Thanks guys, and welcome to you to this board, Cyril.
Glad you like to follow this 'loooooooooong story'. Sorry for the lack of update, I really have all the materials for many pictures and a lot of details, but I just don't have enough time
... anyway, I'll do my best to update more often!
OK, before the coming of 'ombrenoire' for the electricity part, we need to bring power from the source of my house, into the V3.
So, let's re use the trench done few years ago for the V1...digging time
(you can guess on the picture the existing red 'V1' pipe)
Of course, we have to extend the trench to the V3.
Not sure so far how much power I'll need for all my stuff, but it any case, the new cable will have to start for the main power arrival into my house, so If I have to upgrade it (more power) if needed, the cable will be on the perfect location.
And the famous hole done in the V3 for the new cable to come of course