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BMS12/200 in old vehicle do I need a DC-DC charger for the starter battery?

I`m building a Camper van on the basis of an 1991 4x4 Van.

90Ah LiFePo Battery

180Wp Solar

30A Alternator


No land power connection (fully autark setup with very low power consuption)

Is the set up as shown in the picture correct?

Is the power from the solar charger suited to charge the starter battery or do I need a DC-DC charger?

The BMS12/200 fully protects the LiFePo Battery from any harm as well as the starter battery from discharge, is that correct?

many thanks for your expertice!!setup.png

dc system
setup.png (286.6 KiB)
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