We are lucky to have someone here gives a help in doing the electric connection. He mainly helped us to do all the connection in the fuse box. Later we made a hole through the floor, we had to pull the main cable from the fuse box through the floor, connected with the plug under the house, fix the plug in a good position and put silicon close the gap around the cable. We tested our plug few days ago, everything worked fine. I was so happy that it worked, I had actually no idea at all in the beginning about electrical connection, I gathered information here and there, asked people who know about it, tried to figure everything out from scratch.
You can read about the wiring plan here – https://flowwiththetiny.home.blog/2019/07/06/week-4-1-wiring/
We didn’t do the wiring in a professional way but it works….