Having a issue with the GFCI tripping while RV is in for service inside the building. We are using 2 quattro 12v/5000 inverters in a split phase configuration with l2 returning to original. We do not have room to add a isolation transformer to the the system. I did see a product called B-stop that could be used but it shows its operating frequency is 50hz, we need something in the 60hz. Is there any way to program the inverters to limit the leakage to under 5mA?
@wiringOCD the B-Stop by Teypra in Italy operates on both 50 and 60 Hz. They only have a 240volt version currently but are working on the 110volt version for release soon.
The tripping threshold of 5mA is very low. The tripping can be explained easily and because you are using a Quattro it doesn’t mean the Quattro is causing the tripping. It isn’t a function of Quattro programming causing the RCD to trip.
When the Quattro is in pass though mode the internal ground relay is open meaning the load leakage is seen on the input so it may be the leakage of the load on the Quattro and not the Quattro that is causing the RCD to trip.
When the Quattro is in inverter mode, the ground relay is closed so RCDs downstream of the Quattro will work. In this case no downstream load leakage will be seen at the input so that leakage is no longer a part of the accumulation of leakage so the RCD in the input doesn’t trip.
To outline the nature of the problem you may be interested to read this paper on why this is happening. https://img1.wsimg.com/blobby/go/98d0535e-71f8-4374-894c-914625b85eda/downloads/RCD%20nuisance%20tripping%2C%20causes%20and%20an%20innovativ.pdf?ver=1721783524558
@Yachtbird Hey, Trevor! Having read your paper, I wanted to clarify whether or not a device of the likes you mentioned exists on the market today. At the end of your paper you mentioned the idea of introducing an inductive current to reduce the capacitive leakage current. Is this something that is possible, and if so, how would I go about it? I am asking to see if I can find assistance in solving a similar issue that I outlined here: Can I use a Victron Isolation Transformer on the input side to prevent GFI's tripping while charging - #7 by SamuelSullivan
@SamuelSullivan Hello, the inductive component mentioned in the paper is provided by the B-Stop. That is the beauty of the B-Stop device as it provides a small inductive current to cancel the small inevitable capacitive current, thus restoring a reasonable trip margin.
They are available from the Italian manufacturer. I know they have 240volt versions and they were some time ago working on a 110volt version for North America so I am not sure if that has been developed yet.
It is a great product for genuine nuisance trip type problems.
I hope it helps you.