Hello Such errors have been popping up for some time regardless of the time of day. When such an error occurs, the main differential at home goes out. I understand the errors, but why is the differential blowing out, the installation is connected right after the differential in the switchboard.

There is some current leakage somewhere. For inverters, a differential with a leakage current of 100mA is recommended. The one you have should have a value of 30mA, which is three times more sensitive.

That's right, mine is 30 mA and there is no other one in the installation.

An extra one should only be added to the inverter circuit. Of course, it's best to check if everything is fine with the installation and the inverter.

I also have 30mA and there is nothing wrong, I need to check the installation and grounding.

@bobo 44, post photos of the boxes next to the inverter.

Grid OVP, UVP, OFP, UFP means too high and too low AC voltage and too high and too low frequency, perhaps there are some anomalies in the grid. The inverter power supply should be connected before the residual current circuit breaker, of course through overcurrent protection. Download the AC voltage and current parameters from the inverter and check whether these parameters differed from the time when the inverter was working correctly before the error occurred.

In Sofar, such errors appear when the AC is disconnected. I checked it on my own.

There were machers from the company and they said that they would connect a 100mA differential on the set, I'll see what it will do. When this error appears, the differential goes out, but after turning off the inverter, everything works fine.

If the RCD trips, something is wrong, maybe the insulation is damaged somewhere and there is a short between N and PE, or a bad connection of the differential switch and/or inverter. Have them check the type of network you have with the instructions for connecting the inverter. Increasing the sensitivity may mask the problem, but it will not solve it.

But I understand that this will be an additional differential, not the existing one?

Sofar 5.5K Grid Errors OVP, UVP, OFP, UFP: Troubleshooting Differential Tripping Issues

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#1 19115309 15 Dec 2020 09:40

bobo 44 bobo 44

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Post #1
19115309 15 Dec 2020 09:40

Hello
Such errors have been popping up for some time regardless of the time of day. When such an error occurs, the main differential at home goes out. I understand the errors, but why is the differential blowing out, the installation is connected right after the differential in the switchboard.

Company Account:
B&B
Ładna 40a, Wodzisław śląski, 44-300 | Company Website: bendb.com.pl

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#2 19115414 15 Dec 2020 10:45

kosmos99 kosmos99

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Post #2
19115414 15 Dec 2020 10:45

There is some current leakage somewhere. For inverters, a differential with a leakage current of 100mA is recommended. The one you have should have a value of 30mA, which is three times more sensitive.
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#3 19115449 15 Dec 2020 11:02

bobo 44 bobo 44

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Post #3
19115449 15 Dec 2020 11:02

That's right, mine is 30 mA and there is no other one in the installation.

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Ładna 40a, Wodzisław śląski, 44-300 | Company Website: bendb.com.pl
#4 19115748 15 Dec 2020 13:40

kosmos99 kosmos99

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Post #4
19115748 15 Dec 2020 13:40

An extra one should only be added to the inverter circuit.
Of course, it's best to check if everything is fine with the installation and the inverter.
#5 19115915 15 Dec 2020 14:55

Cytro12 Cytro12

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Post #5
19115915 15 Dec 2020 14:55

I also have 30mA and there is nothing wrong, I need to check the installation and grounding.
#6 19116147 15 Dec 2020 16:36

noja102 noja102

Level 24

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Post #6
19116147 15 Dec 2020 16:36

@bobo 44, post photos of the boxes next to the inverter.
#7 19116524 15 Dec 2020 19:02

3301 3301

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Post #7
19116524 15 Dec 2020 19:02

Grid OVP, UVP, OFP, UFP means too high and too low AC voltage and too high and too low frequency, perhaps there are some anomalies in the grid.
The inverter power supply should be connected before the residual current circuit breaker, of course through overcurrent protection.
Download the AC voltage and current parameters from the inverter and check whether these parameters differed from the time when the inverter was working correctly before the error occurred.
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#8 19116594 15 Dec 2020 19:30

prose prose

Level 36

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Post #8
19116594 15 Dec 2020 19:30

In Sofar, such errors appear when the AC is disconnected. I checked it on my own.
#9 19117877 16 Dec 2020 11:51

bobo 44 bobo 44

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Post #9
19117877 16 Dec 2020 11:51

There were machers from the company and they said that they would connect a 100mA differential on the set, I'll see what it will do. When this error appears, the differential goes out, but after turning off the inverter, everything works fine.

