Victron - Argofet 100-3 Three batteries 100A [ARG100301020] Blue Power Chargers Diode Battery Combiners are used

Diode Battery Combiners are used to guarantee continuous DC power to mission critical equipment

Blue Smart IP65 Charger 12/10

for example the Cerbo GX or Ekrano GX

Argofet isolators have virtually no voltage loss

The MultiPlus

Victron - Argofet 100-3 Three batteries 100A [ARG100301020] Blue Power Chargers Diode Battery Combiners are usedSimilarly to Argodiode battery isolators, Argofet isolators allow simultaneous charging of two or more batteries from one alternator (or a single output battery charger), without connecting the batteries together. In contrast with Argodiode battery isolators, Argofet isolators have virtually no voltage loss. Voltage drop is less than 0,02 Volt at low current and averages 0,1 Volt at higher currents.