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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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  • #1441 20528972
    wddd
    Level 11  
    Hello
    I had the same problem, previously described this problem. I have been in contact with the service about this for over two months. They tried to fix something remotely, but they couldn't. I was told not to run the inverter even for a few days, which I lost a lot because it was in the summer (last year)
    I ended up getting a new one. When I received the new inverter from the courier, I found it damaged.
    Regards
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  • #1442 20528983
    Rybus85
    Level 23  
    I was afraid that the inverter might have to be replaced. Fortunately, the company that founded me is an official distributor from sofara, so they guarantee repair or replacement in 48 hours. Will have to check back after Christmas.
    Damn so much waiting for power (installed in February, Enea has just replaced the meter) and here are such eggs ^^ But all in all Easter, eggs must be :D
  • #1443 20530525
    Komodo
    Level 12  
    Rybus85 wrote:
    Well, I guess there was a problem with the inverter. It worked ok for two days. Yesterday and today the inverter gets up in the morning at /- 6 30, jumps to 20W and drops to 10W and so it stands with production. I just noticed it around 10 o'clock yesterday. After turning it off and on, it immediately started with high production.

    This is exactly the same problem I had, you have described everything two pages earlier. Updating the inverter firmware helps.
  • #1444 20530529
    Rybus85
    Level 23  
    Komodo wrote:
    Rybus85 wrote:
    Well, I guess there was a problem with the inverter. It worked ok for two days. Yesterday and today the inverter gets up in the morning at +/- 6 30, jumps to 20W and drops to 10W and so it stands with production. I just noticed it around 10 o'clock yesterday. After turning it off and on, it immediately started with high production.

    This is exactly the same problem I had, you have described everything two pages earlier. Updating the inverter firmware helps.

    Where did you download the updates from? I think I just got the 360 firmware version.
  • #1445 20530924
    tig2
    Level 11  
    >>20189924
    I confirm the 5 kW version, although the Fox clone ...

    After changing from 5 to 6kW, it cuts off for 6 and actually lets 5.7kW into the network.
    When presented at 10kW, it falsifies the indications and thus the production and also the maximum cut-off.
    It indicates production, e.g. 5 kW in real sends 2.5 kW, so we gain nothing, unless to show off the production 😁 this one is getting cosmic.

    The shunts on the AC side are 10A, I think that they primarily condition, although not several hours (no sun) work on the production of 6 kW, the components are barely warm.
    I wonder if you can buy a motherboard for a more powerful version
  • #1446 20531009
    arek1313
    Level 12  
    And how to interpret the indications from the display when I have, for example, 6.77 kW of production? (version 6.6)
    The cut-off is not even in the graph either.
  • #1447 20531027
    tig2
    Level 11  
    If you can't see the cut, that's what it produces,
    for me in the previous generation 6 it was able to 6.6kW, now it cuts evenly
  • #1448 20531249
    arek1313
    Level 12  
    This is another positive in the G2 series.
    A friend has a G3 8.8 and I was very surprised how hot it is! And it buzzes and buzzes when heavily loaded - I asked if this active cooling was so noisy :) In my opinion, it's G3 = Growatt, smaller size, smaller radiator, a bit of a step back in my humble opinion.
  • #1449 20531282
    tig2
    Level 11  
    In the upper part of the motherboard there is a mini fan, it looks like it was additionally added, it can make noise
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  • #1450 20531314
    arek1313
    Level 12  
    tig2 wrote:
    In the upper part of the motherboard there is a mini fan, it looks like it was additionally added, it can make noise


    Oh see, until I look at it with him.

    The G2 seems to me to be such an old-fashioned, "armored" construction. Just like Afore, and G3 and Growatt are a different school.
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  • #1452 20534163
    m2tk
    Level 13  
    >>20531282

    For me it was noisy after putting it on, after the firmware update it stopped being audible. G3.
  • #1453 20534191
    Rybus85
    Level 23  
    After reporting the problem that the inverter does not get up in the morning and produces only 10W, I received information that there will be a remote update of the inverter. After several dozen minutes, I was in the corridor and saw that he was finishing the updates. The inverter produces normally, the green light is normal, etc., but when I turned on the application to check what version of the software appeared, I see that it displays an alarm. Going through the website to read the alarm (in the solarman application I couldn't find it) I have information Software version from not constisten. So the software version is not consistent.
    I've already contacted you about this, I'm curious about what's next.
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  • #1454 20536040
    Rybus85
    Level 23  
    It seems to be ok. The inverter works normally, there are no errors and got up in the morning without a problem. So for now, the update seems to have worked.
  • #1455 20536751
    JEDD
    Level 29  
    Do your 8.8 KTL-X's cut power pretty much even with 8.8kW? I have soft 3.02, and originally it was 2.20. I replaced the inverter with my installer with 6.6KTL-X. The replaced 8.8 was not new and had worked for over a year. In history, I saw that it had a production capacity of over 9kW. I have 9.13kWp on the roof and I see that it hasn't produced more than 8.88kW at peak since last year, and it seems to me that the panels give a little more in the current weather. Previously, on 6.6 with soft 2.50, when there was 7.22kWp on the roof, the max it produced was 6.78kW.
  • #1456 20536759
    AT PRO
    Level 25  
    Maybe the previous user moved the jumpers and increased the power.
  • #1457 20536965
    Janusz_kk
    Level 39  
    JEDD wrote:
    I have 9.13kWp on the roof and I see that it has not produced more than 8.88kW in peak since that year,

    And it will not produce because the panels will not give that much, it is the maximum power in optimal conditions, i.e. the right sun and 25 degrees on the panels, and the panels in the sun never have so much now, while in the frost (winter) the sun is too weak again. I know because I have 9kWp on the roof myself.
  • #1458 20536973
    k_pec
    Level 34  
    JEDD wrote:
    and it seems to me that the panels give a little more in the current weather.

