Hey All, It's that time for me. I need to replace my house batteries (2 - 8D wet batteries) I am going to replace with AGM.
I don't care about all the calculations of recharge costs, etc. I'm going with AGM. I don't want any more holes in my favorite pair of holy-shorts.
My only question is, I have a happy little seavolt group 24 (? i think) wet cell starter battery. Everything I read says don't mix them. They are different banks and don't get cross connected at all, but they get charged from the same alternator. Do I need to change my starter battery too?
I will have a deep cycle wet for my windlass, a wet cell starter battery for my engine, and three 8D AGMs for the house batteries. I will charge them separately via isolators and switches. Basically, I will charge the starter from the alternator, and then switch that output to the windlass. The house banks will take charge from solar and wind, and if needed, a genset. They will also take a charge from shore power, of course. The inverter/charger can be modified easily to switch to different charging cycles, should this be necessary. I anticipate I will charge the windlass battery from the generator: its use is the most sporadic and brief. Alternatively, I can "trickle" it full using a small solar panel on the foredeck.
This seems more expensive and complex than it will actually be, but it plays to the strengths of each battery type and its designated role on my boat, and it gets the batteries away from the engine and its heat.