I’d still steer clear of the Growatt, just because I had one (not the particular one you are looking at) and documentation etc. around it was horrible. This was a few years ago, maybe they’ve upped their game.
I know that JHB is a different municipality (and city), but it was purely used as an example. They didn’t have any regulations around inverters until the DA took power at the municipal level. Then they got a “list”, pretty much the same as the CoCT one. Technically they always had regulations around solar but it wasn’t enforced (or something like that).
All I’m doing is letting you know that there are regulations to comply with, parts wise as well as installation wise, and for it to “work” isn’t necessarily legal. When I was getting ready to install my solar system, I contacted an installer who did a great job, but the system would not have complied - I just assumed that the installers understand the regulations.