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I have an AirMarine X, it is definitely NOT quiet. For batteries I use AGM because the locations are too difficult to get to for regular service. In my experience on my prior boat - golf cart batteries worked just fine.
I don't have solar so I can't help you there. On my boat the house bank is isolated from the engine bank under normal conditions although I have provisions for cross connecting them into one large bank.
Hope this helps a bit.
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