Shunt Wiring

[johnplyler]

I am down to connecting the shunt on my Victron BMV-712 Smart battery monitor. Due to the signal/communication wiring on the shunt, it would be a much cleaner layout if I could connect it backwards on the negative battery cables, just flipping the shunt. There are two sets of communication leads, I could keep them correct. I would just be reversing the two large top bolts that connect the battery to the inverter/charger.

Would anyone venture as to guess what would happen?

Many thanks,
John

 

[William_H]

The shunt is just a resistor, not polarised. Sop fit the shunt either way. However it is the relationship of the sensor wires to the current flow that matters. So if I read you correctly shunt can fit either way. But perhaps I have got it wrong as a shunt is norm ally symmetrical anyway. Perhaps better explanation needed. ol'will

 

[johnplyler]

Thanks, I just figured it out. I can flip the circuit board. In fact I just did it and it worked.

 

[VicS]

Thanks, I just figured it out. I can flip the circuit board. In fact I just did it and it worked.

I think William may be overlooking the fact the shunt is prewired for the plug in cable connecting it to the monitor..

Are you sure yo u are not seeing a charge as a discharge and vice versa. That is what I would expect if you simply swap the battery connection and the load connection over.

If I'm right the current which the monitor itself draw will be taken from the wrong end of the shunt. That is very small so the error it causes will probably be insignificant.