I have 12v starter battery in the freda. I want to add a leisure battery, that will charge from the starter system, but also charge from a 240 hook up when on site. The leisure battery will run the interior lights, fridge/coolbox, 12v tv (eventually) and mabe some usb chargers and other stuff etc. there shouldn't be a huge draw and I probably wont wild camp, so a 110ah battery should be more than sufficient for when I am not plugged in.
I was thinking of something like the following set up:
leisure battery connected to starter via split charge relay, powering the 12v gubbins via a fused control panel with battery level display. Leisure battery connected to a trickle charger, powered by an rcd'd 240v connection when on site.
Any thoughts welcome. If this works I can do a how to guide (as there doesnt seem to be one in the members area specific for the bongda (which is what i am going to call the bongo/freda from now on!!)

Thanks,
Lenny