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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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  • #271 19035241
    rydzyk673
    Level 11  
    I am approaching the inverter early this morning to see what and how and the inverter is trying to start but it goes out soon (the screen lights up for 1s + the word initialization and then goes out), I guess it's because the current from the PV panels is too weak.
    Is this normal and is it meant to be? If so, then this situation will not have a positive effect on the inverter, capacitors inside, etc.
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  • #273 19035401
    pief
    Level 17  
    I was playing this soft from col.grout383 - I do not know what soft it is, for sure higher than my 2.01, tomorrow I will check
    key combination, I hope it works, but not Chinese.

    And how do colleagues know about these keys?
    I will ask for the codes again, there are other "secret" ones.
  • #274 19035599
    prose
    Level 36  
    There are service codes, but it's hard to ask someone to provide it. I found out about the keys from fejsbuka from the sofara forum.
  • #275 19035665
    pief
    Level 17  
    Tomorrow I will try the update from scratch, we'll see what comes out of it.
    Thank you greetings
  • #276 19036225
    pief
    Level 17  
    Welcome back.

    I tried to update the inverter, uploading the software went smoothly.

    The key combination (I tried differently) does not work, when changing the language p.10 settings you have to enter the code.
    Codes 0001 and 0715 do not work.
    There was nothing else to be done. I will keep trying as soon as the codes appear, without it it will not be possible.

    I have read that if the serial number contains the letter C, the inverter is intended for the Chinese market, and
    maybe there is a problem here, because I have one.

    Authorized Corab points etc work poorly with support, update, in general it's some kind of secret.
    There are new updates visible but not available to us. Pity.
    best regards
  • #277 19036344
    Grucha383
    Level 12  
    Soft 2.20 is in Polish. For me, after uploading, the default was English.

    And on a different barrel, the wifi module stopped working today, resetting does not help. Has it fallen? Yesterday it was working normally.
  • #278 19036361
    pief
    Level 17  
    When uploading, the default was Chinese, you need a code to change the language.

    See the LEDs on the module to see what is lit.
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  • #279 19036387
    Grucha383
    Level 12  
    Nothing shines unless it fell :)
  • #280 19037010
    prose
    Level 36  
    pief wrote:
    When uploading, the default was Chinese, you need a code to change the language.
    Enter the code in position 6, code 0001 and it will unlock for 24 hours Left button 1 time right 1 time arrow down 5 times and right button 2 times and enter code 0001.

    Added after 6 [minutes]:

    To change the language, left 1 time right 1 time and the down arrow 9 and right 1 time with the arrow you select the language.

    Added after 1 [minutes]:

    I also have the first Chinese, the second English.
  • #281 19038447
    wilk125
    Level 23  
    Grucha383 wrote:
    Soft 2.20 is in Polish. For me, after uploading, the default was English.

    And on a different barrel, the wifi module stopped working today, resetting does not help. Has it fallen? Yesterday it was working normally.


    You have not changed the address (modbus), which if you set it to other than 01, wifi does not work, such a bug in the software.

    Added after 49 [seconds]:

    pief wrote:
    Authorized Corab points etc work poorly with support, update, in general it's some kind of secret.
    There are new updates visible but not available to us. Pity.

    Where do you see these updates?
  • #282 19038516
    toolpusher
    Level 23  
    As far as I know, Corab has a database of the serial numbers of the inverters it has sold. If you are not in their database, they will not help you.
  • #283 19038560
    pief
    Level 17  
    pief wrote:
    Authorized Corab points etc work poorly with support, update, in general it's some kind of secret.
    There are new updates visible but not available to us. Pity.

    Where do you see these updates? [/ Quote]

    My friends have softs v2.20, v2.30 in inverters, I have v2.01 and I would like to
    upload a newer soft.
    Where I see the update, since there are newer software, it's logical
    is that they should be made available, it would mean that the company is developing the product and improving
    eliminates errors, unless the company's policy is to send
    inverter, and finally pay.

    Unfortunately Col. Prose failed, as long as the unlock code in pos. 6 - 0001 is
    good in pos. 10 codes (0715, 0001) are not accepted.
    Thanks for your help. Maybe someone will post the codes. best regards
  • #284 19038582
    prose
    Level 36  
    pief wrote:
    10 codes (0715, 0001) are not accepted.

