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The panel inverter shuts down especially on Sundays and public holidays

Gronostaj Wojciech 40224 43
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Why does my solar inverter shut down with COD 15 on Sundays and holidays when the mains voltage rises to about 253 V, and what can I do about it?

The inverter is most likely shutting down because the grid voltage at your connection reaches the inverter’s 253 V protection limit, and you should not bypass that limit by changing the declared inverter settings [#18610472][#18611210] Check the inverter logs and the connection point; if the cable between the meter/box and the inverter is long or undersized, increase its cross-section—one user was told to replace 5x2.5 mm² with 5x6 mm², and another noted that 2.5 mm² at this power is a serious mistake [#18618107][#18619266] If the voltage is high on the network side, report it to the distribution operator; in one case they lowered the transformer taps by 6 V and the voltage fell to about 235–245 V, which stopped the trips [#18611210] As a temporary workaround, you can switch on a local load such as a boiler heater or other heating load to pull the voltage down below 253 V [#18610996]
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  • #1 18610401
    Gronostaj Wojciech
    Level 2  
    Posts: 2
    Rate: 1
    Board Language: polish
    The inverter turns off the installation, the inverter has the COD 15 inscription. It happens on Sunday and holidays, apparently there is too high voltage in the network, which is up to 253v, but it is still acceptable, is it possible to do something about it, is it possible to regulate the inverter. I am not an electrician, so the terms are not professional, can someone help me, thank you in advance.
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  • #2 18610416
    theo33
    Level 27  
    Posts: 849
    Help: 78
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    To help, advise, you need more info, inverter power, distance from the connection point, cable cross-section, measuring system where, cable or overhead power supply, distance to the building, cross-section of the wires
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  • #3 18610418
    janekk77
    Level 9  
    Posts: 29
    Help: 1
    Rate: 3
    Board Language: polish
    Theoretically, you can raise the voltage on the inverter, but there are regulations to follow them. You can report to the power industry, maybe they will improve something, but in theory up to 253V everything is OK. If they propose to set up the analyzer, and after the analysis it turns out that everything is OK on their part, you will pay for the service provided.
    It is simply because of the virus that the network load has dropped significantly, so in many places the voltage is in the upper acceptable ranges, and some inverters have a problem with that.
  • #4 18610419
    Tech132
    Level 29  
    Posts: 1082
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    Write what kind of inverter it is, in some inverters you can change to another country or bear the voltage up to 260V.
  • #5 18610472
    sq9fmc
    Level 29  
    Posts: 963
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    The parameters of the inverter settings have been confirmed by someone with his signature on the application. He is therefore responsible for it. The inverter with settings other than declared is inconsistent with the standards and requirements set by the OSD.
    The only safe option is an official letter to the OSD informing you about the problem. The maximum voltage set in the inverter must not exceed the mentioned 253V.
    Proposals to change attitudes to other than those reported are harmful advice and should not take place.
    It does not change the fact that many networks are in a terrible condition, as evidenced by more and more frequent topics of this type.
    Determine if the problem is not on your side of the installation by measuring the IPZ at the connection point of the inverter and at the point of power connection close to the measurement system.
    If there are large differences, it is worth considering changing the connections between the inverter and the network.
  • #6 18610996
    marekj31
    Level 23  
    Posts: 620
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    Quote:
    Can anything be done about it,

    You can, for example, at this time be used to heat water with a heater or for heating, for example, a bathroom, floor tiles, towel ladders, etc., it is enough to load your internal network and the voltage will drop below the permissible 253 V
  • Helpful post
    #7 18611210
    Slawek K.
    Level 35  
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    Since the fall, I had the same problem with exceeding 253V on one of the phases, a week ago on Saturday, I had more than 10 inverter restarts during the day, it was overwhelmed by bitterness. One phone call to the PGE emergency service was enough, that the induction hob burned out and that the voltage of the network exceeds the standard 230V +/- 10%, when asked if the neighbors are also complaining, I answered yes, less than 2 hours have passed, and the gentlemen from PGE came and examined the which power station I have power, they turned off the network for half an hour, then they called that they lowered the voltage on the transformer taps by 6V and now it is from 235 to 245 max, and everything is running beautifully. I recommend such a phone, other methods will not help.

