The kit I got was Traxide D3-BS which is the SC80-LR isolator for protecting the cranking battery and the ABG-25 isolator, a low voltage cut-out, for protecting the auxiliary battery from being accidentally over discharged.
http://www.traxide.com.au/complete-...discovery-3-dbs-kits/d3-bs--sc80--abg-25.html
The SC80-LR is a version of the new SC80-CB with an external breaker for easier install.
http://www.traxide.com.au/isolators/sc80---90-amps-standard.html
It supports some nice features. It is not a DC to DC charger. Both batteries can be used for accessories until the cranking batt is isolated (At 12v, 50% left, plenty for starting the vehicle). Both batteries charge in parallel via the alternator. The Aux battery can even charge the starter batt via reverse charging. It also supports solar very well.