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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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  • #511 19365029
    toolpusher
    Level 23  
    From what I found out in Sofar Polska, anything above 2.20 or 2.30 adds nothing to the inverter's operation. Cosmetics in the positive form of other languages, etc. etc. Then the most recent was 2.70.
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  • #512 19365037
    bioly
    Level 12  
    I updated via SD card, the previous firmware I had was 2.30.
    I don't know about the changes yet. I was doing some updates this morning.
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  • #513 19365087
    3301
    Level 34  
    I meant what inverter did you update? what model do you have and what was the earlier soft? V ???
  • #514 19365834
    bioly
    Level 12  
    The inverter is 8.8 KTL-X
    Transverse soft is 2.30
  • #515 19365880
    Grucha383
    Level 12  
    bioly wrote:
    The inverter is 8.8 KTL-X
    Transverse soft is 2.30


    Thanks, mate. I wonder if it can be updated via datalogger because it has upgrade inverter options. And if not, I will do it by sd card.
  • #516 19366086
    bioly
    Level 12  
    I was just wondering if it would go through Datalogger, but I stopped production for 8 minutes.
  • #517 19366853
    Cytro12
    Level 26  
    Sofar has no remote upgrade or management?
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  • #518 19367003
    3301
    Level 34  
    Cytro12 wrote:
    Sofar has no remote upgrade or management?


    Are you sure there isn't?
    I am using the website: //pro.solarmanpv.com/business and there is such an option, but in my case it did not work, I think that I am doing something wrong and I did a trip and already on, from the sd card
    Attachments:
    • SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters zdalna.tom.pr.jpg (137.6 KB) You must be logged in to download this attachment.
  • #519 19367008
    Cytro12
    Level 26  
    I am asking because it looks like Sofar has been lagging behind today. Where are the rest of the settings?
  • #520 19367153
    toolpusher
    Level 23  
    Apparently, there is such a possibility in these new firmware, but I have not yet found anyone who would use it. In the new series of inverters marked as Generation 3, which will be launched at any moment, it will already be standard.
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  • #521 19370635
    Grucha383
    Level 12  
    For me, this soft 2.80 does not come in, it crashes into DSP2.
  • #522 19370683
    marwi123
    Level 13  
    Hello.
    What is the maximum AC operating voltage of the inverter under code 22 Europe General?

    best regards
  • #524 19371286
    prose
    Level 36  
    toolpusher wrote:
    prose wrote:
    Going back to the SW jumpers it works.
    https://www.facebook.com/groups/2345153242455337/permalink/2421862181451109/


    the topic has already disappeared from the group. The question of correctness is what my colleague Prose gave for the 5.5KTL-X version, we have 1110.

    I have already corrected. In fact, the link does not work has been removed from the Facebook page. Interesting what?
  • #525 19371299
    Cytro12
    Level 26  
    For the cash register? Now everyone will buy the basic version and move the jumpers until they block this possibility :)
  • #526 19371327
    toolpusher
    Level 23  
    We can only guess. The author wrote the thread out of date but probably FB ordered him to remove it at someone's request. In any case, it works and people have confirmed it with charts. I myself would replace the inverter with a larger one, but I can't because "My electricity" does not allow me and after 5 months I do not even have money (and the 3-year grace period begins only after receiving the cash) and probably people are also in this situation and benefit from counting with the consequences or not.
  • #527 19371586
    Cytro12
    Level 26  
    If it spreads out, they will be blocked and the prosumer day will end :)
  • #528 19372080
    prose
    Level 36  
    toolpusher wrote:
    We can only guess. The author wrote the thread out of date but probably FB ordered him to remove it at someone's request.

    The author himself removed.
  • #529 19372113
    toolpusher
    Level 23  
    My question on the group about his motives went unanswered. I can't believe he removed it himself. The claim that the topic is out of date is bizarre. People opened inverters, took pictures and the guy arbitrarily one-man removed the topic for no reason?
  • #530 19379290
    adamvfr
    Level 11  
    prose wrote:
    th33nd wrote:
    prose wrote:
    Just switch to SW for more power ....
    how to set up a txt file



    Where's that file?
    Will it change from 8.8kW 1100 to 11kW 1011?

