I have a bank of two 12 v batteries connected in parallel. Apart from the two connector cables between the batteries, there are connections to loads or chargers on each the 2 positive and 2 negative battery terminals. Judging by the different cable diameters, these connections are in pairs and dia…

I have a similar (probably rookie) question. I have two 12 v batteries connected in parallel with jumpers. I understand all negative load and charging cables will get moved to the appropriate side of the shunt. On the battery only shunt connection, does the jumper matter? Or since the batteries ar…

You need to leave the jumpers in place. You must move all negative battery connections to the “charge and load” side of the shunt. Then you need to bring together all positive connections on the positive of the OTHER battery younegative of one battery, via the shuntll négative connections to tpo

Sorry, jumped the gun. See below You need to leave the jumpers in place. You must move all negative battery connections to the “charge and load” side of the shunt. Then you connect the battery side of the shunt to the negative of one battery. You need to get a lead made for that, and it is advisa…

Wire them like this. If what you call jumpers are the wires between batteries, a better term is interconnects. [IMG_20241207_232523]

Thank you! This is how I was planning to do it, but didn’t know the ramifications, if any, of the interconnects. And thank you, interconnects is indeed what I miscalled “jumper”.

Thank you. If I understand correctly, this is in effect what PWFarnell illustrated for me as well. My concern was how the interconnects would be seen by the system, if at all. I will connect positive of bat 1 to + loads and chargers, neg from bat 2 to batt only side of shunt, and - loads and ch…

[20241207_213329] (Sorry for the poor illustration. From me, that’s as good as it gets.) A small, but potentially significant, modification to parallel battery block cabling. The use of terminal bus bars (TBB) permits electrically identical connections to each block, promoting true parallelism. …

Completely agree, the perfect solution with two batteries is with 2TBBs and 2 pairs of identical connectors to the batteries. I am also in the process of connecting a Victron battery monitor and am going to shift to the 2 TBB solution.

For 2 batteries I would dispute it being a significant benefit, as long as the interconnects are sized properly, the opposite corner wiring method gives equal resistances to both batteries. Once your are at 3 or more batteries, the bus bar has benefits. For 2 batteries it has the downside of more cr…

Connecting BMV 712 Battery monitor to a 2 x 12V parallel battery bank

DIY

JohnC 23 September 2024 13:19 2

Yes, move them to the same point. Even the low resistance of paralleling wires can have an effect on battery balance. Do it properly…

Topic		Replies	Views
Smart shunt DIY marine , beginner , parallel , smartshunt	3	186	22 March 2025
Another simple 12v system question DIY beginner , rv , parallel	6	287	22 December 2024
Max length for wires on BMV-712 Smart battery monitor DIY parallel , multiplus-ii	3	144	25 April 2025
Help with smart shunt connection Q&A and troubleshooting beginner , parallel , smartshunt	5	141	6 November 2025
Bmv-712 shows wrong current DIY diy , parallel , bmv , victron_community	11	218	12 September 2025

Connecting BMV 712 Battery monitor to a 2 x 12V parallel battery bank

Related topics