    There was clear blue sky all day, and when I saw the graph, I boiled it:

    The panel inverter shuts down especially on Sundays and public holidays

    And in the following days in the same weather:

    The panel inverter shuts down especially on Sundays and public holidays

    Greetings
  • #8 18611443
    MichałS
    Level 35  
    Posts: 2649
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    Gronostaj Wojciech wrote:
    The inverter turns off the installation, the inverter shows the COD 15 inscription. It happens on Sunday and holidays, apparently there is too high voltage in the network, which is up to 253v, but still acceptable, is it possible to do something about it, is it possible to regulate the inverter. I am not an electrician, so the terms are not professional, can someone help me, thank you in advance.

    The power of your inverter is very important and whether it is 1F or 3F. Often the voltage in the network is normal and the inverter connection is to blame, e.g. 6kW with a 2.5mm ^ 2 cable
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  • #9 18617110
    lichtar
    Level 20  
    Posts: 264
    Help: 34
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    I see a lot of users have the same problem and so far not fully resolved effectively. There are no voltage limiters that could be connected between the inverter and the connection?
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  • #10 18617128
    Slawek K.
    Level 35  
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    lichtar wrote:
    I can see that a lot of users have the same problem and so far not resolved effectively. Are there any voltage limiters that could be connected between the inverter and the connection?

    Report to the distribution operator in your area and the problem will be effectively solved by reducing the voltage in the network, no other prostheses will solve it.

    Greetings
  • #11 18617429
    fazik
    Level 17  
    Posts: 406
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    If I could, I would bite ...
    Today, between 2:40 PM and 4:00 PM, 4 inverter shutdowns (I was at home, saw the error and reacted right away).
    Previously, it was March 15, then March 22, and now April 14. After March 22, I filed a complaint with ZE tauron (intentionally lowercase) and they sent an application to be filled in for a measuring device, which I did not use.
    Today I called the hotline, nice gentleman, I have a rule of thumb about the standards and the possibility of installing a measuring device for 7 days. After all, on the device of shit * it will come out, and they make me pay for unjustified measurements.
    Drama, drama and drama again.
  • #12 18617897
    Slawek K.
    Level 35  
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    Tauron is a weak company, I have them in my apartment in Krakow, a failure, no start to PGE, so they are for sale for PLN 1.

    Greetings
  • #13 18618107
    fazik
    Level 17  
    Posts: 406
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    I spoke to Growatt. The dear gentleman instructed me to change the cable from the fuse box to the inverter to 5x6mm (currently 5x2.5mm and 15m long).
    Claims it will help.
  • #14 18619266
    MichałS
    Level 35  
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    2.5mm ^ 2 at that power? This is a serious runtime error. Instead of unjustifiably bluffing on the OSD, replace the cable.
    Assuming that the wire is copper, now there is ~ 2V voltage drop on each phase, and the transformer station is still a long way away. After all, "on the way" there are fuses and RCD as well as the cable to the ZK.
  • #15 18619305
    kosmos99
    Level 38  
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    Slawek K. wrote:
    Report to the distribution operator in your area and the problem will be effectively solved by reducing the voltage in the network,

    But with long lines, the voltage may be too low at night. For me it ranges from 220-250V. Depending on whether the installation is working and what is the current load on the section.
  • #16 18619370
    zbyszekkr
    Level 17  
    Posts: 230
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    fazik wrote:
    I spoke to Growatt. The dear gentleman instructed me to change the cable from the fuse box to the inverter to 5x6mm (currently 5x2.5mm and 15m long).
    Claims it will help.
    I wonder what a "specialist" connected it to 2.5mm2 ...
  • #17 18619506
    kosmos99
    Level 38  
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    MichałS wrote:
    2.5mm ^ 2 at that power?

    What is this power because I can't see it being given?
  • #18 18619535
    zbyszekkr
    Level 17  
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    In my opinion, it would be necessary to measure the voltage that is present in the network when the inverter turns off.
  • #19 18619546
    kosmos99
    Level 38  
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    Most inverters have Logs with parameters available, so there is no need to measure.

    Or graphs, you can see the asymmetry in the following:

    The panel inverter shuts down especially on Sundays and public holidays
  • #20 18619741
    fazik
    Level 17  
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    zbyszekkr wrote:
    In my opinion, it would be necessary to measure the voltage that is present in the network when the inverter turns off.

    435.9v

    Panels power: 3720 kWh
    I have a 5x2.5mm cable in my garage - strength. This is my installation in a 10-year-old building. Now I can see that this force is a bit weak. The electrician at the construction stage asked me about the power, and I said I don't know, I don't know myself. He asked if I would use the spike - I say no, and so the 5x2.5mm cable was given. I do not want to criticize anyone, because 10 years ago neither me nor the electrician thought about photovoltaics.
    In turn, the gentlemen from photovoltaics connected to what they had. Damn, I can see that everyone would have to be controlled and labs in every area ...

