I use 2 of these modules and I am very satisfied. There can never be enough electricity. The technical details match the yield. Apart from the fact that I have mounted the modules horizontally on the cabin roof, I get 10A in very good weather. The price is pretty steep, but I'm very happy with that.
It's really worth paying a little more and buying a German product. If you look at the Asian providers on the Internet and what users write about them (including photos!) You get otherwise. Good workmanship, the price at SVB is only minimally above the Internet. But it's worth it, because Mr. Wolfgang Pohl gave great advice. Took time and answered all questions patiently.