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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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  • #841 19486061
    prose
    Level 36  
    1.00. Supports.

    Added after 49 [seconds]:

    Check SD for errors.
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  • #842 19486072
    stev-an
    Level 19  
    Could someone have taken over the sofara, in the descriptions Italian technology, you can't even see the word sofar on the dark covers. My G3 is already V3. Interesting.
    But the site is great, all data available including updates. It is a pity that I do not see older soft.
  • #843 19486245
    ja_pizgam
    Level 10  
    I checked the card and there are no errors. I uploaded these files from ARM again and I still get the message "ARM file error". The question is whether there were 3 such files in previous versions:
    4-12KW_GD_ARM.bin
    ARM.bin
    ARM.hex

    Because maybe one of these files is unnecessary?
  • #844 19486273
    3301
    Level 34  
    ja_pizgam wrote:
    I checked the card and there are no errors. I uploaded these files from ARM again and I still get the message "ARM file error". The question is whether there were 3 such files in previous versions:
    4-12KW_GD_ARM.bin
    ARM.bin
    ARM.hex

    Because maybe one of these files is unnecessary?
    Attachments:
    • SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters waga.png (22.35 KB) You must be logged in to download this attachment.
  • #845 19486338
    ja_pizgam
    Level 10  
    I checked 4-12KW_GD_ARM.bin without this file, even the DSP triggered an error and after restart the inverter lost all data and the message "communication error" is displayed. Would you be so kind as to drop this version 2.30 or 2.20 if no one has a newer one?
  • #846 19486363
    3301
    Level 34  
    I'm tossing it again.
    .
    Attachments:
    • ARM.hex (708.69 KB) You must be logged in to download this attachment.
    • 4-12KW_DSPS.hex (220.21 KB) You must be logged in to download this attachment.
    • 4-12KW_DSPM.hex (238.68 KB) You must be logged in to download this attachment.
  • #847 19486381
    ja_pizgam
    Level 10  
    Unfortunately the problem with the update is the same, DSP1 and 2 updated to 2.20 and ARM crashed the same bug and still shows as version 2.50 so the inverter still doesn't work, but thanks a lot for the files.
  • #848 19486400
    3301
    Level 34  
    What I threw up has already been used 3 times and without problems, so probably something more serious either with the card or in the inverter, or maybe when you updated earlier, there was no interruption with DC power?
    Use a different card.
    Obviously you are doing this update with the AC off.
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  • #849 19486405
    ja_pizgam
    Level 10  
    No, today it's clear from early morning until now, it's still over 31 ° C outside. Maybe I will try with another card because this one is the original one removed from the inverter.

    PS. Yes, I do everything according to the instructions, turn off the inverter, disconnect the AC, insert the card, after a few dozen seconds, turn on the inverter (by the way, errors from GRID appear (too low voltage and frequency if I recognized it correctly from the manual, which is the normal sequence of things when I disconnected all AC) , go to the update section, enter the password and the update starts, DSP1 and 2 go through and right after confirming the end of the latter ("DSP 2 OK" message) I immediately get an error message with the ARM file, it does not even start updating it.


    Edit: I tried with a different card and fm v2.20 and the same problem continues. "ARM File Error" message.
  • #850 19486704
    jarczydło
    Level 15  
    I do not know if Sofar has this, but some devices only accept the latest firmware on the device or newer, the downgrade may not go through.
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  • #851 19486710
    ja_pizgam
    Level 10  
    Well, but why DSPs change without a problem, even from 2.90 to 2.20, but all the time with this ARM file there is a problem, it would be best to have version 2.50 now to replace these DSPs with 2.50, but from what I have seen people update to 2.70 works without any problems, only most she had a max of 2.30
  • #853 19486922
    jarczydło
    Level 15  
    Firmware 2.20 from col. Krzychooo , it went without a problem for me.
    I was upgrading from 2.0, hardware revision 1.0.
    Unpack the 7zip program and put it in the created folder - firmware on the memory card.
    Attachments:
    • firmware 220.7z (262.94 KB) You must be logged in to download this attachment.
  • #854 19487013
    Grucha383
    Level 12  
    For me, it was not like I wanted to update to 2.80 but fortunately we managed to come back to 2.20 and I do not do anything anymore.
  • #855 19488291
    ja_pizgam
    Level 10  
    As it turned out the problem was the file name, I changed it like amigo71 wrote and the inverter updated without any problem.
  • #856 19497583
    marucha79
    Level 15  
    I am not sure about my battery settings in HYD 5000-ES inverter. The magazine is 4 gels SSB100-12i, so the battery type is Default and some parameters to set. If you know the subject, please take a look if I combine well, especially I'm not sure about these lower tensions.

