B2b Via Cbe Setup

[Tombola]

Ive held off adding my Victron ISolated b2b to my lithiums as A I was getting + 40 amps from my alternator, but seeing I have dismatled my setup due to another issue I am going to stick it in,
Question I have is the pic shows the fused power from the alternator that charges the battery now, and Im thinking I can just add my b2b after this fuse.

What do I do about my negative ? just run one back to the cab battery as I have done on other vans or woudl I need to involve the CBE unit somewhere.
And if I do, then am I better off doing it as a complete new circuit and bypassing the CBE all together.

 

[the1andonly]

Have you got a cb300?
Many threads here concerning cutting r37.
I have successfully added a votronic b2b near to the cbe using all the cbe terminals for b1+ b2+ and b1- also the D+ signal.also wiring diagrams.

 

[Tombola]

Thanks, Ill take a look at them.
I have installed a few b2bs going back as a complete seperate circuits, and am not familiar with the CBE system so will take a look at the threads
Thanks

 

[Steve and Denise]

What cbe is it DS?

 

[Tombola]

What cbe is it DS?

yep, DS300

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[Steve and Denise]

Mine was a 470 so probably different or I could have helped

 

[the1andonly]

Naked version so you can see the battery terminals.
Followed by location of R37 and cut version.
R37 (a zero ohm jumper) is cut to disable the split charge relay.
D+ Taken from conector

 

[Pausim]

You only need to cut the resistor (or make other arrangements to disable the split charge relay in the DS300) if you are wiring the B2B directly to the battery. If you use the existing wiring to send the B2B power through the DS300 then the relay still needs to be operational. What is the power output of your B2B? If the B2B output is within the CBE limits and the wiring is of sufficient size then using this might be more straight forward.

 

[Tombola]

You only need to cut the resistor (or make other arrangements to disable the split charge relay in the DS300) if you are wiring the B2B directly to the battery. If you use the existing wiring to send the B2B power through the DS300 then the relay still needs to be operational. What is the power output of your B2B? If the B2B output is within the CBE limits and the wiring is of sufficient size then using this might be more straight forward.

Thanks.
The b2b is victron 30a..and ATM I'm getting 40 plus amps via it now through 16mm. But just want the b2b to control the charge.

 

[Pausim]

Thanks.
The b2b is victron 30a..and ATM I'm getting 40 plus amps via it now through 16mm. But just want the b2b to control the charge.

30A should be ok through the DS300 relay.

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[Steve and Denise]

The only problem is the B2B if fitted in the line only connects while running, so no feed back through it for hab supply, that’s why I used a n/c relay to to feed the electrics when the engine is not running.
hope that makes sense

 

[Pausim]

The only problem is the B2B if fitted in the line only connects while running, so no feed back through it for hab supply, that’s why I used a n/c relay to to feed the electrics when the engine is not running.
hope that makes sense

Good point. My dealer connected the B2B directly to the battery when he moved it from my previous motorhome. I added a n/c relay to overcome the loop problem. I didn’t want to cut the resistor in case I wanted to reverse the changes.

 

[the1andonly]

Cutting the resistor doesn't stop you reversing the changes just add a jumper wire or even a switch.
The difficulty is access, in my case a bit nay a lot of dismantling is required

 

[Pausim]

Cutting the resistor doesn't stop you reversing the changes just add a jumper wire or even a switch.
The difficulty is access, in my case a bit nay a lot of dismantling is required

At the time I didn’t realise it was a 0 ohm resistor.