Victron Energy Argodiode Battery Isolator 120-2AC. Two batteries, 120A
Victron Energy Diode Battery Isolator Argo 1202AC. Two batteries, 120A
Diode battery isolators allow simultaneous charging of two or more batteries from one alternator, without connecting the batteries together. Discharging the accessory battery for example will not result in also discharging the starter battery. Low voltage drop due to the use of high efficiency Schottky diodes.
Datasheet: Argodiode Battery Isolators