4.6 kw G-2
    The familiar KTL-X 5.5
    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters n] SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
  • #666 19406852
    Grucha383
    Level 12  
    I have a 4.4kW installation and an inverter in the garage, which is connected to the main switchboard with a 40m 2.5mm2 cable and nothing happens.
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  • #667 19406928
    adamvfr
    Level 11  
    In my village, the voltage is generally high. 230V is a rarity, in the midday hours, 245V is the norm, no PV.
    Yesterday I measured the voltage in the socket at home and it was 4V lower than on the fuse at the inverter.
  • #668 19406944
    3301
    Level 34  
    Grucha383 wrote:
    I have a 4.4kW installation and an inverter in the garage, which is connected to the main switchboard with a 40m 2.5mm2 cable and nothing happens.


    Only that at 4.4 3-phase. the current in the wire will be 6.4 A and at 3.6 1-phase it will be 15.7 A so it is more than 4 times more
  • #669 19407130
    Cytro12
    Level 26  
    slawo12311 wrote:
    Swapping the inputs does nothing, DC2 still has less current and power according to the measurements. The measurements may not be accurate.

    This may require a coefficient reset, sometimes they are not calibrated too accurately, I do not know what parameter is responsible for it in Sinter, but in another inverter, the coefficient reset helped MPPT now go the same.

    If you have a brick meter, measure it and you will know if it is a measurement error.
  • #670 19408795
    adamvfr
    Level 11  
    I don't have a clamp meter yet.
    For now, I would like information on whether to buy a cable, a string or a wire.
    As for me a layman, the line connects better in the clamp, the contact area is larger.
  • #671 19408812
    3301
    Level 34  
    In this case it does not matter, max. the current is about 16A and this piece from the protection to the inverter should be flexible anyway
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  • #673 19409586
    stev-an
    Level 19  
    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters I am a user of sofara 3300tl-G3 and I want to ask what RS485 / USB communication looks like. What parameters can be observed? Is any application required.

    As for power switching, it's probably the red jumpers. For PLN 1500, there is not much of it in the inverter. SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
    Found on YT
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  • #674 19409676
    prose
    Level 35  
    @ stev-an You won't change here anymore.
  • #675 19411903
    stev-an
    Level 19  
    stev-an wrote:
    I am a user of sofara 3300tl-G3 and I want to ask what RS485 / USB communication looks like. What parameters can be observed? Is any application required.

    I will quote my question and ask for an answer again. Probably in sofars it is similarly implemented.
    prose wrote:
    There is no change here anymore
    Up is probably not, but maybe you can lower the power. I just suppose these jumpers are for that, maybe they are for something else.
  • #676 19412043
    ultimate33
    Level 10  
    Hello. I have a Sofar Solar 3.3 one phase inverter. Several photovoltaic installations were built near me. Unfortunately, now I have noticed the inverter resetting during the best production hours. The voltage exceeds 255v in the sockets and therefore it restarts. network recorder ..
    The question I have is: Can this model be done in such a way as to limit the power simply, or reduce efficiency, and not to constantly restart this inverter. If there is someone who will help, I will ask for advice ... Thank you
  • #678 19412171
    Max_O
    Level 9  
    Hello.

    I have a Sofar 8.8 ktl-x inverter and 16 Longi Solar LR4-60HIH 370w panels connected in one string. The south side of the roof has an angle of 38 degrees, on a sunny day it reaches 6.1kw. Voltage on PV1 - DC 520-560V. I am thinking about installing an additional 7 panels on the 2nd string, if it will not be enough because the operating range in this inverter is 380-850V. The panels have a voltage at maximum power Vmp 34.4V, current Imp 10.76A.
  • #680 19415350
    adamvfr
    Level 11  
    In my village there is also a problem with high voltage.
    Write what cables you have and on what lengths on the AC side from the inverter, because maybe there is a problem here, or at least part of the problem.
  • #681 19415416
    ultimate33
    Level 10  
    adamvfr wrote:
    In my village there is also a problem with high voltage.
    Write what cables you have and on what lengths on the AC side from the inverter, because maybe there is a problem here, or at least part of the problem.

    It is approximately 18-20m from the inverter to the grid connection.
    Wires with a cross-section of 6 probably .. But I went to a neighbor where there is no photovoltaic, the voltage is the same.
  • #682 19415976
    Krzychooo
    Level 16  
    ultimate33 wrote:
    Only that I went to a neighbor where there is no photovoltaic, the voltage is the same.

