Quote Originally Posted by Wylietunes View Post
This is due to the fact that alternators make for poor battery chargers. They are not designed or intended to recharge a dead battery. Not saying they wont, given enough time, saying its not what they are intended to.
I never run them completely dead. Only to the point of "distortion" due to what I assume is low power then run the boat. But once I get to that point it could take hours to re-charge.

[/QUOTE]What brings you to this conclusion?[/QUOTE]

This is my assumption based on not being able to bring the batteries up to charge while driving and running the stereo. Now I have not actually started with a full charge and run the boat to the point of distortion. But based on math, mine does not seem enough. Assuming 100% efficiency, I need at least 90A (assuming 14.4v) continuous just to run the stereo amps (MHD900/5 and M600/6 and will add another M600/6 and bridge all channels (which will add another 50A) at full RMS power. I know RMS is not actually continuous in the truest definition cause music fluctuates, but this is what I have to go with for my assumptions.

I do shore charge the boat as I have a built in charger. I run 2 AGMs dedicated to the stereo and one for the rest of the boat.

I know you are an audio guy so maybe you have alternate experiences and recommendations?

All: I do shore charge the boat as I have a built in charger. I run 2 AGMs dedicated to the stereo and one for the rest of the boat.