Finally got my system together and working

[Johndobbs]

I have two 12 volt 100 amp batteries wired to double the amperage.
I really definitely like the victron smartshunt easy to wire up easy to program and easy to use.
Not quite done still have to build a wooden box to make it easier when I move between commercial vehicles as well as mounting stuff to but it's mostly done and operational.
That paper behind the shunt make sure it does not touch the positive terminal behind it.
There's also a strap across the bottom of the batteries so they don't pull apart.

 

[TEV]

I have two 12 volt 100 amp batteries wired to double the amperage.
I really definitely like the victron smartshunt easy to wire up easy to program and easy to use.
Not quite done still have to build a wooden box to make it easier when I move between commercial vehicles as well as mounting stuff to but it's mostly done and operational.
That paper behind the shunt make sure it does not touch the positive terminal behind it.
There's also a strap across the bottom of the batteries so they don't pull apart.
View attachment 82636View attachment 82637View attachment 82635

What is the purpose of the system?
You may want to use a better insulator than paper.
You could use double adhesive tape to secure the shunt( https://www.amazon.com/Double-Mounting-Waterproof-Outdoor-Black，1/dp/B08SQYHC2P ) , or if you want it removable, velcro (https://www.amazon.com/Denser-Sticky-Adhesive-Fastener-Strips/dp/B07N3B36Z2)

 

[rmaddy]

Why is there no main battery fuse? There must be a proper battery fuse between the battery positive and your main cutoff switch.

 

[jpmtz]

Why is there no main battery fuse? There must be a proper battery fuse between the battery positive and your main cutoff switch.

Good call! This is why I joined this forum. Thanks, RMaddy

 

[jaytee]

Why is there no main battery fuse? There must be a proper battery fuse between the battery positive and your main cutoff switch.

What's the rule of thumb on when to use fuses? My rv has many fuses already but if adding a cutoff switch like OP did, you have to add another fuse for the positive to the cutoff?

 

[rmaddy]

What's the rule of thumb on when to use fuses? My rv has many fuses already but if adding a cutoff switch like OP did, you have to add another fuse for the positive to the cutoff?

There needs to be a main battery fuse at the battery whether there's a switch or not. This is especially true with LiFePO₄ due to their low internal resistance than can result in a huge current surge if things go bad.

Fuses protect wires. Each current path needs a fuse so the wire doesn't become dangerous if a problem causes too much current to be sent down the wire.

 

[Johndobbs]

What is the purpose of the system?
You may want to use a better insulator than paper.
You could use double adhesive tape to secure the shunt( https://www.amazon.com/Double-Mounting-Waterproof-Outdoor-Black，1/dp/B08SQYHC2P ) , or if you want it removable, velcro (https://www.amazon.com/Denser-Sticky-Adhesive-Fastener-Strips/dp/B07N3B36Z2)

The paper is temporary the bottom of the shunt isn't flat I'll be gluing a price of plastic under it for more surface area for the double sided tape

 

[Johndobbs]

There needs to be a main battery fuse at the battery whether there's a switch or not. This is especially true with LiFePO₄ due to their low internal resistance than can result in a huge current surge if things go bad.

Fuses protect wires. Each current path needs a fuse so the wire doesn't become dangerous if a problem causes too much current to be sent down the wire.

Yes that was a rookie move I had a fuse so I installed it today.
Thank you

 

[Johndobbs]

There needs to be a main battery fuse at the battery whether there's a switch or not. This is especially true with LiFePO₄ due to their low internal resistance than can result in a huge current surge if things go bad.

Fuses protect wires. Each current path needs a fuse so the wire doesn't become dangerous if a problem causes too much current to be sent down the wire.

Got a main fuse installed today that was a rookie move on my part WOW.
Thank you

 

[Johndobbs]

Why is there no main battery fuse? There must be a proper battery fuse between the battery positive and your main cutoff switch.

Got one installed today.
Thank you

 

[Johndobbs]

What is the purpose of the system?
You may want to use a better insulator than paper.
You could use double adhesive tape to secure the shunt( https://www.amazon.com/Double-Mounting-Waterproof-Outdoor-Black，1/dp/B08SQYHC2P ) , or if you want it removable, velcro (https://www.amazon.com/Denser-Sticky-Adhesive-Fastener-Strips/dp/B07N3B36Z2)

This system powers my cooler and CPAP machine when the commercial vehicle is not running then the inverter (powering the Lifepo4 charger) in the truck charges the Batterys while I drive.