How do I install BMV-702 with two 12v batteries in parallel?

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thub asked May 20, '19

How do I install BMV-702 with two 12v batteries in parallel?

I am confused by the Installation Guide for my new BMV-702 to be setup with an auxiliary battery. The Guide shows both battery positive terminals connected “to load”. I only have a single wire supplying power to my travel trailer. Don’t I need a battery cable connecting the two 12v battery positive terminals in order to get the capacity benefit of having the two batteries in parallel? I prefer to connect the load wire to the auxiliary battery – but does it matter?

BMV Battery Monitor installation

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Answer 1 · 2019-06-01T08:04:31Z

Paul B answered · Jun 01, 2019 at 08:04 AM

if in parralle then the negative leads from BOTH batteries go the the battery side of the shunt

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marco-russian commented · Jan 29, 2021 at 07:48 AM

So instead of connecting the negatives on each battery to each other both go to the Shunt? do you have a diagram to explain this?

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Matthias Lange - DE ♦ marco-russian commented · Jan 29, 2021 at 08:14 AM

https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf

wrong:

right:

The yellow point is where the Shunt should be.
We mostly use the "diagonally" wiring.

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