Will the Victron Orion XS 12/12-50A DC-DC drain my starter battery?

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kodax asked Mar 9, '24

Will the Victron Orion XS 12/12-50A DC-DC drain my starter battery?

I have a sailboat with a AGM starter battery and Lithium house batteries.

My planned setup was to have my two engine dynamoes (old Valeo 60A, not "smart") and Victron MPPT solar charger connected to my starter battery, and a Victron Orion XS 12/12-50A DC-DC to charge my lithium batteries when the voltage on the starter battery is above 14V.

But will this maybe drain my battery when the input current from dynamo/MPPT is below 50A? Or will maybe the DC-DC make the starter voltage soon drop below 14V, turn itself off, starter voltage will then go below 14V, DC-dc will restart, sdtarter voltage will drop etc etc.?
Or is there maybe some smart functionality, making the DC-DC not pull anymore ampere than what my BMV712 measures comming in?

orion dc-dc dc-dc charger orion xs orion smart

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Answer 1 · 2024-03-09T11:44:24Z

kodax answered · Mar 09 at 11:44 AM

I guess this is where the magic happens:
"3. 2 → 3: If VIN ≤ Vshutdown, the charge current will be reduced to prevent VIN to drop below Vshutdown. Manual - Orion XS 12/12-50A DC-DC battery charger Page 12 Operation, configuration and monitoring"

So all good, not so dumb this smart charger :)

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