Thread: Solar panell 12volt wiring

Currently been building a portable hut and want to put 12v power in it. Have a solar panel to go on the roof etc but just want to run cable in the walls before lining.
All am want is a couple of points with usb for charging and i will also put in a female cigarette plug and a single light on the ceiling. Hopping i can just get a standard light bulb in 12v to fit a bayonet light fitting??
So what size 12v wiring do i need?? right back to the battery. Will sort out cable from solar panel etc at a later date