    In position 10, you do not enter the code, but select the language with the arrow and enter, right.
  • #285 19038609
    pief
    Level 17  
    In the old version I have, as you say, item 10 and the arrows I choose the language, in the new one I enter item 10 and pops up to enter the code, I will try again (I will take photos) on Monday.
    Thanks.
  • #286 19038639
    3301
    Level 34  
    Change the date to any earlier, restart, attempt and how impossible is the date to the current one and try, restart, try
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  • #287 19038705
    Grucha383
    Level 12  
    I got a new datalogger and it works. Interestingly, I can see in its menu the possibility of updating the inverter firmware. Before that, it probably wasn't.
  • #288 19038724
    wilk125
    Level 23  
    pief wrote:
    Where I see the update, since there are newer software, it's logical
    is that they should be made available, it would mean that the company is developing the product and improving
    eliminates errors, unless the company's policy is to send
    inverter, and finally pay.


    But where are these updates, where can I download them (link) or at least see if something new is released?
  • #289 19039021
    pief
    Level 17  
    Approx. I will try, but only on Monday.

    Added after 4 [minutes]:

    wilk125 wrote:
    pief wrote:
    Where I see the update, since there are newer software, it's logical
    is that they should be made available, it would mean that the company is developing the product and improving
    eliminates errors, unless the company's policy is to send
    inverter, and finally pay.


    But where are these updates, where can I download them (link) or at least see if something new is released?


    Well, it is nowhere.
    My colleagues above gave soft, probably v2.20, thank them that they want to share.
    Distributors attacked us.
    best regards
  • #290 19039049
    wilk125
    Level 23  
    pief wrote:
    Well, it is nowhere.
    My colleagues above gave soft, probably v2.20, thank them that they want to share.
    Distributors attacked us.

    So the fact that there are newer sofas are determined by the fact that some people have newer soft in the inverter.
    I have v230 myself
  • #291 19039065
    pief
    Level 17  
    It's great to enjoy it.

    If a colleague wants to, have him copy the memory card and insert v.230.

    Maybe it will suit me and others. best regards
  • #292 19039147
    wilk125
    Level 23  
    pief wrote:
    It's great to enjoy it.

    If a colleague wants to, have him copy the memory card and insert v.230.

    Maybe it will suit me and others. best regards


    I'll post tomorrow

    Added after 5 [hours] 12 [minutes]:

    there is no software on the card, only cvs files
  • #293 19042042
    pief
    Level 17  
    Water hen, too bad.

    And this is what I wrote about earlier.

    Let my colleague "crash" soft and you need to update again (I do not wish), and you need to send the entire inverter to the site.
    Lime Tree.
    best regards
  • #294 19042171
    toolpusher
    Level 23  
    Kolego Pief, and did you write to Sofara in Poland?
  • #295 19042677
    Emi_B
    Level 9  
    wilk125 wrote:

    In addition, I measured the current on each phase, at rest (as there is no PV power supply), on each phase it is about 0.2A, active power 0W (from the sub-meter), immediately after starting this current slightly increases because it gives active power, but the solarman and the data after modbus show about 0.9A on each phase, is this an error in measuring this current by the inverter? How does it look like with you? Earlier, there were probably no such indications of currents, or I did not pay attention.


    Similarly for me:

    SOFAR 8kW PV Installation: Opinions, Durability, Failures & Experiences with Inverters
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  • #296 19049031
    prose
    Level 36  
    The following languages are available in the current firmware version (V1.70): Chinese, English,
    Italian, German, French, Portuguese, Slovak, Ukrainian and Finnish; newer software updates
    may contain additional languages.
  • #297 19050452
    rydzyk673
    Level 11  
    From the observation of the inverter's operation, I notice that when the sun suddenly comes out from behind the clouds, until it reaches its full output power, "moments gather". The output power grows rather slowly. Perhaps the MPPT is calculating and it takes him so long ...

    For example: sun obscured cloud> power on 1KW inverter. Suddenly the sun will come out and the power from 1KW grows about 1 minute until it reaches 3KW

    This creates some energy loss on the days when the sun shifts and hides behind the cloud.
    Do other inverters also behave like this?
  • #298 19050753
    prose
    Level 36  
    rydzyk673 wrote:
    From the observation of the inverter's operation, I notice that when the sun suddenly comes out from behind the clouds, until it reaches its full output power, "moments gather". The output power grows rather slowly. Perhaps the MPPT is calculating and it takes him so long ...

    For me today I watched and the power grew quickly as the sun came out of the cloud, check if you have MPPT scanning enabled.
  • #299 19053008
    rydzyk673
    Level 11  
    MPPT scanning is always off by default and so I have. has anyone tried to turn it on? What were the effects?

    Yet such a thing; I have a 1.5KW heater in the boiler and I would like the heater to start automatically on sunny days when the production is about 4.5 KW (1.5KW per phase). And when the Z PV production decreases, the heater would disconnect.
  • #300 19053070
    3301
    Level 34  
    If you don't have any module shading, leave mppt turned off

    PR priority relay - with a through channel for the current cable from the inverter
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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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