Company Account:
B&B
Ładna 40a, Wodzisław śląski, 44-300 | Company Website: bendb.com.pl
#10 19117915 16 Dec 2020 12:14

Cytro12 Cytro12

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Post #10
19117915 16 Dec 2020 12:14

If the RCD trips, something is wrong, maybe the insulation is damaged somewhere and there is a short between N and PE, or a bad connection of the differential switch and/or inverter. Have them check the type of network you have with the instructions for connecting the inverter. Increasing the sensitivity may mask the problem, but it will not solve it.
#11 19117949 16 Dec 2020 12:34

kosmos99 kosmos99

Level 38

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Post #11
19117949 16 Dec 2020 12:34

bobo 44 wrote:
There were machers from the company and they said they would connect a 100mA differential

But I understand that this will be an additional differential, not the existing one?
#12 19118004 16 Dec 2020 12:59

prose prose

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Post #12
19118004 16 Dec 2020 12:59

100mA is recommended for some inverters.
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#13 19118017 16 Dec 2020 13:08

bobo 44 bobo 44

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Post #13
19118017 16 Dec 2020 13:08

Yes, it will be an additional differential only on the set, bypassing the one in the normal installation.

Cytro12 wrote:
If the RCD trips, something is wrong, maybe the insulation is damaged somewhere and there is a short between N and PE, or a bad connection of the differential switch and/or inverter. Have them check the type of network you have with the instructions for connecting the inverter. Increasing the sensitivity may mask the problem, but it will not solve it.

The set is connected directly with a cable to the home switchboard behind the differential switch. If the cable connecting the inverter to the grid were damaged, it would trigger all the time, and this could be called "spontaneous".

Company Account:
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Ładna 40a, Wodzisław śląski, 44-300 | Company Website: bendb.com.pl
#14 19118908 16 Dec 2020 19:51

Cytro12 Cytro12

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Post #14
19118908 16 Dec 2020 19:51

bobo 44 wrote:
if the cable connecting the inverter to the grid were damaged, it would trigger all the time, and this could be called "spontaneous".

Maybe the RCD is connected incorrectly, a common error is incorrect N pairing.
#15 19299204 05 Mar 2021 19:38

bobo 44 bobo 44

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Post #15
19299204 05 Mar 2021 19:38

I ended up replacing the inverter with a new one with new software.

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Ładna 40a, Wodzisław śląski, 44-300 | Company Website: bendb.com.pl
#16 20137324 10 Aug 2022 12:57

gawkosg gawkosg

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Post #16
20137324 10 Aug 2022 12:57

I have the same problem with two inverters, both of them behave this way independently. Sometimes it trips the RCD on one, sometimes on the other and sometimes both at the same time 😞. There are 11 panels under each inverter with a total power of 4.95 kWp. Maybe someone can suggest what to do about it?
#17 20231145 11 Oct 2022 12:06

e_majsterkowicz e_majsterkowicz

Level 10

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Post #17
20231145 11 Oct 2022 12:06

The differentials used were 30mA or 100mA?
#18 20541806 16 Apr 2023 09:55

Przemek22tex Przemek22tex

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Post #18
20541806 16 Apr 2023 09:55

I have a problem with the Sofar 3 kW 1-phase inverter. Often, when the sun comes out from behind the clouds at noon, Grid OVP, UVP, OFP, UFP errors appear. I switched to a phase with a lower voltage, but during operation the installation does not exceed 240 V. I don't know what the problem is anymore, because it can trip the inverter several times a day, and since it is in the attic, it is annoying to have to constantly run and reset it. Could this be the fault of the inverter itself? I will add that the differential and protection devices have never tripped for me.
#19 20541923 16 Apr 2023 10:58

3301 3301

Level 34

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Post #19
20541923 16 Apr 2023 10:58

These errors result in: too high and too low AC voltage and too high and too low frequency. Maybe the network is working on the generator, but you need to download the parameters from the inverter from the export tab and analyze when the shutdown occurred and at what indications.
#20 20555013 25 Apr 2023 16:58

somzol1981 somzol1981

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Post #20
20555013 25 Apr 2023 16:58

Hello Guys. I have the same issue. Every now and then shows a OVP alarm. Installer blames the manufacturer. Manufacturer blames the installer. Do you have any solution?
#21 21825127 31 Jan 2026 13:37

brratek brratek

Level 11

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Post #21
21825127 31 Jan 2026 13:37

On my Sofar 1 phase I got a uvp error even though it had been working for years without any problems, when it caught up one time it turned out that the voltage on this phase was 197 v
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Topic summary

✨ The discussion revolves around troubleshooting differential tripping issues related to Sofar inverters, specifically errors such as OVP (Over Voltage Protection), UVP (Under Voltage Protection), OFP (Over Frequency Protection), and UFP (Under Frequency Protection). Users report that these errors cause the main differential to trip, often linked to current leakage or grid anomalies. Recommendations include using a 100mA differential for the inverter circuit, checking installation integrity, grounding, and ensuring proper connections. Some users suggest that the inverter may be at fault, while others emphasize the importance of analyzing AC voltage and current parameters during operation. The conversation highlights the need for thorough checks of the installation and potential issues with the grid supply.
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FAQ

TL;DR: 30 mA RCDs are 3× more sensitive than 100 mA; "For inverters, a differential with a leakage current of 100 mA is recommended." Recurrent Sofar Grid OVP/UVP/OFP/UFP with RCD trips usually indicates leakage on the inverter circuit. [Elektroda, kosmos99, post #19115414]

Why it matters: This helps Sofar PV owners quickly stop nuisance trips, recover uptime, and fix safety-critical wiring or grounding issues.

