Victron BMS 702 installations?

[geewizard]

Anyone else install a Victron BMS 702 with a shunt in their trailer? I have and cannot get it to show any current being used. Voltage is displayed properly but not current.


A wiring issue? I've followed the instructions.

[creativepart]

Have you set it up? Entering total amps, state of charge, etc?

https://www.youtube.com/watch?v=YXbjJzyIFgg

[geewizard]

Yes, all set up.

[geewizard]

Followup to my post:


I did a test installation of my Victron 702 BMS right at the batteries. Everything works properly and I can see current being used when I turn on the furnace as well as current being put into the batteries from the solar panel.


So, be aware that the 12V white ground wire AT THE CONVERTER is not the place to install the Victron 702 BMS shunt to measure current draw.

[creativepart]

Originally Posted by geewizard

So, be aware that the 12V white ground wire AT THE CONVERTER is not the place to install the Victron 702 BMS shunt to measure current draw.

As every connection diagram and video shows, it must be connected directly to EVERY chassis load ground and directly to the Battery's main negative terminal.

ALL negative loads - solar controller, inverter and of course chassis they ALL must go on the load side of the shunt. AND you need to connect the battery side to the battery with wiring of equal gauge. So, if your positive and negative battery cables are say, 2 GA then the cable from the battery side of the shunt must be AT LEAST as thick a gauge.

The shunt is made to handle 500 amps and everything goes through it. So very big cables are needed.

If you run any incidental negative load directly to the battery and not through the shunt then your state of charge will not be accurate.