As part of self build on my Master II probably £200 for the 240v side. input socket, circuit breaker, sockets, 2.5 twin & earth.
Lighting is on the 12v side which is fairly basic with a split charger feeding just one 80 amp hour battery, 3 core 1.5mm cable, fuse block. all in probably £150 which is less than some on here might have paid for one of a pair of Batteries or a smallish solar panel. the 12v side can run into serious money if you plan to do lots off site.
