Boathook
Well-known member
I did that years ago. Had to add a bigger switch panel a few years back plus work another route for extra wires as in one section I couldn't add extra trunking !When I designed the electrical system my boat about 20 years ago I tried to include equipment to allow expansion of I included 10% extra switched and spare wiring.
I now have no spares left and even during wiring I had to increase the size of trundling and add extra trunking
If I were to do it again (which I won't) I would try to think all I may need then double it and then double it again and expect to runout at some time in the future