Solar panels and batteries for the box van

Today we were able to finally assemble the solar panels to the roof. I have explained how we wired the batteries and what equipment we got. I will write it all down in this post so you can check what you might need.
I'm a bit worried about the weight of it all since the bars are metal and the panels aren't that light either. We will invest into an inverter as well very soon. So I'll keep you posted on that.