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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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  • #931 19686935
    Sapient
    Level 8  
    I saw the movie, but I meant more about the application itself, its accuracy, refreshing, comparison, for example, with the E Counter
    I gave up the purchase due to the lack of information, especially the official ones.
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  • #932 19687741
    edekzelian
    Level 10  
    marwi123 wrote:



    Only a dedicated solarman counter for almost 1k PLN and it will be in one application


    So it is the same as the pvmonitor set: /
  • #933 19698391
    Sebus504
    Level 12  
    Hello, I don't want to start a new topic. Has anyone changed the modbus address? After changing the address, the data reading is via RS485, but the inverter has lost communication with the wifi module. I get the IP address, you can log in, but no parameters are displayed. Is it possible to set an address other than 1 in such a way that the wifi works properly?
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  • #934 19699218
    dianka36
    Level 2  
    Hello everyone, please help I'm a layman I have to put on TWIN SILVER M182.00 MM400-410Wp9THGENHIEFF panels, the power is to be 6.97 kW, the inverter has been proposed to me SOFARSOLAR Datasheet 3.3-12 KTL-X ver.PL and my question is what power there should be an inverter, I have a power of 7kW. I am asking for help, I have to sign a contract and I do not know the subject, I must fully believe everything that the sales representative tells me. Is this kit good. If this topic was discussed, I did not read or understand what I am sorry for. Thank you for your help.
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  • #935 19699391
    Janusz_kk
    Level 39  
    Well, get some training, read topics here on the electrode :)
    dianka36 wrote:
    my question is what power the inverter should be about, I have a power of 7kW

    It can be the same or weaker.

    dianka36 wrote:
    I am supposed to put on TWIN SILVER M182.00 MM400-410Wp9THGENHIEFF panels,

    Will you wear them yourself? C. Will the company do it to you?

    dianka36 wrote:
    the inverter has been proposed to me SOFARSOLAR Datasheet 3.3-12 KTL-X ver.PL

    Rather, you got info about the inverters series, for your PVs as you write 6.97 kW the inverter should be about 15-20% less power, or about 5.8 kW .
    Moderated By krzysiek7:

    I corrected the spelling of the power units and please write like that next time.
    3.1.13. Take care of linguistic correctness and follow the rules of netiquette. Do not post messages that make it difficult to deduce what their author wanted to convey.
    3.3. The user is obliged to immediately follow the moderator's instructions.

  • #936 19699606
    dianka36
    Level 2  
    Thank you very much for the information, I will be finding a company, so I got a series of inverters and the trader did not tell me what it should be and that is why I asked a question to be sure of what I would get and in the series I have 3.3KTL-X / 4.4KTL-X / 5.5KTL-X / 6.6KTL-X / 8.8KTL-X / 11KTL-X / 12KTL-X is the best one in your opinion. And why do they want to install the inverter outside the building and not inside - is it about fire regulations or something else,
  • #937 19699702
    Janusz_kk
    Level 39  
    dianka36 wrote:
    And why do they want to install the inverter outside the building and not inside - it is about fire regulations or something else,

    ask them :) remember that it should not be shining in the sun or raining.

    dianka36 wrote:
    and in the series I have 3.3KTL-X / 4.4KTL-X / 5.5KTL-X / 6.6KTL-X / 8.8KTL-X / 11KTL-X / 12KTL-X which is the best in your opinion

    I think 5.5 kW is enough for you. Why overpay, unless 6.6 will be at the same price, and if not, then you will switch to 6.6 :) there is a description in this thread.
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  • #938 19699813
    dianka36
    Level 2  
    Thank you very much, Mr. Janusz, for your help, information, and explanations. The trader offered me the cheapest version; I will negotiate for a better one. I will start with 6.6; maybe I will negotiate something. Good night.
  • #939 19701619
    edekzelian
    Level 10  
    Janusz_kk wrote:
    dianka36 wrote:
    And why do they want to install the inverter outside the building and not inside - is it about fire regulations or something else,

    ask them :) remember that it should not be shining in the sun or raining.

