PJHassselt

I have all circuits separated. On this circuit is only the fish pond. And only this circuit trips Probably I should start a new topic? And let Itsari use this topic? Kind regards, and thanks for help!!

It looks like Itsari took over my post..... I hope my post help him to solve his problem.... To answer some initial questions: In the past it worked OK. The problem started after heavy rain. So damp inside the box where the pump is connected can be an issue. Every circuit in my house is equipped with its own RCD. The main breaker does not have a RCD. I understand the RCD opens when it is dampy. I understand the RCD stays closed when I change the power supply from grid to my own inverter. I do not understand, and that was my question, when I run just a very short time on my own inverter, (a few seconds is enough) the breaker stays closed (ON). We hire sometimes a very capable electrician (capable as far as I can judge) and he has also no clue..... Best regards.

Hi all, I have this strange issue. Our fish pond has pumps, pumps are connected to the power in what should be a water closed box, but with heavy rain the box is dampy inside. So when heavy rain often the RCD opens. No problem. I understand why this happens. The last few days the RCD also disconnected when there is no rain. Always in the late afternoon, or early evening. I still thought because some damp issues. When the pumps do not run the whole night, I am afraid my fish will not survive. So then I switched to our solar inverter. Then the RCD stays in (also normal I once learned, no common ground, or something like that) Then in the morning back to the grid, and no problem till the next afternoon/evening. This I all understand. But now the strange thing. I discovered that when the RCD opens, I am unable to close (It opens direct again) Then I power on the inverter, and the RCD stays closed. But.... When I then direct power off the inverter, and go back to the grid, the RCD stays closed (So all works fine) and it stays closed for the whole night. Like switching on the solar inverter resets something? Anyone an idea where to look? Kind regards.