Hi,

My sister and her family (husband & 3 kids) just bought a camper trailer to introduce the kids into camping.

I'm helping them setup their duel battery system. They will more likely start with easy access places and powered campsites.

I need to know if i set up the entire system to run "off grid" using the battery on the trailer (with dc-dc charger when car is running), how can I best charge the battery when on a powered site from the mains 240v without disconnecting the battery and or accessories? (using a modern battery charger while running accessories eg fridge will damage cells from what i know)

Regards
Richard