hi guys and happy new year

..... getting there with my mk 7 swb camper/dayvan conversion and am coming to the electrical side of things, i want the leisure battery to charge while driving and while on hook up, i dont need a fridge and will need to power led 22 led lights in the roof lining, flip down dvd, i need a double 240 socket, i'm thinking of buying a pms3 unit and split charge relay, will this be suitable or can anyone recommend anything else as i,m a bit dumb when it comes to electrics

??????