I live in Belgium and cloudy days are in abundance here (except now in the middle of summer). I know PV cells still produce some usable power on cloudy days, but I was wondering if these water heating panels still heat the water. I tried searching for it here, but figuring out what search terms to try for this particular question seemed too difficult.
I'm hoping (read: I'm certain) someone here has experience with this and I would be grateful with some real data.
I could do some tests myself, but in the middle of summer we are blessed with less to no clouds, so it would take me a couple of months to test.
Sven