I'm installing an Aims inverter/charger. It came with a LCD wall monitor. Diagrams show both a shunt installed on the negative cable battery cable (not a smart shunt). And a breaker/fuse on the positive leg. So I'm not sure why a shunt on the negative cable if its not a smart shunt to be plugged into a monitor. I will be installing a fuse (300amp) on the positive cable. Any ideas on the shunt is appreciated.