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

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How reliable are Sofar inverters for an around-8 kW PV installation, and what problems or failures do users report?

Users report mostly acceptable results: one 6.6KTL-X had no problems for over a year, and another 8.8KTL-X owner said a firmware update to v2.20 removed the old clipping around 8 kW and let the inverter reach full peak power [#18112697] [#18662870] [#19158337] The most common problems in the thread were not outright inverter defects but installation/configuration mistakes: too many panels in one string or the wrong input mode caused DC overvoltage errors such as PvOVP, BusOPV or permanent fault, and the cure was to wire the strings correctly and keep each MPPT within its limits [#18322870] [#18323108] [#18359020] [#18360610] [#18699492] Another recurring issue was grid overvoltage: users saw ID01/Grid OVP shutdowns when mains voltage rose to about 253 V, and one case reached 280 V at the customer side; the inverter was behaving as designed in those cases [#18624602] [#18665849] A few users also mentioned Wi‑Fi/software quirks and awkward warranty handling, with the installer, seller, distributor and Sofar service bouncing responsibility between each other [#18306997] [#18322870] [#18323064] [#18331261] [#18772451] There was at least one real hardware failure report, where an 8.8KTL-X tripped AC overcurrent after about a month and then would not restart, so the unit had to go through warranty [#18771167]
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  • #691 19422780
    grzes601
    Level 14  
    The owned 10kW SOFAR while waiting for the sun (night) generates negative reactive power on each of the phases. It is not a little because it is about 35 var.
    This way we get 1.5kvar during the winter period during the night
    The situation improves when the inverter feeds more than 100-120W into the grid.
    The measurement was made using the ZAMEL MEW-01 energy meter
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  • #692 19422969
    theo33
    Level 27  
    It would be correct, also zamel and depending on the production of capacitance from 1.5 to 2.3 kVarh per day, from 01.12 2019 it is 943.9772 with the produced 7091.4684 and the collected active 18.2524 and the collected reactive 0.03

    Do you have data on how much your inverter consumes active daily? and possibly how much inductive in relation to the active produced
  • #693 19424039
    grzes601
    Level 14  
    ZAMEL measures for me on the main wires leading to the PGE meter.
    I temporarily disable the inverter's access to the grid (230V) when the output drops below 100W because the negative reactive output is around 30-40 var or more on each phase.
    Maybe someone knows if the software has an effect on reactive power. This is especially true when the inverter has a low production capacity.
    I am thinking of installing a contactor controlled by the intensity of lighting.
    With an inverter production level of 200W, the reactive power level is very decent and skipable.
    It is possible to get voltage on MPPT from 485 and make connection and disconnection from the network dependent.
    I did not take any other measurements.
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  • #694 19424072
    3301
    Level 34  
    Do you have a PV installation in your company and you pay passive?
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  • #695 19424674
    ultimate33
    Level 10  
    Krzychooo wrote:
    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.

    Man, I noticed that in the bright sun, before it restarts, this voltage 254-5 ... But when the inverter restarts and I do not work, it is 242-247 ... Maybe something with this inverter, however ... I know that the inverter raises the voltage ... so much?
  • #696 19424698
    Krzychooo
    Level 16  
    ultimate33 wrote:
    I know that the inverter raises the voltage ... But how much?

    Do not pick on the inverter, it's OK.
    For me, at 8.8 kW it raises about 7 V.
    This is the result of the impedance of the entire circuit to the trafo, so check what you have from the meter at home.
    I have 0.625 ohms on all phases, almost equal. Distance from the transformer is about 380 m.
  • #697 19424727
    3301
    Level 34  
    ultimate33 wrote:
    Krzychooo wrote:
    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.



    Man, I noticed that in the bright sun, before it restarts, this voltage 254-5 ... But when the inverter restarts and I do not work, it is 242-247 ... Maybe something with this inverter, however ... I know that the inverter raises the voltage ... so much?



    As a colleague wrote earlier, the voltage rises due to the impedance, if theoretically it was zero, nothing would increase, based on your observations, because if the inverter is not working, the voltage is lower by 10V, you have too much impedance, too small cross-section from connections all the way to the inverter.
  • #698 19424764
    Krzychooo
    Level 16  
    3301 wrote:
    you have too high this impedance, too small cross-section from the connection to the inverter.


