Hello, I want to update the house batteries on a sailboat to LiFeP04. I prefer to keep the alternator as is. I need help sorting out if I need a second charger (Installation 1 in the image). Will the DC-DC work with the AGM charger and the starter battery, or will the DC-DC be often triggered while the starter AGM is maintained (Installation 2 in the image)? I included two ideas for the installation, just the concepts, no fuses, bilge, etc, shown to clarify the challenge faced. The boat is on shore power during the week, with a dehumidifier and refrigeration running.
