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bertschb avatar image
bertschb asked

Need help connecting negative battery cables to BMV-712 shunt with two 12v RV batteries in parallel.

I'm installing a BMV-712 in my RV. I have two 12v batteries connected in parallel. I was going to connect both battery negative wires to the "Battery" post on the Victron shunt. But, the quick start guide shows the negative wires from each battery going to opposite sides of the shunt. The quick start guide referred to the second battery as a starter or auxiliary battery. In my case, it's neither of these. My question is do I connect both negative battery cables to the "battery" side of the shunt or one on each side of the shunt?

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2 Answers
Paul B avatar image
Paul B answered ·

Both neg wire to the battery side of the shunt is correct all other Neg wires NO matter what to the load side of the shunt.


If you need any further help please post a diagram of the setup

Thanks



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donaldn01 avatar image donaldn01 commented ·

I am considering a similar set up with two 100Ah batteries in parallel. Do I set the battery parameters as 100Ah or 200Ah because each one is 100Ah.

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rft avatar image rft commented ·

@Paul B I have the same question as OP but I am a little confused about both Neg wires going to to shunt as in your reply. Here is a diagram from AM solar. Batteries are wired in Parallel and shows only one Negative cable to battery side of shunt. IS the better option to run two Negative to shunt or wire as in diagram?

Thanks.

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jveiga avatar image jveiga commented ·

Hi there, wondering how I do this. Below is my setup as it stands. Having a hard time figuring out where I'd place the shunt. My Group 1 is basically all over the place. Where would I place the shunt to monitor that group? (the black and red big dots are basically busses)

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escapade-nawlins avatar image
escapade-nawlins answered ·

Not an answer just a question...Is group 27 really an 800A battery? Do you mean cranking amps and not AH correct

?

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