Dc to dc charger wiring ?

[seanoo]

Hi , I decided to shelve the lithium battery idea for now and just bought 3 new lead acid batteries, cheap and cheerful. I have also bought a 12/12/30 amp victron Orion tr smart dc to dc charger to get maximum charge into them while driving.
1st question is , is it a case of running a positive and a negative from my starter battery to the input on the charger and then the same from the output to the leisure batteries?
2nd question is where on my 3 leisure batteries do I connect? Do I connect to the positive and negative on the closest battery or the positive on the closest battery and the negative on the furthest ? Thanks for any help and any other info that might be helpful

 

[pappajohn]

The B2B will have a wiring diagram.
If you can find the existing split charge relay you can connect it there.

 

[pappajohn]

Current thread on B2B

https://www.motorhomefun.co.uk/forum/threads/the-b2b-question.231128/#post-4206480

 

[Lenny HB]

2nd question is where on my 3 leisure batteries do I connect? Do I connect to the positive and negative on the closest battery or the positive on the closest battery and the negative on the furthest ? Thanks for any help and any other info that might be helpful

That is the correct way to do it you should also connect to your hab circuit the same way.
A 30 amp B2B is a bit small for a 3 battery bank.

 

[seanoo]

That is the correct way to do it you should also connect to your hab circuit the same way.
A 30 amp B2B is a bit small for a 3 battery bank.

Cheers Lenny , can I fit a second dc to dc the same as the one I bought and get 60 amps ?

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[Lenny HB]

Cheers Lenny , can I fit a second dc to dc the same as the one I bought and get 60 amps ?

Not sure you would need to ask Votronic.

 

[Pausim]

Cheers Lenny , can I fit a second dc to dc the same as the one I bought and get 60 amps ?

I found this on the Victron site.
“The Orion Tr-Smart charger can be used in 12V or 24V systems and is suitable for both lead acid and lithium batteries. Models are available up to 400W and unlimited multiple units can be connected in parallel to increase output power.”

There are isolated and non isolated models, you had better check the exact details for the model you have bought.

 

[bigtwin]

Current thread on B2B

https://www.motorhomefun.co.uk/forum/threads/the-b2b-question.231128/#post-4206480

Boom boom!

Ian

 

[autorouter]

positive on the closest battery and the negative on the furthest ?

Of those two choices that one is better. Also the main load positive and negative should be connected like that too.

The idea of this is to make voltage drop ie the wire length to each battery equal. A better method for three batteries is to put an isolator switch and/or a fuse in the positive wire near the battery. Then run three equal length wires from the switch/fuse to each battery positive.

On the negative side, if you are wiring in a shunt for a battery monitor, you could run three equal wires from the shunt to each battery negative. If not, you could put in a busbar or a distribution post.

 

[seanoo]

I found this on the Victron site.
“The Orion Tr-Smart charger can be used in 12V or 24V systems and is suitable for both lead acid and lithium batteries. Models are available up to 400W and unlimited multiple units can be connected in parallel to increase output power.”

There are isolated and non isolated models, you had better check the exact details for the model you have bought.

Thanks for the info . Looked on the box and mine is isolated , is that good lol ?

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[Pausim]

Isolated is needed if the two systems do not share a grounded negative whereas the non-isolated has a common negative. In practice with the isolated you need to connect a negative connection to both of the negative connections on the unit but it doesn’t seem to matter that they join up to a common earth.