Rapido b2b (1 Viewer)

Sep 30, 2022
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Rapido V68
I have just installed victron shunt and Mppt controller on my Rapido v68. Noticed that I was m getting 5amp only through alternator, which seems a little low. Considering putting a Victron b2b and wondered what the wiring diagram look like?

I think I will need 30amp and fused either side of the b2b with 16mm cable. Reading up they seem to dissipate a lot of heat so need to think about position. Thinking negative to go on shunt positive to go straight onto positive side of parallel 200ah battery (2 100ah agm). However can I still leave existing alternator connection into ECU.

Thoughts and thanks

Mike
 
Apr 27, 2016
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It depends on the details of your existing setup, but inevitably something will need to be done to disable the existing path through the distribution box, which I'm sure will have the split charge relay built in. You will need a D+ signal to switch the B2B on and off when the engine starts and stops, but that should be easily available at your distribution box. What make/model is the distribution/fusebox?

The B2B has a starter battery/alternator input positive, a leisure battery output positive, and a common negative, also a control input for the alternator D+ signal.
 

ManTheVan

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Check this thread out - it was a great help when I converted to Li and fitted a B2B in my Rapido. Pausim is your man.

 

Hoovie

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May 16, 2021
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It depends on the details of your existing setup, but inevitably something will need to be done to disable the existing path through the distribution box, which I'm sure will have the split charge relay built in. You will need a D+ signal to switch the B2B on and off when the engine starts and stops, but that should be easily available at your distribution box. What make/model is the distribution/fusebox?

The B2B has a starter battery/alternator input positive, a leisure battery output positive, and a common negative, also a control input for the alternator D+ signal.
Victron unit uses voltage sensing to activate. no D+ required (quite a few are like that. My Ablemail AMC60 doesn't have a D+ going to it, for example)
 
OP
OP
BOOMEL
Sep 30, 2022
184
145
Funster No
91,610
MH
Rapido V68
Check this thread out - it was a great help when I converted to Li and fitted a B2B in my Rapido. Pausim is your man.

Any chance of photo / diagram of what yours looks like?

Regards

Mike

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ManTheVan

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Jan 11, 2020
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Really sorry, no. Am away at present so can't get a photo (not that it would be much use anyway, as everything is clipped neatly away!) Pausim's circuit diagram is very clear though, and the link to the Durite relay is good. The NC relay is essential, as it prevents a feedback loop (all explained in the thread). You'd need to run dedicated cables from the engine battery to the Li and then fit the NC relay into the mix, using the D+ feed to tell the relay when the ignition is on, so it opens.
 

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