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off topic--2 batteries, one alternator

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davidbf(at)centurytel.net
Guest

Posted: Mon May 21, 2007 7:44 pm Post subject: off topic--2 batteries, one alternator

I have a boat I am wanting to hook up a second battery for running on-board

equipment and charge from the same 25 amp alternator of the motor.  Thinking

about paralleling the batteries with a diode separating the starting battery

through positive lead, isolating it from the load of the on board equipment. 

Should there be a concern of overcharging or more likely undercharging the

second battery?   See anything wrong with this simple system?

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nuckollsr(at)cox.net
Guest

Posted: Tue May 22, 2007 6:45 am Post subject: off topic--2 batteries, one alternator

At 11:43 PM 5/21/2007 -0400, you wrote:



 	  Quote: 	
		  



I have a boat I am wanting to hook up a second battery for running on-board

equipment and charge from the same 25 amp alternator of the motor.  Thinking

about paralleling the batteries with a diode separating the starting battery

through positive lead, isolating it from the load of the on board equipment.

Should there be a concern of overcharging or more likely undercharging the

second battery?   See anything wrong with this simple system?


	


   It can be simpler yet. Assuming you have useful instrumentation/

   warning systems aboard (most important . . . a low volts warning

   light) then you can simple hook both batteries on line during

   normal operations through a switch. See marine suppliers for

   OFF, 1, 2, BOTH battery switches.



   Distribute loads unique to each battery from battery busses

   that are not switched. During normal operations (engine running,

   low volts warning light out), the battery switch is at

   BOTH. If the light comes on, move the battery switch as-desired

   and keep on truck'n.



   See:



http://www.aeroelectric.com/Pictures/Switches/Battery_Switches/



   Bob . . .

        ----------------------------------------

        ( "Physics is like sex: sure, it may   )

        ( give some practical results, but     )

        ( that's not why we do it."            )

        (                                      )

        (                 Richard P. Feynman   )

        ----------------------------------------

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