    dianka36 wrote:
    and in the series I have 3.3KTL-X / 4.4KTL-X / 5.5KTL-X / 6.6KTL-X / 8.8KTL-X / 11KTL-X / 12KTL-X which is the best in your opinion

    I think 5.5 kW is enough for you. Why overpay, unless 6.6 will be at the same price, and if not, then you will switch to 6.6 :) there is a description in this thread.

    and 6.6KTL-X at 8.8 is also possible? :)
  • #940 19702051
    marwi123
    Level 13  
    edekzelian wrote:
    Janusz_kk wrote:
    dianka36 wrote:
    And why do they want to install the inverter outside the building and not inside - it is about fire regulations or something else,

    ask them :) remember that it should not be shining in the sun or raining.

    dianka36 wrote:
    and in the series I have 3.3KTL-X / 4.4KTL-X / 5.5KTL-X / 6.6KTL-X / 8.8KTL-X / 11KTL-X / 12KTL-X which is the best in your opinion

    I think 5.5 kW is enough for you. Why overpay, unless 6.6 will be at the same price, and if not, then you will switch to 6.6 :) there is a description in this thread.

    and 6.6ktlx at 8.8 is also possible? :)


    One person in this thread praised that it is possible. Unfortunately, no more info. Maybe the chokes from 6.6 to 8.8 will fly again ....
  • #941 19702052
    marwi123
    Level 13  
    edekzelian wrote:
    Janusz_kk wrote:
    dianka36 wrote:
    And why do they want to install the inverter outside the building and not inside - it is about fire regulations or something else,

    ask them :) remember that it should not be shining in the sun or raining.

    dianka36 wrote:
    and in the series I have 3.3KTL-X / 4.4KTL-X / 5.5KTL-X / 6.6KTL-X / 8.8KTL-X / 11KTL-X / 12KTL-X which is the best in your opinion

    I think 5.5 kW is enough for you. Why overpay, unless 6.6 will be at the same price, and if not, then you will switch to 6.6 :) there is a description in this thread.

    and 6.6ktlx at 8.8 is also possible? :)


    One person in this thread praised that it is possible. Unfortunately, no more info. Maybe the chokes from 6.6 to 8.8 will fly again ....
  • #942 19702115
    Janusz_kk
    Level 39  
    edekzelian wrote:
    and 6.6ktlx at 8.8 is also possible?

    From what I saw, the photos are not, the other larger chokes are from 8.8 to 11Kw, and probably more transistors.
  • #943 19702195
    marwi123
    Level 13  
    Janusz_kk wrote:
    edekzelian wrote:
    and 6.6ktlx at 8.8 is also possible?

    From what I saw, the photos are not, the other larger chokes are from 8.8 to 11Kw, and probably more transistors.

    Up to 12ktlx. Somehow everyone forgets about him?
  • #944 19704916
    binio1111
    Level 9  
    Colleagues promise to install PV and ultimately it will be sofar 8.8 ktl-x + 27 panels, 370W each. (two loops 14 and 13). Corab encor slimmer panel. I 10.91A: V 33.95; resting 41.72V
    Will 8.8 pull. or to assume a stronger one?

    I read the whole thread and I was stupid. Supposedly, the panels should be oversized in relation to the inverter because it is more advantageous (that's what they say everywhere) and here I can see that then people switch the sofars to "stronger" because they cut the power on sunny days.
    How to oversize these panels or give a more powerful inverter?
    Installation flush to the south, roof angle 40 °
  • #945 19704981
    edekzelian
    Level 10  
    Janusz_kk wrote:
    edekzelian wrote:
    and 6.6ktlx at 8.8 is also possible?

    From what I saw, the photos are not, the other larger chokes are from 8.8 to 11Kw, and probably more transistors.


    Thank you! It will be puzzling then.
  • #946 19705088
    prose
    Level 36  
    From 6.6 to 8.8 do not combine other chokes are at the AC output.
  • #947 19705961
    mentos2504
    Level 11  
    binio1111 wrote:
    Colleagues promise to install PV and ultimately it will be sofar 8.8 ktl-x 27 panels, 370W each. (two loops 14 and 13). Corab encor slimmer panel. I 10.91A: V 33.95; resting 41.72V
    Will 8.8 pull. or to assume a stronger one?

