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ericbjr1 asked

Lifepo4 house bank and AGM starter with 12/3000 multiplus

I have created 2-12.8v 300 ah LiFePo4 batteries to be wired in parallel to the Multiplus on my sailboat. I have an AGM starter battery. If I setup the charging for my LiFePo4, the float is higher than I want for the starter battery. (14.3 absorption and 13.6 float). I would like to charge the starter battery with the Multiplus. What voltages does the Multiplus use on the trickle charge output? Is it even possible to properly maintain an AGM starter battery, when the charging profile is setup for LiFePo4?

battery chargingLithium Batterystarter battery
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Justin Cook answered ·

Hi @ericbjr1, the Multi will trickle charge at ~4A and a slightly lower output voltage (so expect @13.0-13.4v) for the exact purpose of maintaining your starter battery; this voltage (particularly at the very low current) will be appropriate for 98% of all Pb batteries, including your AGM.

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