question

teoball avatar image
teoball asked

bmv-712 and 2 AMG batteries in a boat

I am going to install a bmv-712 smart shunt in my boat.

As I understand it I have to connect the negative side of the batteries to the "Battery" side of the shunt. Am I doing something wrong if I do this (my red line)?

bmv-712.jpg

BMV Battery Monitor
bmv-712.jpg (36.7 KiB)
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

2 Answers
markus avatar image
markus answered ·

You will measure the current, going to and coming from both batteries.

It will not be possible this way, to get a good SOC value for one battery.

BR

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

randy-putnam avatar image
randy-putnam answered ·

I agree with Markus. Run run the neg cable of the house/auxiliary battery to the neg only side of the smart shunt and let the control cable you have hooked to the start battery measure voltage and temp only. You will get state of charge of the start battery by knowing the voltage in that battery. I am assuming you have an alternator to charge the start battery.

2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Related Resources

Additional resources still need to be added for this topic