Gus,
With a Perko switch, everything including the starter/alternator, helm buss and all stereo electronics are connected to the Perko common post. So, everything shuts down when in the 'off' position. The only exceptions might be a bilge pump/float switch and stereo memory if those are important issues for your storage scenario. There is no other way. This avoids multiple problems.
The reasons for a dual-bank multi-stage charger include but are not limited to:
- To keep battery(s) maintained during long storage periods where lead-acid batteries may self-discharge 3 to 4 percent a month.
- Totally recharge/condition/desulphate battery(s) after long periods at rest while playing your stereo since the alternator is unlikely to accomplish this in a reasonable time frame and particularly if you have a large audio system.
- Extend your playtime each following weekend and prolong your battery's lifespan over multiple seasons.
David
Earmark Marine