    Based on what do you think so?
  • #1459 20537064
    JEDD
    Level 29  
    It's not about full sun, because in such weather it reaches about 7.5kWp, but when we have it now, it's about 15 degrees outside and when the sun comes out from behind the clouds, the inverter reaches 8.8kWp and that's it, and because I have the Tigo TAP system with CCA, I can see how much comes out of one panel, there are over 380W out of the declared 380Wp, and it happened that they pushed out a little over 400W.
  • #1460 20538197
    xury
    Automation specialist  
    I had a maximum peak power of 5200W on twelve 405W panels, so 340W more than the nominal one. That is, a power greater than nominal is possible. But this is an extremely rare occurrence. In addition, the maximum AC power is reduced by the DC to AC conversion losses.
  • #1461 20538209
    JEDD
    Level 29  
    xury wrote:
    I had a maximum peak power of 5200W on twelve 405W panels, so 340W more than the nominal one. That is, a power greater than nominal is possible. But this is an extremely rare occurrence. In addition, the maximum AC power is reduced by the DC to AC conversion losses.


    That's right, but according to the 8.8 data sheet, it has an efficiency of 98%. According to the calculations, in a place where there was, for example, 8.87kW, 9265W came out of the panels, which gives an efficiency of about 95%, the inverter gave 5% instead of 2% to the radiator instead of AC. The point is whether someone has the same, with a similar SW version or just the update "broke it" (after all, on 2.20 there were more :) )
  • #1462 20538467
    lukaszgondzia
    Level 1  
    >>19946577
    I have the same problem. But when I change the name of the file, it does (2), because there is already one with this name.
  • #1463 20538522
    Rybus85
    Level 23  
    Anyone know where these results come from? The installation was connected to the network last Tuesday and has only been working since that day. Installed at the end of February and has not been run. So where did he get 131kWh? This 92kWh is the actual value since the installation has been commissioned. SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
  • #1464 20538819
    galica01
    Level 16  
    Everything indicates that you have already done 131kWh and these 92kWh have been since the application was launched, this is how it works in the sofar. It is always worth while starting the installation to make the app right away so that there are no such flowers. Show the monthly chart for this month where you can see the individual days.
  • #1465 20539282
    Rybus85
    Level 23  
    And it is impossible. Established at the end of July and has not been launched. Nothing on the charts. The inverter was new. They opened a cardboard box for me. And in fact, it was turned on only for the time of testing by the fitters if everything is ok and that's it. Until the meter was replaced, it was not turned on later, i.e. until the beginning of April. That's why I asked why such strange indications.
  • #1466 20539352
    wddd
    Level 11  
    Hello
    When I fired the whole set at the end of March last year, the Sofar 3.3 1f and enjoying the fact that it all worked so beautifully, I checked several times a day how much it produced for me. After a few weeks, when something did not agree, I wrote down how much it produced on that day and the total it turned out that several kWh arrived after the night 😃 (not always and these values were different).
    So I reported this problem to the service, they said that something is wrong with time and uploaded new software. For some time it was ok, and then (as I wrote an earlier post) the inverter did not want to turn on in the morning. When I turned the power off and on, whether AC or DC, the inverter worked properly. Regards
  • #1467 20539356
    Rybus85
    Level 23  
    It's nice stuff they have with the software ^^
  • #1468 20539634
    toma1981
    Level 12  
    Gentlemen, I have a 5500w installation and the inverter does not show more production than 4000w or is the sun too weak and you have to wait until May or something wrong with the installation I have done because I am not getting full power so far 5500w.
  • #1469 20539991
    m2tk
    Level 13  
    With 10kWp modules, the peak sometimes reaches 12kW DC, mainly when it's cold and the sun comes out from behind the clouds. But the factory 10kW is often exceeded in March, April.
  • #1470 20540046
    galica01
    Level 16  
    toma1981 wrote:
    Gentlemen, I have a 5500w installation and the inverter does not show more production than 4000w, is the sun too weak and you have to wait until May or something wrong with the installation I have done because I am not getting full power 5500w so far.


    Write what angle of the panels, what direction, how long you have installations or entire panels in one direction. The warmer the efficiency drops, so in May I wouldn't count on the biggest peaks.
    Such questions are pointless, even more so without a detailed description of the installation, it's like asking why I have a max speed of 240 km/h on the car's odometer, the car only goes 200 km/h

    m2tk wrote:
    With 10kWp modules, the peak sometimes reaches 12kW DC, mainly when it's cold and the sun comes out from behind the clouds. But the factory 10kW is often exceeded in March, April.
    I do not want to pick on, but writing "sometimes it reaches 12kW DC" shows a lack of knowledge
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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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