Before heading to the Sea of Cortez I installed a 48V LFP bank, dual inverters, along with 3 Orion Tr converters. I want to say all this is working very well and I couldn’t be more pleased. All 12V operations function well except my davit operation. With the old lead-acid batteries I ran the davit off a 15amp breaker. Now the 48V bank feed a common bus which supplies power to the 3 Orion converters, each with a 25amp breaker, feeding a 12V bus bar. The davit comes off the 12V bus bar with an 80amp breaker. The davit will not run without tripping its 80amp breaker. It has 6ga wire running the 25ft to the davit. Why does this not work? Thanks.
What’s the rating on the davit winch motor? It should be on a label on the side of it - or the make/model might provide some insight.
Is there a solenoid/contactor that connects to the motor to control it’s direction? What’s that rated for.
eg 12V and what’s the operating current and stall current? I suspect the start up or stall current is too high. I had a problem with a winch that needed over 100A to get it going when loaded. Your original 15A breaker was perhaps tolerant of the startup current.