    Max Charge (V) - 57.3V (lower voltage range for cyclic charging 14.4Vx4)
    Over (V) Protection - 58.8V (maximum voltage for cyclic charging 14.7Vx4)
    Full Charged (V) - 53.2V (I assumed the voltage of a charged battery13.3Vx4, the manufacturer is silent about this)
    Min Discharge (V) - 44V
    Low (V) Protection - 43.2V
    Empty Discharged - 42.5V (you can't go any lower).
  • #857 19520401
    slonina
    Level 11  
    Thanks to prose and amigo71 for the link and tips on updating the firmware. At first glance, there are no problems with 2.90.

    Edit: But I returned to firmware 2.20. Perhaps 2.90 brings some new functionalities or corrects bugs - I haven't fully checked. According to my subjective assessment, after a few days of testing, the drawback of 2.90 is that it somehow approaches MPPT scanning more carefully. The result is that, for example, after the sun comes out from behind a 2.90 cloud, it does not immediately provide the expected maximum power. As at 2.20 the bugs only appeared during the winter period, when the panels were under snow, I decided to revert to this version. I added this info to the forum post as a warning to others, or rather to cool down emotions related to the unnecessary firmware change.
  • #858 19521776
    simirecki
    Level 12  
    I have Sofar 8.8 KTX-L with firmware version 2.4. Worth updating to a newer one? Nowhere can I find information about the improvements brought by newer software.
  • #859 19523032
    marucha79
    Level 15  
    I am just surprised by Sofar's policy (probably not only his) regarding the update. They produce a countable number of types of inverters, so what prevents you from placing soft on the page with the description of the modifications made? I am looking for a newer firmware for my HYD and it seems that my e-mail request will be rejected by the service, because this is what they did with the question in another matter.
  • #860 19523841
    prose
    Level 36  
    marucha79 wrote:
    I am looking for a newer firmwares for my HYD
    And what do you want to find in the new software? Better it won't work anyway.
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  • #861 19523972
    marucha79
    Level 15  
    I hope that the new soft will solve the problem of incomplete reporting via the datalogger (e.g. it does not provide current power, which would be useful when automating load switching) and in the on-grid mode it does not charge the batteries (in the off-grid mode, yes). Both things don't look like hardware problems to me.
  • #862 19524027
    simirecki
    Level 12  
    prose wrote:
    marucha79 wrote:
    I am looking for a newer firmwares for my HYD
    And what do you want to find in the new software? Better it won't work anyway.


    How do you know? Are they writing software for new numbers?
  • #863 19524771
    prose
    Level 36  
    Necessary documents for sofara after August 1.
    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
  • #864 19528033
    m7m
    Level 12  
    Hello.
    Does it mean that there are any new certification requirements?
  • #866 19528466
    prose
    Level 36  
    grzes601 wrote:
    The whims of the rulers crumbled due to slowness and laziness.
    link;
    You wanted to say the whim of the EU, that's where all the crap comes from.
  • #867 19535832
    slonina
    Level 11  
    The puzzle of firmware 2.90 has been partially solved by me today. It turns out that MPPT is not necessarily a priority in this version of the software. The inverter reduces power gradually when the AC voltage reaches the safety limit to prevent the inverter from shutting down completely. Perhaps earlier versions of the software, such as 2.80, also have this functionality. The firmware 2.20, praised by me above, certainly does not have this functionality.

    You can see the Sofara firmware is under development. It is indeed a pity that there is no publicly available list of bug fixes and improvements introduced by successive versions of it.
  • #868 19537210
    Kons18
    Level 12  
    In that case, we are waiting for the first volunteers who will decide to upload 2.90 and share their knowledge if something has changed for the better. By the way, is this soft available somewhere?
  • #870 19537614
    marucha79
    Level 15  
    Thanks a lot for this link, found and soft for my wonder on their site :)
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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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