question

bernsh avatar image
bernsh asked

Blue Smart 12/30 (3) different settings per output

Hi!
Basically the same question as

Blue Smart IP22 charger - multiple output to different battery types (EFB+ & AGM) by robot75

https://community.victronenergy.com/questions/88292/blue-smart-ip22-charger-multiple-output-to-differe.html

but:

I want to charge EFB+, AGM and Lifepo4 at the same time in my camper van.


thx in advance,

best regards, bernsh

bluesmart ip22
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3 Answers
anthony avatar image
anthony answered ·

You can charge three different batteries of the same chemistry. You cannot individually tailor each output to a specific battery chemistry. Anthony

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Mike Dorsett avatar image
Mike Dorsett answered ·

Mostly, it depends on the Absorption voltage for each battery. If you want to charge three different chemistries, then you need to use the lowest Absorption voltage, and face the fact that the higher voltage batteries won't get fully charged.

5 comments
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ultrazak avatar image ultrazak commented ·

Do I understand correctly that the recommended absorption voltages for EFB are 14.8 V, for AGM 14.5-14.8 V, and for LiFePO4 13.3-13.4 V? And accordingly, the lowest LiFePo and the total absorption voltage should be set to 13.4V?

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ ultrazak commented ·

The default Victron lithium charging algorithm has 14,2V absorption voltage.

It's one charger with multiple outputs not multiple chargers in one case.

All outputs are internally parallel but also isolated so that no current can flow between the batteries. The batteries need a common ground connection.

Charging multiple batteries with different chemistry is not recommended because you only can charge one of them with the correct voltage, for the others the voltage will be to high or to low.

@ultrazak I deleted you other comments. Digging out multiple old questions about a similar topic is not appreciated.

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regman54 avatar image
regman54 answered ·

Also, in addition to what has been said, take note of what each of YOUR battery manufacturer recommends for each of their particular battery's charge profile. Some AGMs for example like I have require a slightly higher charge profile than what generic AGM charge profiles are.

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