Hi 4ePajero
Ah, I see the misunderstanding. Completely agree with you, but the DC-DC charger as described by OllieNoster switches load to the alternator and in doing so isolates the aux battery from the alternator circuit. So appliances are powered by the alternator and the aux battery and battery charger are on a separate circuit.
Uys. The charger should not be running when the engine is off, so there shouldn't be a need to fit an isolating solenoid. Even the less well equipped DC-DC chargers have an on-off signal input, whatever signal you were planning to drive the solenoid can be used to switch the charger on directly. The only time this will be needed is if the charger doesn't switch load when the engine is running.
Edit: But even if it doesn't switch load, your main battery should still be fine, the aux is just charging slight less efficiently.
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