MarkJ
Forum Member
I’ve been staring at the attached drawing for about 30 minutes and wondering about it. (The drawing is a crop from a schematic on the Victron site, but the principle applies to other makes).
My schematic was subtly different: I had one logical negative busbar (actually two physical components, joined - one for low current loads and one for high current stuff) with the shunt the ’last’ thing before earth. Victron have a negative busbar dedicated to the batteries and another busbar for all other negatives; these busbars are connected by the shunt (I think). So all the negatives for loads and chargers are direct to chassis earth, on the earth side of the shunt.
Why do it this way? Is it that you get a purer measure of battery current? For example if you have the charging current from the mppt going through the shunt I guess that would be confusing? Most schematics you see don’t show the negative wiring very clearly, but one I was looking at elsewhere had a mix of negatives : some directly connected to chassis earth, others to the non-earth side of the shunt. Confusing, or am I being dense?
My schematic was subtly different: I had one logical negative busbar (actually two physical components, joined - one for low current loads and one for high current stuff) with the shunt the ’last’ thing before earth. Victron have a negative busbar dedicated to the batteries and another busbar for all other negatives; these busbars are connected by the shunt (I think). So all the negatives for loads and chargers are direct to chassis earth, on the earth side of the shunt.
Why do it this way? Is it that you get a purer measure of battery current? For example if you have the charging current from the mppt going through the shunt I guess that would be confusing? Most schematics you see don’t show the negative wiring very clearly, but one I was looking at elsewhere had a mix of negatives : some directly connected to chassis earth, others to the non-earth side of the shunt. Confusing, or am I being dense?