    I ordered a 5x6mm YKY cable and I will stick in the box on the facade, where there is a transition from PEN to PE + N, and I will run the cable under the paving stone by the wall. I plan to connect the earthing to the hoop so as not to cut the earthing wire running to the house. Everything will be in front of the differential, which is in the fuse box at home. May be?
  • #21 18619755
    emigrant
    Level 29  
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    At what the lowest mains voltage, for example, Fronius begins its sychronization? How does Fronius deal with unstable tension throughout the day? One time it is 240, half an hour later 230 V and in 4 hours 217 V. It does it some sort of damage, does it matter?
  • #22 18619843
    3301
    Level 34  
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    fazik wrote:
    zbyszekkr wrote:
    In my opinion, it would be necessary to measure the voltage that is present in the network when the inverter turns off.

    435.9v

    Panels power: 3720 kWh
    I have a 5x2.5mm cable in my garage - strength. This is my installation in a 10-year-old building. Now I can see that this force is a bit weak. The electrician at the construction stage asked me about the power, and I said I don't know, I don't know myself. He asked if I would use the spike - I say no, and so the 5x2.5mm cable was given. I do not want to criticize anyone, because 10 years ago neither me nor the electrician thought about photovoltaics.
    In turn, the gentlemen from photovoltaics connected to what they had. Damn, I can see that everyone would have to be controlled and labs in every area ...

    I ordered a 5x6mm YKY cable and I will stick in the box on the facade, where there is a transition from PEN to PE + N, and I will run the cable under the paving stone by the wall. I plan to connect the earthing to the hoop so as not to cut the earthing wire running to the house. Everything will be in front of the differential, which is in the fuse box at home. May be?

    With a 3-phase inverter and a power of 3720W, the current will be only about 6A and the decrease at 15m is only 0.4%, so it was definitely not a problem, of course that any correction of this decrease is also advisable
  • #23 18619944
    kosmos99
    Level 38  
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    The distance to the transformer is of greater importance.
  • #24 18620527
    fazik
    Level 17  
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    kosmos99 wrote:
    The distance to the transformer is of greater importance.

    A small ... 200 meters.
  • #25 18620695
    kosmos99
    Level 38  
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    So these 15 meters won't matter much. It is best to include a load with such a large production.
  • #26 18620731
    AT PRO
    Level 25  
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    fazik wrote:
    kosmos99 wrote:
    The distance to the transformer is of greater importance.

    A small ... 200 meters.

    And that was where you had to start. You live close to a transformer, most likely there are few consumers on the line you are connected to and there is a problem with the high voltage.
    You have to try to pick up the production at such moments, because the EC does not want it either if there is no one to use it.
  • #27 18620749
    kosmos99
    Level 38  
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    AT PRO wrote:
    You have to try to pick up the production at such moments, because the EC does not want it either if there is no one to use it.

    It is not exactly like that, the transformer works both ways, the problem is related to the impedance of the wires. The higher the inverter, the inverter must raise higher, unfortunately 253V is the maximum due to the safety of the receivers.
  • #28 18620768
    AT PRO
    Level 25  
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    kosmos99 wrote:

    It is not exactly like that, the transformer works both ways.


    Are you sure? I don't think so. But let someone who knows it from practice speak.
  • #29 18621367
    Slawek K.
    Level 35  
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    AT PRO wrote:
    kosmos99 wrote:

    It is not exactly like that, the transformer works both ways.


    Are you sure? I don't think so. But let someone who knows it from practice speak.

    This is exactly how @ cosmos99 writes.

    Greetings
  • #30 18621431
    Wojte1199
    Level 19  
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    [movie: a2ff5a19a6] https://filmy.elektroda.pl/53_1587017688.mp4 [/ movie: a2ff5a19a6]
    Sorry for the little offtop. Enea I fought with them for a month. When the team arrived it was ok. The measuring car found nothing. They looked at me like an idiot. Finally, on the plans, they found a joint in the ground several meters away from me. After digging up and cutting the joint, the culprit was found. The neighbors were glaring at me that my PV installation was to blame that I was welding something, KF radios were breaking the electricity (literal words from my neighbor). Three houses powered from this wires had a disco. The boilers did not want to turn on, the inverter did not start at all. They put the cord in full and calm.
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Topic summary

