We use Sargent power management system. It has a battery charger; mains output (RCD) protection and 12v fuse protection all in one unit which makes it easy to use and understand.
Mains inlet connector with flap. Can be colour coded.
12v DC Socket for phone charging, laptops and other electronic devices.
Satin Chrome 13A 240v Socket.
We fit 110ah leisure battery because anything smaller just doesn't last.