Quick Facts

OVP/UVP/OFP/UFP codes flag out-of-range AC voltage or frequency conditions on the grid. [Elektroda, 3301, post #19116524]
Sofar may also show these codes when the AC side is disconnected. [Elektroda, prose, post #19116594]
Use a dedicated RCD for the inverter circuit; avoid mixing with house loads. [Elektroda, kosmos99, post #19115748]
Typical choice: 100 mA RCD; a 30 mA device is 3× more sensitive. [Elektroda, kosmos99, post #19115414]
Pull trip data from the inverter’s Export tab to correlate faults with grid values. [Elektroda, 3301, post #20541923]

What do Sofar Grid OVP, UVP, OFP, UFP codes actually mean?

They signal grid voltage or frequency outside allowed limits. OVP/UVP are voltage, and OFP/UFP are frequency. One expert explains, "Grid OVP, UVP, OFP, UFP means too high and too low AC voltage and too high and too low frequency." Check grid conditions when the fault appears. [Elektroda, 3301, post #19116524]

Why does my 30 mA RCD trip whenever these errors pop up?

RCD tripping indicates leakage current on the inverter circuit. A 30 mA device is three times more sensitive than a 100 mA one, so it trips sooner. The thread notes leakage as a likely cause during these faults. Address wiring, insulation, and the inverter’s connection. [Elektroda, kosmos99, post #19115414]

Should the inverter be on its own RCD?

Yes. Put an extra RCD only on the inverter circuit. This isolates inverter leakage from household circuits and reduces nuisance trips. As one expert says, "An extra one should only be added to the inverter circuit." Verify the installation integrity as well. [Elektroda, kosmos99, post #19115748]

Which RCD rating should I choose for a PV inverter, 30 mA or 100 mA?

Many inverters work better with a 100 mA device to avoid nuisance trips from normal leakage currents. "100mA is recommended for some inverters." Always follow the inverter manual and local code before changing protection. [Elektroda, prose, post #19118004]

Where should the inverter connect relative to the main RCD?

Connect the inverter supply before the main residual current device, with proper overcurrent protection. This arrangement helps prevent the house RCD from tripping on inverter events. Confirm compliance with local regulations. [Elektroda, 3301, post #19116524]

How do I use Sofar logs to find why it shut down?

Export and correlate data with the shutdown time.

Open the inverter’s Export tab and download AC parameters.
Note the exact time of each shutdown.
Compare grid voltage and frequency at those times to limits. This pinpoints a grid versus installation issue. [Elektroda, 3301, post #20541923]

Can a miswired neutral (N) cause nuisance RCD trips?

Yes. Incorrect neutral pairing or mixing neutrals across RCD-protected circuits can cause false trips. Inspect the RCD wiring, especially the neutral path, and correct any cross-connections. This is a common installation error with inverter additions. [Elektroda, Cytro12, post #19118908]

I see Grid OVP/UVP/OFP/UFP when sun bursts through clouds, but no RCD trip. What then?

The inverter is detecting out-of-range grid conditions. Export inverter data and verify the grid voltage and frequency at those moments. Correlate trip time with values to confirm a grid transient. This evidence guides your installer or utility. [Elektroda, 3301, post #20541923]

Could replacing the inverter fix persistent trips and errors?

Sometimes. One user resolved repeated issues by replacing the Sofar unit with a new model running newer firmware. Hardware or software updates can stabilize protection behavior. Verify root cause first to avoid unnecessary swaps. [Elektroda, bobo 44, post #19299204]

Will changing RCD sensitivity solve the problem?

Changing the RCD alone can mask an underlying fault, such as insulation damage or N-PE issues. Have the installer confirm your network type and wiring per the inverter manual. Fix the cause before altering protection. [Elektroda, Cytro12, post #19117915]

Two inverters trip different RCDs randomly. What should I check first?

Give each inverter its own RCD and verify the installation. Shared or mixed circuits escalate leakage and trip risks. The advice is clear: add an extra RCD only to the inverter circuit, then validate wiring and the inverter. [Elektroda, kosmos99, post #19115748]

Do these grid error codes also show up if AC is disconnected?

Yes. A user verified that Sofar displays these codes when the AC side is cut. "In Sofar, such errors appear when the AC is disconnected." This is an expected edge case and not necessarily a fault. [Elektroda, prose, post #19116594]

Is a 30 mA RCD acceptable with a PV inverter?

Some systems run fine on 30 mA, provided grounding and wiring are correct. One user reported no issues using 30 mA after checking installation and earthing. If nuisance trips occur, investigate leakage and connections. [Elektroda, Cytro12, post #19115915]

What info should I share to get fast help from installers or forums?

Post clear photos of the AC/DC boxes near the inverter and the switchboard. Include RCD ratings, wiring routes, and the inverter’s error log timestamps. Visuals accelerate diagnosis and reduce guesswork. [Elektroda, noja102, post #19116147]

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