Combine MPTT+DC/DC+grid to charge battery on boat

DIY
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1

Hi,
My current boat household batteries are currently being charged bij my MultiPlus when on shore supply, and I noticed my solar does not contribute to the charge anymore.
Furthermore I am going to add a DC/DC charger to load them with my alternator when underway on engine. It’s difficult to find what I need to change to prioritize solar.

Setup: 3x200Ah LiFePo and Orion 12/12 30 BT (to be installed), MPTT 100/30 smart (VEdirect to Cerbo GX) and MultiPlus 3000 (VEdirect) and smartshunt (VEdirect). Monitored by Cerbo GX.

Any tips as to setting it up the right way?

2

In the past I have set the absorption and float voltages 0.1V higher in the MPPT than the Multiplus. This means when the solar has more than enough power it covers the DC system, bit if not the Multiplus makes up the balance. Set the DC to DC voltages lower than the solar so solar has priority over engine.

3

That makes sense, thanks for the answer! I will try that when I install the LiFePo somewhere in the next weeks, have to change settings then anyway.