    :D
    And what is it supposed to be like a neighbor (as long as you measured the same phase)?
    I once included a cable calculation sheet in this post:
    https://www.elektroda.pl/rtvforum/topic3605752-390.html#19273784
    Enter your data in the cells and check the voltage drop on the cable.
    According to the instructions and general recommendations, it should not exceed 1%.
    This gives much higher cross-sections than those calculated from the load alone.
    You have to remember this.
  • #683 19416045
    ultimate33
    Level 10  
    But I did not ask about it, but whether it is possible to change the parameters on this inverter so that the inverter does not restart but works with lower efficiency, e.g.
    In any case, I will also check it .. In the inverter manual it says that up to 20m, 6 square is enough
    Up to 20m, it's 4 square meters
    Attachments:
  • #684 19416240
    Krzychooo
    Level 16  
    ultimate33 wrote:
    But I did not ask about it, but whether it is possible to change the parameters on this inverter,
    so that the inverter does not restart, but works with lower efficiency ...

    And don't you think that's not the way to go?
    This is why you put on the installation to cover an ugly roof with nice panels? Or to show off? :D
    I do not think so.
    You are to produce as much energy as you can and use it.
    The only way is to lower the nominal voltage in the network by the DSO. And fight for it.
    The road will be bumpy, but in the end I hope you will be successful, especially since you are not alone as you write.
    Since you have neighbors from PV, talk to everyone, do a "gathering" and apply to the grid operator together.
    ultimate33 wrote:
    Hello. I have a Sofar Solar 3.3 inverter one phase ..

    Well, with such power and distance, your cable is definitely not the cause of any problems.
    At cos (phi) = 0.9, there will be 16A. Copper 4 square should be OK.
    However, take an interest in the short circuit loop impedance. I don't know your net, but if it's a village with some old luck on a pole
    then we have the guilty party. The OSDs keep the voltage high on it to ensure the parameters at the end of the line.
    It hardly harmonizes with the invention of PV ... :cry:

    ultimate33 wrote:
    Several photovoltaic installations were built near me. Unfortunately, I have now observed a reset
    during the best production hours. Outlets voltage is above 255v and therefore restarts.
    I have already reported the problem to the distributor, they installed a box with a network recorder ...


    Have they already taken off and sent you "post-inspection conclusions"?
  • #685 19416271
    ultimate33
    Level 10  
    ]
    ultimate33 wrote:


    Have they already taken off and sent you "post-inspection conclusions"?


    The recorder is still hanging on the pole, and it will be there until Saturday, because they wrote that it will record data for 7 days.
    But I am afraid that it will not work, because the problem occurs in the sun, and not in such weather as it is now .. Nothing resets now .. Well, probably once yesterday when the sun went down.
    Besides, I know that it is supposed to produce max, but if there will be no way out?
    After the expertise, if it turns out that I am right, I pay nothing, and if not, PLN 150 ... I will definitely not let go ... they will ride and increase, haha. This network is cool, and they also push micro-installations ..
  • #686 19416322
    Krzychooo
    Level 16  
    Unfortunately, such a network. It was designed and made mostly for communes, when nobody thought about sending it the other way.

    That the problem is in the sun is normal, but you need to know what voltage is normally when there is no production.
    Then measure when there is before the storm (leaden clouds). If it is (and I suspect it is above 245, feel free to conclude
    for a reduction.
    The fact that OSD has a problem is probably known to everyone, but it does not change the fact that we have different times and energy from fusion on the Sun
    it is supposed to flow in the cables to the sockets, and not to squeeze in the panels ... :not:

    Fight.
    Good luck.
  • #687 19419671
    Janusz_kk
    Level 39  
    Grucha383 wrote:
    pief wrote:
    Colleagues, you can give the input to the inverter, I have Ktl-x 5.5 and v 2.01.
    Possibly where to download it.
    Thanks in advance.


    You unpack it, put the entire firmware folder on the memory card, and update it.

    There is an error in the archive, can you send a good one?

    Added after 14 [minutes]:

    I have a request, does anyone have a service in Polish for 3F sofara? because there is nothing on this Polish side.
    I mean the AC differential, which the manufacturer recommends, because I read the neighboring thread about the fronius and someone jumped out that it must be type 'B' and they cost some sick money. Interestingly, on the forum of fronius, they write that ordinary AC is enough, but at least 100mA.
  • #688 19419940
    toolpusher
    Level 23  
    I have a Sofar and I didn't give a differential.
  • #689 19420017
    Cytro12
    Level 26  
    Sofar has RCMU, so you can but do not have to use the difference. Actually, it depends on the conditions at the place of installation.
  • #690 19420718
    Janusz_kk
    Level 39  
    I have standard terms and conditions :) basement and 3m cable to the main switchboard. They can connect to the basement RCD or give a separate one, but if it is to be 100mA, it must be separate.
    Cytro12 wrote:
    Actually, it depends on the conditions at the place of installation.

    What conditions require an RCD?
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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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