Lithium low charge rate on alternator/B2B

[newtonz]

I've searched for a while but not found answer, so one of the pros on here will probably be much quicker.
Rapido Fiat Ducato 2011, traditional alternator, Victron 12:12:30 B2B, Fogstar Drift 230Ah. But only charges at about 12A when driving, even when e.g. 50 or 60 %SOC. B2B is set to Li and trad alternator. Are there any other settings I can tweak, or is this normal?

 

[MichaelT]

Does it also run your fridge as that will take about 15a. Also the 30a ones are notorious throttling back due to getting hot so is there enough air circulation around the B2B?

 

[TheCaller]

Was the original split charge system disconnected when the B2B was fitted? It should have been, otherwise it creates a loop that stops the B2B working at full capacity. This does sometimes get overlooked.

 

[LithiumConvert]

But only charges at about 12A when driving, ........., or is this normal?

Yes - see next point.

Does it also run your fridge as that will take about 15a.

Problem solved.

Try turning the fridge off. You should get much nearer to 30 amp.

 

[bigtwin]

As others have said, your fridge is consuming around half the output.

Ian

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[newtonz]

Thanks, guys, you're right. I've been static on hookup in Spain for a few days, so not had a chance to test it. Yes, the current to Li battery drops when engine running and fridge is turned to battery. I'm slightly surprised, as I have the extra NC relay to to open and disable the split charging that the internal relay in the control panel would originally have connected both batteries when engine is on. And I thought that the fridge supply was on the alternator/cab battery side of that - unless maybe that is 'starving' the supply from alternator into the Victron B2B.
Obviously, a bit more research needed.