Hello. I want to install a Victron Smart Shunt in my Airstream. The two lithium batteries are located outside in the battery box and 2 negative wires come into the coach. One goes to the Inverter and the other to negative bus. Can I connect those two negative cables from the batteries to the battery side of the shunt? Or do I absolutely need a single cable from the batteries to the shunt? Thanks.
Yes. You can.
No. You don't.
However the connection is made, it's critical that the battery be the only thing connected to that side of the shunt, with all loads, sources and ground on the other side of the shunt.
Consider that two wires will require over-current protection on each. If the gauge is sufficient, I would simply run one wire from the (-) terminal to the shunt and then from the load side to the DC bus.
The two lithium batteries are located outside in the battery box and 2 negative wires come into the coach. One goes to the Inverter and the other to negative bus.
Assuming batteries are in parallel.
Each wire comes from the same battery post (and the batteries are connected in parallel with another wires)?
Or each wire comes from each battery (and there is no other connection between the two negative battery posts)?
