Batteries and Charging Systems

[GLF]

I have a bad alternator for one of my engines, and am getting ready to replace it. I started doing research on batteries and charging systems. The web is full of useful information. Has anyone heard of a "Centerfielder (http://balmar.net/page21-centerfielder.html)" module?

Here is a good read about alternators (http://balmar.net/PDF/Alternator%20Manual.pdf).

I have a couple of questions for all of the members.

1. How many batteries do you have in your boat?
2. How many amps is your alternator?
3. If an alternator does not charge until 1,200rpms, have you changed the pulley on your alternator so it will charge at a slower RPM?

[Priority1]

1. One battery
2. 63 A.
3. No

[DangerDan]

I run a single engine w/three batts. I have a 94amp alternator w/modified pulley to give a higher charge at a lower RPM. (Check alt. RPM max before modifications.)

I use one of these:
http://www.bepmarine.com/Single-Engine%2C-Two-Battery-Banks-180-1463.html

I'd recomend this one for you.
http://www.bepmarine.com/Twin-Outboards%2C-Three-Battery-Banks-180-1465.html

or you can use this one.
http://www.bepmarine.com/Twin-Inboards%2C-Three-Battery-banks-180-1466.html

I recomend this system for two reasons. It's self actuated and basically does it's own thinking and you won't accidently kill an alternator by shutting off a switch. The second reason, I've had mine almost 4 years and it's never failed me. I run many extras including an inverter and have never had a dead battery. It works, that simple.

I'd also recomend having you batts tested prior to any work.