Amazon.com: Dual Battery Isolator Kit 12V 140Amp Manual and Auto modes Voltage Sensitive Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats,Not Fit for lithium batteries :
Victron Energy ARG100301020 Argofet 100 Amp Diode Battery Isolator for three batteries
Eaton's Sure Power 702 Multi Battery Isolator | Waytek