    I read the whole thread and I was stupid. Apparently, the panels should be oversized in relation to the inverter because it is more advantageous (that's what they write everywhere) and here I can see that then people switch the sofars to "stronger" because they cut the power on sunny days.
    How to oversize these panels or give a more powerful inverter?
    Installation flush to the south, roof angle 40 °

    In your case, the 8.8 inverter is the best solution. Sofara pays off to oversize to max. 110% of the nominal power of the inverter. You have 104%, which is perfect.
  • #948 19706280
    binio1111
    Level 9  
    104%? 27 × 370W in panels is 9990W. It's closer to 14%
    I am still puzzled by the oversizing of the panels in relation to the inverter. Both sofars (8.8 and 11) have the same "start" parameters
  • #950 19706766
    binio1111
    Level 9  
    This article shows that if I had installed the sofara 11 (i.e. nominally 10), I would not have done much harm.
  • #951 19708180
    mentos2504
    Level 11  
    The inverter 11 obtains its full power in the voltage range 480-850V. You have respectively: 13 panels x 34 V = 442 V and 14 x 34 = 476V. So the inverter will not run at its full capacity. As I wrote above, the 8.8 inverter will be better, because it gets full power from 380V.
  • #952 19708325
    binio1111
    Level 9  
    Indeed. I missed this parameter. So it goes 8.8
  • #953 19708445
    damian1987rr
    Level 9  
    Hello, is the following set ok?
    11ktlx sofar inverter
    18 jinko tiger pro 540W panels
  • #954 19708933
    binio1111
    Level 9  
    According to what you give is 8.8, not 11
    Just like the posts above, my colleagues gave it for me.
  • #955 19709101
    lary504
    Level 12  
    I would take 11 because the panels are bifacial, why cut the production. And two currents if the sofar is G3 and it must also be pinned, or one string and connected in parallel to two inputs.
  • #956 19715675
    ter12
    Level 11  
    ter12 wrote:
    Hello
    I have had an installation with HYD-5KTL-3PH for several days. Yesterday, after the night, it did not switch to the power production mode, it waited for itself - after the restart, everything started to work - no errors. This morning I check a dark display, nothing works, the inverter is dead ... The question is, are these Sofars sitting down from nothing? I suppose I have a 10-year warranty, but if it would burn out from time to time, can it be replaced with one with similar parameters?

    3 weeks have passed and I am still without an inverter. Apparently, it is not enough time to repair / replace NEW equipment for 13,000 ... Is it possible to "force" replacement equipment for the time of repair?
  • #957 19720824
    caged
    Level 10  
    Hello.
    I do not want to start a new topic, that's why here.
    I bought a SOFAR INVERTER 6.6KTLX-G3 THREE-PHASE, I have a dilemma and would like to consult professionals, I bought 14 pcs of Longi Solar 455W LR4-72HPH-455M panels and I am thinking about connecting, whether to connect in one string or divide into two, panels arranged from the south on one roof slope without shadows. Maybe some optimal solution, equal or unequal thongs? I am asking for some tips.
    The parameters of the panels in the attachment and in the photo.


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


    Regards. [img-3]
    Attachments:
    • Hi-Mo4m_LR4-72HPH_PL_Longi_72HPH_430-460_karta_katalogowa_01[1].pdf (378.6 KB) You must be logged in to download this attachment.
  • #958 19720855
    Janusz_kk
    Level 39  
    Connect into one string, the max voltage will be 795V, so in the inverter, the inverter inputs (2 strings) should be connected in parallel with adapters due to the higher current.
  • #959 19720935
    rokbok
    Level 39  
    Janusz_kk wrote:
    the inputs in the inverter (2 strings) should be connected in parallel with adapters due to the higher current.


    In one string, the current will not change, so why connect the MPPT inputs in parallel ;) .

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

    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
  • #960 19720945
    lary504
    Level 12  
    If you connect the inputs in parallel, the current will be half the input. Although the g3 so far is probably 13A, it will not exceed.
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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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