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

---Ryba--- 489681 1705
Best answers

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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  • #1 18111924
    ---Ryba---
    Level 13  
    I configure a PV installation around 8kW. What are your experiences with Sofar inverters. Any problems, failures. The price is right.
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  • #2 18112697
    iborkim
    Level 13  
    For over a year, I have had no problems with Sofar 6.6KTL-X.
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  • #3 18306997
    grzeziu
    Level 12  
    I have a problem with connecting to wifi.
    No service, I do not recommend the company where I bought Green Buton for help as a service technician asks for money PLN 1200, they say that they must earn. \ I do not recommend calling me 793 766 295
  • #4 18307191
    iborkim
    Level 13  
    Pol-Solar sp. Z oo is not a warranty service?
  • #5 18322870
    iwostar
    Level 10  
    For me, in the documents received at the purchase, he is a guarantor, but he sends me back to Corab and they to the seller ... :(
    I have errors: BusOPV and PVOVP
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  • #6 18322947
    grzeziu
    Level 12  
    What Corab RIP?
    The Sofar Solar service is just under construction
    in Poland.
    Write service.pl(_at_)sofarsolar.com
  • #7 18323064
    iwostar
    Level 10  
    He hasn't responded to an e-mail since yesterday. The representative in the telephone conversation sends you back to the company that installed the set.
  • #8 18323085
    grzeziu
    Level 12  
    flies in a balloon
    who was assembling
  • #9 18323090
    iwostar
    Level 10  
    GlobalSun. Dad with son. It turned out that they have poor knowledge and experience. But the company's name is strong ;)
  • #10 18323093
    grzeziu
    Level 12  
    it's up to them

    maybe they connected something wrong

    Added after 1 [minutes]:

    you want to call me
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  • #11 18323098
    3301
    Level 34  
    Start with the installer, according to the errors it turns out that the input voltage is too high, maybe the wrong number of panels
  • #12 18323102
    grzeziu
    Level 12  
    write how many strings for how many panels and what panels
  • #13 18323108
    slaslo
    Level 18  
    Quote from the SOFAR KTL manual:
    PvOVP

    The input voltage is too high

    Check if too many PV panels are not
    connected to one string so that
    the voltage (Voc) was not greater than the maximum
    input voltage of the SOFAR inverter. If so
    situation arises, connect the appropriate number
    PV panels in a string to reduce the voltage in
    chain, so as to fit them to the max. voltage
    inverter inputs. The inverter will automatically return
    to normal state after correcting the number of panels w
    chain.
  • #14 18323117
    iwostar
    Level 10  
    The case with the seller has one more thread, apart from the technical one. I will wait for a response from Corab.
    Generally the inverter works. From time to time, errors pop up and it turns off for several or several hours. Then, it activates itself again, e.g. after a night or an hour (I don't know exactly).
    It does not look like there are too many panels, because in summer itself it worked normally on sunny days, and it can turn off on a cloudy day, although I think it may be affected by the sudden departure of strong sun from outside the clouds.
  • #15 18323123
    grzeziu
    Level 12  
    write how much do you have on 1 page

    Added after 42 [seconds]:

    write how much do you have on 1 page

    Added after 1 [minutes]:

    as the sun gets stronger the power increases and the inverter will turn off so as not to break down
  • #16 18323129
    iwostar
    Level 10  
    but even when it is cloudy, despite disconnecting from the network for 5 minutes. and reconnection, errors pop up again.
  • #17 18323132
    grzeziu
    Level 12  
    why don't you write how many panels you have
  • #18 18323136
    iwostar
    Level 10  
    15 Q.CELLS Q.PEAK G4.1 305 MONO BLACK PV modules work with the SOFAR 4KTLM-G2 inverter
  • #19 18323144
    grzeziu
    Level 12  
    you have 2 strings separated because for 1 string 2600 in
    czylimax 8 panels
  • #20 18323150
    3301
    Level 34  
    It's not about power, but the voltage of this 1-phase sofar has a maximum of 600V and if these 15 are connected in series in 1 string, it is probably a nap. max is exceeded
  • #21 18323151
    iwostar
    Level 10  
    Do you think my specs got 7 panels wrong? So I understand that the inverter is too weak and what should be the right one?
  • #22 18323157
    grzeziu
    Level 12  
    I just look at the dtr and I also splashed phase 1 strange but in houses usually 3 phases should be

    Added after 1 [minutes]:

    from the calculations comes out 600 v
  • #23 18323222
    kosmos99
    Level 38  
    iwostar wrote:
    15 pcs of PV modules cooperate with the SOFAR 4KTLM-G2 inverter

    Are they connected to one or two MPPTs? (Are there 2 or 4 wires from the panels to the inverter?)
  • #24 18323250
    Leon444
    Level 26  
    grzeziu wrote:
    I just look at the dtr and I also splashed phase 1 strange but in houses usually 3 phases should be

    Added after 1 [minutes]:

    from the calculations comes out 600 v


    Expand your speech because it intrigued me ?
  • #25 18323265
    grzeziu
    Level 12  
    don't I have the strength there?
  • #27 18323385
    grzeziu
    Level 12  
    possibly you need to bridge 2 mpp outputs of the tracker so that he reads as one and sums up because for 1 tracker 2600 in the podlancza network, that is, plus and minus need to be divided into 2 slots and in the reading 1 mmp tracer
  • #28 18323399
    iwostar
    Level 10  
    Thanks for the advice, maybe this is actually the solution.
  • #29 18323425
    grzeziu
    Level 12  
    try on 8-9 panels, disconnect the rest and also try then there in the mouth is each tracker independently or 2 together, i.e. as I wrote above, please let me know if it helped
  • #30 18323542
    iwostar
    Level 10  
    I do not undertake these works myself, but I will let you know about a possible solution. Thanks!
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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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