    Someone checked if the hardware is identical?


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


    Is it similar in single-phase KTLM inverters?
  • #531 19380412
    prose
    Level 36  
    adamvfr wrote:
    Is it similar in single-phase KTLM inverters?

    I don't know, I didn't get it started.
  • #532 19380467
    toolpusher
    Level 23  
    adamvfr wrote:

    Is it similar in single-phase KTLM inverters?


    Open the photo and see if there is a similar jumper.
  • #533 19380819
    adamvfr
    Level 11  
    I will ask my neighbor because I have edited him, but he will definitely not agree.
    I don't remember, there's some gn-seal there. ?
    Added after 6 [minutes]:

    A riddle question.
    Recently, I installed two inverters, one 3.6KTLM and 3300TL, both single-phase, both from the EU market.
    Going into the settings, "mptt scanner" and below - turned on, I do turn off and it writes "success".
    I go back in and write that the scanner is on.
    Are you sure it is turned on? Because when I really want to turn it on, I have to provide a time frame.
    Someone once wrote that the scanner is off by default. but when i check it in the morning it is on even right after the alleged shutdown.
  • #534 19381067
    prose
    Level 36  
    adamvfr wrote:
    I don't remember, there's some gn-seal there. ?

    There are no seals.
  • #535 19386156
    Janusz_kk
    Level 39  
    Hello
    I also plan to buy this 8.8kw sofar because now there is a good price and panels for it, I have 28 320W panels in the plan,
    allegro.pl/oferta/panele-sloneczne-320w-fotowoltaika-pv-mono-9838565937

    I counted the voltages, everything is ok, but I'm afraid that I will cut the power because the nominal power is 8,960W and I have a roof 40 degrees perfectly south, quite high because almost 400m above sea level and I'm just wondering how much the power of the panels will exceed me.
  • #536 19386216
    3301
    Level 34  
    The inverter 8.8 is 8800 W and you have 8960 in modules.It may of course happen that it will be 100 or 105% and unfortunately the inverter will limit to 8800 but it may never happen and this is more likely
  • #537 19386235
    Janusz_kk
    Level 39  
    So what to buy 10kW or let go, the prices are good and 8.8 or 10 is almost the same.
  • #538 19386253
    3301
    Level 34  
    If you have 8960 in modules and you do not intend to add 2 modules, then 8.8
  • #539 19386255
    Krzychooo
    Level 16  
    Janusz_kk wrote:
    Hello
    I also plan to buy this 8.8kw sofar because now there is a good price and panels for it, I have 28 320W panels in the plan, ...


    I have a SOFAR 8.8 KTL-X and 26 310Wp panels, which is 900 Wp less.


    Janusz_kk wrote:
    ... I counted the voltages, everything is ok, but I'm afraid that it will cut my power because the nominal power is 8 960W
    and I have a roof at 40 degrees south, quite high, because almost 400m above sea level, and I'm just wondering
    as long as I exceed the power of the panels.


    Height 80 m above sea level, roof 30 °, elevation 200 ° (almost noon, peak power around 1:15 pm), and for example on Wednesday it was 9000 W for a while!
    then it cut to 8,800.

    I'm afraid you'll over-invest in those 2-4 panels.
  • #540 19386314
    Janusz_kk
    Level 39  
    3301 wrote:
    if you have 8960 in modules and you do not intend to add 2 modules, then 8.8

    I don't have room anymore, so it's full. I make two asymmetrical thongs because I have a 'swallow' which shades my sides a little SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
    this photo from August 21 at 9.05,
    therefore I give one g string on top which will cover the top row and 3 on the second left and 2 on the right for a total of 15 giving Voc max = 840V, Vm = 598V and a power of 5,760W. The second string is the rest, 13 panels, Vm = 395V, just enough for the inverter to enter the optimal range. power 4 160W.
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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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