Extension-cord use and ground-mounted panel: one category. Fixed wiring, earthing, RCCB: from there it's a different game — and not DIY.
Installation
Practice and limits
Ground mount, shade-free placement, wind — and what not to DIY with the household grid.More numbers and realistic examples
If you want to know how to calculate cold Voc, or why the 400 W label isn't enough: registration brings new materials and calculators.