shunt location lithium upgrade

[WinniMN]

Greetings,

I’m sorry my first post is a question.

I have replaced the original Napa flooded deep cycle batteries with LifeBlue Ultimus LiFePO4. I maintained the original wiring configuration. They are working good and charge from all sources.

The goal was to get 2 days of power for the refrigerator without charging from a source other than solar.

My question is, in the process of installing a Victron 712, where do I place the shunt in the wiring? I read the instructions and understand it mounts in the ground between the battery and the loads, but i am not sure where the jumper goes that connects the 2 batteries.

this pic is the installation with the new batteries preserving the original cable routing.



This is the original diagram.



This is option 1 which is where I think the shunt goes.



This is option 2 which is where Victron thinks it goes.



If there is someone who would be able to advise which option I should chose I would appreciate it.

Also:
After staring at my setup, I am not sure that it was wired correctly in the first place.
I found this member’s video and took a screen shot of his cabling. It looks like this:



Here is a diagram of what I am wondering if this is what mine should be, option3.



I am making an assumption on the cables exiting to the right. I assume a ground and power go to the Chargemate Pro under the seat and the other ground is the chassis ground. It is a lighter weight cable. Is this a correct assumption?

I am installing the Victron to have an “at a glance” SOC without having to open the app.

Thank you for any help you can provide.

Bruce

[creativepart]

I’ll post a bit more on this tomorrow when I can study your diagrams a bit more, but I think you are missing a key point. All negative loads go to the load side of the shunt. And then one negative from the battery side of the shunt goes to the first neg on the first battery in your parallel battery bank. You want the shunt to intercept all loads on their way to the battery bank.

By all loads I mean the inverter neg, the chassis neg, any solar controller neg. Those all combine on the load side of the shunt. Then the shunt connects to negative side of one battery. That same neg battery terminal is then connected to the other battery’s neg terminal making the negative side of the parallel connection.

You can stack all the load negs on one lug of the shunt but many find it more convenient to use a negative buss bar.

I went that route and here’s a photo where I labeled everything. It might help clear up the concept of all negative load on the load side of the shunt. Also I’ll attach a diagram that explains the battery wiring with the shunt.

Hope this helps.

[WinniMN]

Originally Posted by creativepart

I’ll post a bit more on this tomorrow when I can study your diagrams a bit more, but I think you are missing a key point. All negative loads go to the load side of the shunt. And then one negative from the battery side of the shunt goes to the first neg on the first battery in your parallel battery bank. You want the shunt to intercept all loads on their way to the battery bank.

By all loads I mean the inverter neg, the chassis neg, any solar controller neg. Those all combine on the load side of the shunt. Then the shunt connects to negative side of one battery. That same neg battery terminal is then connected to the other battery’s neg terminal making the negative side of the parallel connection.

You can stack all the load negs on one lug of the shunt but many find it more convenient to use a negative buss bar.

I went that route and here’s a photo where I labeled everything. It might help clear up the concept of all negative load on the load side of the shunt. Also I’ll attach a diagram that explains the battery wiring with the shunt.

Hope this helps.

Thank you, that answers what i was questioning.

Bruce