Multiple Shunts

[CharlieJ]

Zil #14
The Victron smart shunt has electronics embedded in it; it is not a simple, precise shunt as is used with most other battery monitors, ammeters, etc. The calculations are performed by the electronics in the smart shunt and and the info is sent to the readout over a standard UTP cable. The electronics require B+, hence the connection.

[Zil]

Thank you. Sure can't use that shunt for the other stuff.

[goboatingnow]

Originally Posted by CharlieJ

Zil #14
The Victron smart shunt has electronics embedded in it; it is not a simple, precise shunt as is used with most other battery monitors, ammeters, etc. The calculations are performed by the electronics in the smart shunt and and the info is sent to the readout over a standard UTP cable. The electronics require B+, hence the connection.

Im not sure this is right, the quick connect PCB can be fitted to the Victron which makes connecting the BMS handy, the B+ line is added so that the BMS can be fully wired and powered by using the UTP cable and connectors

There is no additional electronics on the shunt , its just a standard 50mV shunt like everything else. it can quite happily be used without the quick connect PCB

The panel meters could use this shunt if they are 50mV types ( or there is a calibration procedure)


dave

[CharlieJ]

go-
You are correct, this is a simple shunt with a PCB attached to the side of it.

As packaged, my description is correct; i.e., the connection between the shunt and the meter is an RJ 12 UTP cable so only information is transmitted to the readout.

But you are correct, it is fundamentally a 50mV/500A shunt so using twisted pair cable and measuring the voltage drop across the shunt and then using this IR drop as an input to an appropriate meter is certainly feasible.

[Hkalan]

Hello,

I installed one 75mV shunt and have the Victron 50mV shunt in.

Connected one meter to the 75mV shunt. Took the reading.

Connected a second meter to the same shunt. All readings were unchanged. I did pre cut the wires to each meter, and they are not the same length to where they will be permanently installed.

Hooked up a third. All readings unchanged. As the 3rd is for testing only. I put on a 2 pole isolation switch, for a quick disconnect.

Put a load on (fresh water pump with water running). Took the reading then Isolated the 3rd meter... All readings unchanged with and without the third.

I only need the 2 meters with the Victron, so the 3rd is back in the spare pile !

For the test, I got power from the engine bank to power the display.

Thanks for your feedback !!

Alan