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Let me try asking this another way. What is it about "cruising" shore power battery chargers that allows them to smart-charge battery banks but also supply additional amperage to run DC appliances connected to the house battery distribution panel? What circuitry do they have that cheaper chargers do not?
The charger I got (aimed at trolling boat market) apparently does not have that capability, and merely floats the batteries with minimal amperage once the initial charging stage is done. When I flip on more than a couple of incandescent lights, the charger switches back to a higher charging mode from float, and flips back when I turn off all but one light.
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