question

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DVCC to limit total charge current?

I have a parallel multiplus system, with a BMV712, and CERBO GX connected to a FLA battery bank on my boat.

I am interested in limiting charge current when the engine alternator is producing as well as the generator as to not exceed the charge current acceptance rate of my batteries.

A method that we have discussed is using a AUX input on the master multiplus to trigger a reduction in the output capability of the multiplus units. This aux contact would be tied to a “main engine running” signal.

I am certain that this method would work, but there might be a better way.


Could I turn on DVCC on the CERBO GX and have it limit the charge current by using the value supplied by the BMV712?

That would be the best method in that it would be dynamic.


Please let me know.


Thanks!!!




DVCC
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blskevin answered ·

I will answer my own question because I tried it on my own live system.

While the CERBO might be aware of the charge current the batteries are receiving through the BMV it does not take this into account when using DVCC.

This means that alternative sources of charge current, for example a engine alternator, or non GX solar, or any other charge source is not included in the charge current calculation for DVCC.

For my installation I’m using assistant to limit AC input which in effect limits charge current. This assistant triggers on aux input 1 which is closed by a relay on my main engines run circuit. This limits charging of the multi’s when the engine alternator is running.

This is not the optimum solution, as I would greatly prefer a DVCC that is BMV aware, but it works.

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