If you're thinking about installing a Waeco compressor fridge then don't do what I did.... Without reading all the literature, I steamed ahead and wasted a lot of time running a cable from the leisure battery to the fridge via a suitably sized fuse and a switch. I matched the cable size to current draw of the fridge, and added a bit for luck! 1.5mm would be plenty I thought. Wrong! As it turns out this clever little fridge monitors volt drop and automatically switches off when the voltage drops below a set point (I think it's 10.7V) so as to protect the battery. Therefore Waeco advises the installer to use 6mm cable to avoid any losses. That's a big lump of copper! But that is what's required unless anybody can tell me they've got away with using something smaller.