I have made three posts on the website which gives you the outline of the legality of installing solar and the electrical systems.
Its not detailed but those who can, or would learn or look it up there are plenty of "bullets".

most installations  should be fairly straight forward, but most people never have electrical inspections carried out. Wiring can go bad, there can be hidden issues and there can be a wild mix of wiring and installations all in one house. Your pants can be caught down if your not careful.

Reading it and doing it can be different. I must admit I miss things that I take for granted, so it may catch you out, so make sure you do your own research and I take no liability of your actions.