Help pick cheap subs for our pontoon boat...

[EricU]

Eric,
If your alternator size is adequate there is no reason for it not to service the stereo & stereo batteries until the desintation is reached and the engine is turned off. This might extend your playtime, reduce discharge levels and prolong the batteries lifespan. After depletion you would not re-introduce the alternator, in any case, to the stereo battery bank again within the context of that day. So on that basis the alternator/stator capacity is good info to have.

That was the idea with the motor's alternator and the gen set.

The motor's alternator is rated at 60 amps -- 756 watts (12.6V)

Planning on having a substantial shore charger?

I would like to run a ProMariner Prosport 20

If I can figure out how to wire it, I would also like to install a Blueseas ACR and switch as I really like the install on the Moomba

Did you plan on using the above mentioned Gen on the boat as standard equipment? If so, will the charger be asked to function as a power supply/convertor?

We bought the gen set specifically for the camping and were planning on permanently mounting it or another on the pontoon boat.

What kind of play time at rest are you expecting?

All day in the cove. The pontoon boat is used as a home base for the Moomba, too many kids!

Will definately run class D amps.

Will the volume be kept at a level that is safe for children and will it be louder on occasion with adults only?

Pretty normal levels - whatever that is - levels, where you can talk. Of course every now and then the kids will hear some song and want it "turned up"