BMV-712 alternative ''B1'' wire connection

DIY
1

Hi. I’ve just seen a diagram where the small red wire (‘‘power cable’’) that’s connected to the B1 terminal of the smart shunt goes directly to the Lynx Distributor positive bar instead of going to the battery/battery bank positive terminal.

I suppose it’s ok considering this is NOT a temperature sensor destined to be connected to the batteries but a simple cable reading the charge voltage ?

Just to confirm; I like to keep things tight and since my shunt is connected directly to the Lynx, that’s be a simple connection to do instead of running to the batts.

Thanks !

2

That wire only measures the voltage.

To measure the temperature you would need a temperature sensor.

3

SO : I can plug it wherever in the diagram for as long as it goes to Positive pole of my battery bank then ?

I’m asking because I’m concerned about these micro-ohms of resistance that might affect the readings (or not) depending of where I hook up the wire.

I know, as indicated, I’d need a temp sensor to read temp.

Thanks

4

For an accurate reading the wire should be connected as close as possible to the battery (same for the negative - the shunt itself).
If the wire from the battery to the Lynx is big enough than there shouldn’t be a significant voltage drop.

1 Like
5

Good then ! I’m running a 19’’ (50cm) 4/0 wire for 200Ah total so I’m probably amply covered :grinning_face_with_smiling_eyes:

Thanks again !