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No. Two sets of two batteries each are separate.
There are two scenarios here, lets separate them.
Usually I only go out on the boat on a Friday or Saturday. The engine requires 11.84 volts to start. Then an unknown draw to continue to run. By the end of the day, when I am ready to go back the engine will not have enough juice to start. The batteries have around 10 volts in them at that point. I need to have a solar panel to charge them back up to 11.84.
The stereo is a whole different matter. I run those batteries dead within a day. I want to be able to walk down to the boat and set them to charge using the solar panels on say Sunday (the whole day while I am not using the boat).
So the engine starting batteries need to be charged up to 11.84 the same day I am on the boat (while I am on the boat).
The stereo could be charged any other time (when I am not on the boat... Docked).
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