Jay - I'm not sure your familiar with how we do it now.
The auto split charging system we use goes like this:
You have a battery isolator with a key and then 1 starting battery with as many aux batteries as you want.
When you turn your boat off, it isolates the starter battery automatically via solenoid. this battery is then not running anything other than the vital boat bits such as starter, nav lights, bilge, blower etc (it sits dormant while you party). your stereo equipment then runs off the aux battery(s). once you are done partying and ready to go home you turn your key and the starter battery clicks back into play to let you start the boat and the alternator starts charging everything back up.
The only problem you'd ever encounter is if you'd totally wasted your aux batterys (but stereo quipment would stop functioning at 10-11v's so this is unlikely) - when you turn the key, all batterys are joined again. this could put load on your starter battery and sap its juice. No prob though, you'd just flick the aux batteries off via the built in isolator and let the starting battery do its thing o its own. no need for any tools.
Job done for £25 quid. Far easier than a perko switch because with that you have to remember to switch it over whenever you stop the boat to chill out to some music.
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