ProMariner Install question

Place blame on ignorance, not the charger.

Corrosive environment? I do not see a lot of that happening with quality tinned terminals and clean tight connections. Besides, with more and more boats using AGM's, corrosive gasses becoming a none issue.
Your choice sir; I'm only explaining why the OEM is the way it is.
Tom
 
The chargers are there most efficient when the cable is sized appropriately for the cable run.....otherwise you will have voltage drop which is no big deal except the batteries will take longer to charge.

I had to upgrade my breakers and cable size from charger to the switches when I upgraded from the stock 40 charger to the Promariner 50 amp charger to mitigate voltage drop when on the hook using the generator.
I did a similar installation. My house bank are 2 large Trojan J185H unit’s that take a bit to charge. I upgraded to a 60 amp Promariner and upgraded all of the wiring and added inline 70 amp fuses.
 

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