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BMV712 shunt wiring for 2 banks - sense check


20210822-102937.jpg Hi

I have installed a Victron BMV712 on my boat and the guys doing the final connections have wired two negative wires to the shunt 'battery' post. I wanted to sense check this with you if possible please? In my fancy diagram you will see that I originally planned to have the STB start batteries negative attached to the load side of the shunt...

I hope my diagram and pictures make sense. I have a house bank of AGMs that the BM is monitoring, but the 3 way switch allows me to call on the starboard starter batteries for reserve power if I ever need it.

My query is that the two bank's negative wire is on the battery side of the shunt. Is this a problem if I do not use the starter batteries? I am not worried about the BM being out of whack for the super rare time that I use STB starters in an emergency.

Thanks for your help

Tony
in Tassie



20210822-102937.jpg
BMV Battery Monitor
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20210731-171619.jpg (3.7 MiB)
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klim8skeptic avatar image klim8skeptic ♦ commented ·

The only problem that I cant see, would be if the house battery's negative is connected to the chassis.

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tonus72 answered ·

Hi. I hope this helps - x for positive, negative circled. 4 x 6v batteries. Cheers. Tony20210822-153717.jpg


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klim8skeptic avatar image klim8skeptic ♦ commented ·
The shunt wiring looks correct.

However the color coding for the battery cabling is just an accident waiting to happen, black cable/covered with black split loom going to the batt pos, and a red cable going to the batt neg :(..

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tonus72 avatar image tonus72 klim8skeptic ♦ commented ·
Hmmmm, yes..... wasn't rapt with that! A bit of effort wasted.....



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