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

Question

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.

kosmos99 · Answer

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.

bobo 44 · Answer

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

kosmos99 · Answer

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.

Cytro12 · Answer

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

noja102 · Answer

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

3301 · Answer

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.

prose · Answer

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

bobo 44 · Answer

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.

Cytro12 · Answer

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.

kosmos99 · Answer

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

prose · Answer

100mA is recommended for some inverters.

bobo 44 · Answer

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

Cytro12 · Answer

Maybe the RCD is connected incorrectly, a common error is incorrect N pairing.

bobo 44 · Answer

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

gawkosg · Answer

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?

e_majsterkowicz · Answer

The differentials used were 30mA or 100mA?

Przemek22tex · Answer

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.

3301 · Answer

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.

somzol1981 · Answer

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?

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

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