    ... but you are only responsible for the path from the meter to the inverter , the rest is OSD!

    If you check your cable and it's OK, then go ahead and apply for a loop impedance check with you.
    If it is too big, it will be a problem, but for OSD, it is a little consolation.
    They checked for me right after the first signals. Later I checked again "privately".
    Sometimes (with overhead lines) it is enough to tighten the terminals on the wires.
  • #699 19424993
    3301
    Level 34  
    Actually, it is not entirely from the meter, usually from the operating limit, and sometimes the limit is a fuse in the cable connector and sometimes the terminals on the stand at the overhead connection
  • #700 19440158
    maks197
    Level 10  
    Currently, I do not recommend Sofar, every change of settings blocks production and requires generating a new software.
    I bought from a seller in China who cheated me twice, the first one he sold me a sofar for the Chinese market, the second one didn't pay any taxes, now the sofar producer was washing his hands.
  • #701 19440189
    grzes601
    Level 14  
    maks197 wrote:
    Currently, I do not recommend Sofar, every change of settings blocks production and requires generating a new software.
    I bought from a seller in China who cheated me twice, the first one he sold me a sofara for the Chinese market, the second one didn't pay any taxes, now the sofar producer was washing his hands.

    I don't understand your statement.
    I have chinese versions. I'm not complaining. Nothing's getting stuck. It is true that Sofar works stably when it has a memory card inserted. I am thinking of limiting the output power (menu 1.16). When the card is inserted, the inverter, after turning off and lifting up, "keeps track of" the set output power.
  • #702 19440201
    Janusz_kk
    Level 39  
    maks197 wrote:
    I bought from a seller in China who cheated me twice, the first one sold me a sofara to the Chinese market, the second didn't pay any taxes,

    Another example of not buying anything> $ 100 in China. A 8.8Kw Sofar in Poland costs ~ 4-4.2 thousand, I know because I just bought it myself, is it profitable to risk buying in China?
  • #703 19440370
    prose
    Level 36  
    maks197 wrote:
    Currently, I do not recommend Sofar, every change of settings blocks production and requires generating a new software.
    Nothing is blocking it, but you need to configure it, and changing the software, as in every inverter, is recommended, I have a sofara and I praise it, and straight from China, I would not even buy a PWM controller. and second, don't expect someone to pay you taxes.
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  • #704 19440543
    Cytro12
    Level 26  
    Sofar is rapidly aging technologically, they installed it a lot because it is cheap and has a display like phones with keys, and stereotypes reign in us, the larger the display is better and the more envy :) People buy with their eyes not with their minds.

    The purchase of a normal inverter in China or in Poland should not differ because it is the same device, the difference is only in the software, and often these inverters for the Chinese market have better parameters (settings in the software) because the regulations are different and a different part of the world (the sun).

    On the Russian YT, they often import inverters from China and start them up, it's worth taking a look.
  • #705 19440567
    toolpusher
    Level 23  
    maks197 wrote:
    Currently, I do not recommend Sofar, every change of settings blocks production and requires generating a new software.
    I bought from a seller in China who cheated me twice, the first one he sold me a sofara for the Chinese market, the second one didn't pay any taxes, now the sofar producer was washing his hands.


    Your statement is on the same level as a kid from middle school would write. You bought something in China because you had a snake in your pocket and now you have a grudge against everyone but not yourself. Why didn't you buy from the official distribution with a 10-year warranty? Since when is the reseller / exporter to pay the import charges and tax?
  • #706 19443612
    jrucin
    Level 2  
    Good day. I just changed the jumpers on my Sinker 4.4KTL-X on the SW3 switch, originally they were 1111, changed to 1000, but it didn't work. The inverter then works with a constant maximum power of 4.04 kW - 4.05 kW. The power did not change to 5 kW in the settings on the display. I have 2 strings of 8 330W panels in total 5280 kWp and on nice sunny days from 9 to 12.30 I have a production cut to 4.04 kW. I would like to add that the panels are facing southeast (orientation is about 135 degrees). I already have an experienced installer for overvoltage for 2 strings with 7 panels each and I will connect the other two to the Enwertech ETV560 microwave inverter. But when I found this thread, I thought that I would settle the matter by changing the jumpers, but it did not work. Toolpusher, maybe you have a hint what else to change so that it jumps to 5.5?
  • #707 19443728
    toolpusher
    Level 23  
    Turn off the inverter as soon as possible and change the jumpers to the correct position. For 5.5 it should be 1110. And where did you get the value 1000, maybe somewhere it is written with an error? Provide the source so that someone else would not make this mistake.
    On the other hand, as you saw that the inverter did not switch to 5kw, you should not let it go.
  • #708 19443752
    grzes601
    Level 14  
    Good day.
    What may be the reason why the KTL-X (10kW) inverter works with the output power above 10kW.
    Sometimes on very sunny days it reaches 10,600 and once I noticed even 11,000.
    The value in menu 1.16 is now 100%
    It is different when I declare 99% in menu 1.16. Then the generated power does not exceed 10050W.