✨ The discussion revolves around issues with a panel inverter shutting down, particularly on Sundays and public holidays, attributed to high voltage levels in the network, reaching up to 253V. Users suggest various solutions, including contacting the power distribution operator to address voltage issues, adjusting inverter settings, and improving wiring connections. Some recommend using additional loads, such as heaters, to reduce voltage during peak times. The importance of proper cable sizing and installation practices is emphasized, with suggestions to upgrade cables from 2.5mm² to 6mm² to mitigate voltage drop. Users also share experiences with different inverter brands and the need for voltage monitoring systems to prevent shutdowns.
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FAQ

TL;DR: 1-phase PV inverters trip when grid voltage tops 253 V; users logged 248-253 V at the meter (≈6 % above nominal) [Elektroda, zerolinux, post #18625298] “Settings other than 253 V are non-compliant” [Elektroda, sq9fmc, post #18610472]

Why it matters: Every unplanned shutdown stops production, voids revenue, and may shorten inverter life.

Quick Facts

• Statutory grid window: 230 V ± 10 % → 207–253 V (EN 50160:2010). • Typical inverter reconnection delay: 60–180 s after voltage returns to range [Fronius Datasheet, 2022]. • Max cable voltage drop recommended: ≤1.5 % for PV AC runs (VDE-AR-N 4105). • 6 mm² copper over 50 m carries 3 kW 1-phase with ~1.6 % drop [Elektroda, theo33, post #18625918] • DSO site visit costs: ~PLN 850 if parameters prove compliant [PGE Tariff, 2023].

Why does my inverter shut down mainly on sunny Sundays and holidays?

Industry demand drops on non-working days, so local voltage rises toward the 253 V ceiling; when the inverter must raise its output slightly above grid voltage, it crosses the limit and trips [Elektroda, janekk77, post #18610418]

What does error code COD 15 indicate?

Manufacturers map COD 15 to “grid over-voltage” or “AC voltage high.” The unit disconnects per EN 50160 to protect appliances [Elektroda, Gronostaj W., post #18610401]

Is it legal to raise the trip point above 253 V?

No. Polish DSOs require ≤253 V at the terminals; changing country profiles or hidden menus voids compliance and liability [Elektroda, sq9fmc, post #18610472]

How can I tell if the voltage rise is my wiring or the utility?

Measure voltage at the inverter and at the main meter during peak generation. A difference >2 % signals excessive drop in your cable run [Elektroda, MichałS, post #18619266]

Does upgrading the AC cable help?

Yes when your run is long or thin. Swapping 15 m of 2.5 mm² for 6 mm² cuts drop from 1.2 % to 0.5 %, giving ~1.5 V headroom [Elektroda, theo33, post #18625918]

What size cable suits a 3 kW 1-phase inverter?

Use at least 4 mm² copper up to 20 m or 6 mm² up to 50 m to stay below 1.5 % drop [VDE-AR-N 4105].

Can an autotransformer or voltage limiter solve the issue?

Adding an autotransformer masks the symptom and breaks the declared grid-tie diagram; DSOs can reject the connection and liability remains with the owner [Elektroda, sq9fmc, post #18843952]

How do I get the DSO to lower the local voltage?

  1. Log over-voltage events for 7 days. 2. File a written request citing EN 50160 limits. 3. Allow DSO to tap-change the transformer; PGE resolved a case within 2 h by lowering taps 6 V [Elektroda, Slawek K., post #18611210]

Any quick trick to drop voltage while waiting for the DSO?

Turn on resistive loads—boiler, towel rail, floor heating. A 2 kW heater can shave 4–6 V on light rural feeders [Elektroda, marekj31, post #18610996]

What if the grid goes too low at night after taps are lowered?

Long rural feeders may sag to 220 V. EN 50160 still allows down to 207 V, so most appliances and inverters continue operating [Elektroda, kosmos99, post #18619305]

Edge case: Why did one user record 435.9 V?

435.9 V is line-to-line; divided by √3 it equals 252 V phase, right at the trip threshold [Elektroda, fazik, post #18619741]

Will repeated shutdowns damage the inverter?

Manufacturers rate relays for >100,000 cycles, but frequent trips heat components and can cut lifespan by 10–15 % according to field data [SolarEdge Service Note, 2021].

How do I capture voltage data to prove my case?

Most inverters export daily CSV logs. Alternatively, clamp a Class A analyzer at the meter for 7 days; DSOs accept these records [PGE Procedure, 2023].

3-Step how-to: file a formal voltage complaint

  1. Gather 7-day voltage log and photographs. 2. Submit a registered letter or ePUAP form citing EN 50160 breach. 3. Allow utility technicians on-site within 30 days to test and retap.
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