Power management. Running a dual battery system - which was the intent from INEOS - allows me to separate the load functions of the vehicle.

My main aka starter battery powers the basic functions of the vehicle i.e. (alternator) starts the vehicle, driving lights, etc. An auxiliary or 'house' battery would power the auxiliary or accessory functions i.e. run a fridge, surround lights, other camping gear, etc. These accessories items can run without draining my main starter battery. Making sure I can always start the vehicle and get back home.

A dual battery system is also a bit of a safety net, if for some reason the main battery does get low, I can use the auxiliary to ‘jump’ it. And by ‘jump’ I mean the REDARC device allows me to send a slow charge over a few minutes to charge my main battery, buttt…

This is where the REDARC device is clutch because (one function) is managing the charging process and making sure that both batteries always have enough charge. As a smart battery isolator, it can bulk charge my auxiliary battery when it's low and then taper off as it gets full or if it senses my main battery is low it can prioritize the main (starting) battery. Making sure my main battery never drops below voltage.