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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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  • #91 18435513
    1969pawel
    Level 12  
    Mirek_Gab wrote:
    ..from two weeks. Unfortunately, without PL. But I'm looking for a software :)

    If you find soft and want to share, I am willing to try to change the software. Only I have a Sofara 11kW.
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  • #92 18435565
    Mirek_Gab
    Level 13  
    Give me the model because today my ping-pong friend sent me something :) What's your soft?
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  • #94 18435714
    Mirek_Gab
    Level 13  
    And what soft do you have?
  • #95 18435764
    1969pawel
    Level 12  
    I'll check tomorrow because it's already turned off.
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  • #96 18435824
    Mirek_Gab
    Level 13  
    You have a sticker on the side. Write on Priv
  • #98 18435863
    Mirek_Gab
    Level 13  
    He sent me a soft but for Sofar with firmware version 1.90 and ulgrade to 3.40 and I'm afraid to change it.
  • #99 18435997
    1969pawel
    Level 12  
    Are you afraid that it is not up to your model? Are you blasting the inverter? Maybe someone who changed the soft and will tell you this post is reading this post?
  • #100 18436270
    Mirek_Gab
    Level 13  
    As I wrote above, this upgrade is to Sofar with software v.190 and I have v.180. Therefore, I am waiting for a suitable one for mine.
  • #101 18448660
    Shot
    Level 13  
    Hey today my Sofar 5.5ktl-x is not producing, it shows Grid OFP network error. From 9 am, it shows the network frequency at 50.8 Hz. Has anyone encountered such a problem?
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  • #102 18448760
    3301
    Level 34  
    Network frequency too high is an ID03 error, measure how you have what or it is actually higher, otherwise restart and delete and observe
    Some time ago, right after the first start, ID04 GridUFP appeared, i.e. the frequency too low, but after deleting it, I did not see it anymore
  • #103 18448771
    Shot
    Level 13  
    I have GridOFP Bit2 and the frequency is still too high on the chart. 0W production. I wonder if my Sofar is crazy and the restart will help him, if someone in the area started the installation with a wrongly configured inverter and "turned off the light for everyone"
  • #104 18448815
    3301
    Level 34  
    What graph do you see the frequency on? do you use the solarman during the preview?
    The fact that someone would have bad network settings is rather not possible with micro-installation, unless you use a small transform with a power lower than this incorrectly set micro-installation
  • #106 18449348
    3301
    Level 34  
    In fact, it is a professional website, I practically do not use it anymore
  • #107 18494647
    iwostar
    Level 10  
    I promised to let you know about a solution to my problem.
    The panels have been divided into two circuits and so far everything works :)

    However, I still have a question for experts :)
    How many PV modules Q.CELLS Q.PEAK G4.1 305 MONO BLACK can be connected to the inverter - SOFAR 4KTLM-G2?
    Regards and thank you!
  • #109 18531963
    iwostar
    Level 10  
    kosmos99 wrote:
    14 pieces. After 7 on MPPT.


    I have 15 pieces and now it works ok.
  • #110 18531974
    kosmos99
    Level 38  
    But you have exceeded the permissible power (4400W).
  • #111 18532029
    3301
    Level 34  
    The power is a bit higher, but it will cut the most and I wonder if it cuts something, you can put a graph of DC power and currents
  • #114 18532160
    iwostar
    Level 10  
    this is how it looks today
    Attachments:
    • SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters Zrzut ekranu 2020-03-15 o 11.46.54.png (74.53 KB) You must be logged in to download this attachment.
  • #115 18532172
    3301
    Level 34  
    OKAY. after all, you have the east-west and it will never be cut and here on one entrance it is easy to install 3

    Added after 23 [minutes]:

    however, it is not the east-west, it looked like this from a piece of the chart, but here it probably cuts a little, which will be more visible at the end of production, the limit will be 4 kW with some catch
  • #116 18535016
    rakmo
    Level 13  
    Hello, I have a sofarsolar3.6 ktml g2 inverter with two strings attached
    East-West 2x6. There was a strange problem on one string I have a cutting voltage of 205v, on the other it is around 230v. On the graph it looks like someone drew a straight line from the ruler, what could be the reason, is it supposed to be, but in this case I'm losing power. Maybe some settings in the inverter. Someone has instructions for this model in Polish.
    Attachments:
    • SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters jjjj.jpg (100.59 KB) You must be logged in to download this attachment.
  • #118 18535571
    rakmo
    Level 13  
    The installation has been operating since March 12. Yesterday's graph is very similar,
    Attachments:
    • SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SmartSelect_20200316-182629_Chrome.jpg (355.12 KB) You must be logged in to download this attachment.
    • SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters Screenshot_20200316-182804_Chrome.jpg (211.47 KB) You must be logged in to download this attachment.
  • #119 18535631
    theo33
    Level 27  
    little is four = legible
    upload graphs of DC voltages, DC currents and power from one day but separately
    I see that solarman, you do not have this install available to the public?
  • #120 18535657
    noja102
    Level 24  
    The manual in Polish for the older model, but little has changed
    Attachments:
    • instrukcja_sofarsolar.pdf (11.52 MB) You must be logged in to download this attachment.
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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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