    I have the impression that after turning off the inverter, it loses the output power settings. After entering the value in 1.16, 99% maintains the level of 10kW.
  • #709 19443763
    toolpusher
    Level 23  
    grzes601 wrote:
    Good day.
    What may be the reason why the KTL-X (10kW) inverter works with the output power above 10kW.
    Sometimes on very sunny days it reaches 10,600 and once I noticed even 11,000.
    The value in menu 1.16 is now 100%
    It is different when I declare 99% in menu 1.16. Then the generated power does not exceed 10050W.


    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.
  • #710 19443772
    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.
    The trouble is, I wouldn't want to jump above 10000W for political reasons. Looks like I'll have to enter 99% in menu 1.16.
    I am concerned about the feeling of losing the record.
    Does Sofar save the entered settings to the SD?
  • #711 19443790
    toolpusher
    Level 23  
    It seems to me that the value of 1.16, i.e. power derating, is not saved on the SD card. But, for example, the value of 1.14, which is insulation, yes.
  • #712 19443808
    Cytro12
    Level 26  
    The maximum power is here the apparent power and the nominal power is the smaller, continuous operation at maximum power shortens the service life, so not entirely right, unless the inverter is not the largest in the series and has a power reserve. It would also be necessary to refer to how much the reality corresponds to what Sofar writes in the data.
  • #713 19443835
    grzes601
    Level 14  
    toolpusher wrote:
    It seems to me that the value of 1.16, i.e. power derating, is not saved on the SD card. But, for example, the value of 1.14, which is insulation, yes.

    Can I ask for a sample configuration file with an indication of the waiting time for startup, i.e. 60s
    I am very intrigued by reducing this time to 30 seconds
  • #714 19443920
    maxdax
    Level 11  
    Hello
    Has anyone changed the KTL dipswitch 6.6 to 8.8 ?? Will it work?
  • #715 19443981
    prose
    Level 36  
    maxdax wrote:
    Hello
    Has anyone changed the KTL dipswitch 6.6 to 8.8 ?? Will it work?

    6.6 and 8.8 are a different group.
  • #716 19444018
    toolpusher
    Level 23  
    As a colleague prose wrote 6.6, only down can be moved.
  • #717 19444562
    jrucin
    Level 2  
    toolpusher wrote:
    Turn off the inverter as soon as possible and change the jumpers to the correct position. For 5.5 it should be 1110. And where did you get the value 1000, maybe somewhere it is written with an error? Provide the source so that someone else would not make this mistake.
    On the other hand, as you saw that the inverter did not switch to 5kw, you should not let it go.


    Thanks for your help. I had time to relocate the inverter just before we left and only now came back. I changed the jumpers according to your recommendations and it is 5kW, the sun looked out from behind the clouds and I saw on my inverter for the first time since March 2020, i.e. from starting the installation 4.93 kW. With the jumpers 1000, everything ran smoothly and the inverter behaved like 4.4. The attached PrtSc with the source from the electrode where the user prose posted info about the setting of the jumpers.
    Thanks again for the quick help. :spoko:
    Attachments:
    • Dok1.docx (575.27 KB) You must be logged in to download this attachment.
  • #718 19444613
    toolpusher
    Level 23  
    It was like that at the beginning but it has been corrected long ago in another thread. This is what happened. The topic is closed, I don't know if I can change my post - if so, buddy, ask for improvement.
  • #719 19444692
    jrucin
    Level 2  
    Well, I was unlucky enough to come across this unadjusted one, but it all ended well. I have a question where can I find the settings for the jumpers 3.3 and 6.6, but to be 100% sure?
  • #720 19444729
    prose
    Level 36  
    @toolpusher I have corrected 5.5 1110.

