I have my solar charging at the same time as the inverter is drawing along the neg wire between the Trimetric shunt and the battery. But before that they use separate neg wires to the far end of that shunt, and their positives take separate paths to the battery.
The Trimetric does not record "net" amps, but only the amps to the battery left over from other loads drawing on the solar or charger. If the loads exceed the solar amps, then the Tri shows minus amps from the battery to make up the difference.
The issue (if there is one) is what happens on a single wire with amps going one way and amps the other way--do you get net amps or does it get the solar controller mixed up as to what the battery voltage really is? I don't know, and am hoping the guys on here can explain it.