    Added after 14 [minutes]:

    Correct, the sw3 switch in the 1234 positions usually has a power down (1) power up (0) so we have settings for the power based on the received photos: 3.3kW 1001, 4.4kw 1111, 5.5kw 1110, 6.6kW 1101, 8.8kW 1100 , 11kW 1011,
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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.
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FAQ

TL;DR: Field owners report 0–20 % daily energy loss when Sofar inverters trip on 253 V grid peaks; “set Country Code 12 for Poland and the problem goes away” [Elektroda, 3301, post #18624621] Why it matters: one menu setting often fixes most unexpected shutdowns without replacing hardware.

Quick Facts

• Max. DC input voltage 1000 V & MPPT window 240-850 V (Sofar 8.8KTL-X manual [Uri, #18921613]) • Recommended DC/AC oversize ratio ≤ 1.2 : 1 for KTL-X models [Elektroda, BikeBarian, post #18360391] • Country Code list: PL = 12, DE = 07, NL = 05 [Elektroda, Defence & 3301, post #18851696] • Typical firmware: V2.30 (increases AC limit from 4.0 kW to 4.4 kW on 4.4KTL-X) [Elektroda, prose, post #19034268] • Service e-mail: service.pl@sofarsolar.com; hotline +48 22 123 98 58 [Elektroda, AT PRO, post #18772451]

How reliable are Sofar inverters in everyday use?

Most 6–9 kW owners report trouble-free work for 1–3 years [Elektroda, iborkim, #18112697; Elekt...

Which menu code should I select for Polish grid parameters?

Use Country Code 12 (PL). It lifts the over-voltage trip to 253 V/10 min and 264 V/1 s, matching Polish NC-RFG limits [Elektroda, 3301, post #18851696] Selecting 07 (DE) raises the limit to 264 V but violates declaration of conformity.

My inverter shows ID01 ‘GridOFP’ and stops at noon—what now?

Measure L-N voltage; if it rises above 253 V, ask the DSO to lower tap settings or move PV to another phase. Until then, temporarily change Country Code to DE (07) or install a 230 → 220 V autotransformer [Elektroda, MariuszFEG, post #18623709]

What causes PvOVP / BusOPV errors on 4KTLM-G2 units?

Voc exceeds 600 V in cold sun. Split the 15-panel string into two of 8 + 7 or use a 3-phase inverter that accepts 1000 V DC [Elektroda, noja102, post #18323557]

Is the MPPT Scan function worth enabling?

Enable only when partial shading occurs; it rescans the IV curve at user-set intervals. Service says it "improves harvest under shade" but reduces output 1–2 % on clean arrays [Elektroda, 3301, post #18622124]

How do I update Sofar firmware myself?

  1. Copy the /firmware folder to the SD card.
  2. Insert card, choose Menu → 5.Software Update, enter password 0715.
  3. Wait until ‘Update DSP1 OK’, ‘DSP2 OK’, ‘FUSE OK’, then reboot [Elektroda, Grucha383, post #19029218]

The display boots for one second at dawn—is that harmful?

No. The capacitors charge when DC rises above 180 V, then discharge if current is < 20 mA; this soft-start repeats without affecting lifespan [Elektroda, rydzyk673, post #19035241]

Why does Solarman show 0.9 A per phase even at 0 W?

Firmware ≤ V2.30 reports reactive standby current as active. Real clamp-meter reading is ~0.2 A; ignore the dash-board figure until a patch arrives [Elektroda, wilk125, post #19038447]

Edge case: can the inverter fail after a breaker trip?

Yes—one 8.8KTL-X died after a 16 A AC breaker opened; display stayed dark despite correct DC voltage, requiring warranty swap [Elektroda, gotycki1, post #18771167]

How to auto-run a 1.5 kW boiler only on surplus PV?

Install a PR-energised relay with the inverter’s CT loop; set closure above 4.5 kW export so the heater engages only in excess production [Elektroda, 3301, post #19053070]
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