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Author Topic:   Second Battery
msarafin posted 11-25-2005 07:05 PM ET (US)   Profile for msarafin  
Is it best to have a starting [battery] and a separate [battery] for electronics? I plan on having a fairly basic stereo, a GPS/plotter combo, nav lights, radio, and cigarette lighter outlet onboard. Can all of this run from one [battery]? Is it a safer bet to have [two batteries] with a switch capable switch of paralleling?
Chuck Tribolet posted 11-25-2005 07:14 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
What boat? Real question is how iss the space situation?
What motor? Real question is pull-startable motor?

I have all that except the stereo on my Montauk, and run it
with one battery. Space is at a premium.


msarafin posted 11-25-2005 07:25 PM ET (US)     Profile for msarafin    
Sorry. I have a 1981 Montauk 17 with an 80-HP Mercury. I am not sure of the model year of the motor. It is not pull-startable. As far as space, I can make it. I'm planning on fabricating rear seats for either side of the motor, and will stow the batteries underneath.

I imagine that the old saying "Two are better than one" probably applies.

jimh posted 11-26-2005 08:52 AM ET (US)     Profile for jimh  Send Email to jimh     
[Re-wrote portions to remove unusual abbreviations. Please do not invent abbreviations. Use of made-up abbreviations is very strongly discouraged.]
jimh posted 11-26-2005 08:59 AM ET (US)     Profile for jimh  Send Email to jimh     
It is an extremely common practice to have two batteries on boats where the outboard motor cannot be pull started. Generally a boat whose motor is so large that it cannot be pull started is also a boat which is rather difficult to propel with oars. Most people rely on their motor for propulsion, and having a second battery for engine starting is considered a good idea.

On a small outboard powered boat it is generally not the custom to isolate electronic devices from the starting battery circuitry and to provide them with their own battery. Generally the boat's electronics will be powered from the same source as the engine. That is not to say that having an isolated house battery is not a good idea, but this complexity is not that common on small boats. It is very common on larger boats with more complex electrical systems and whose electronic instrumentation is more sophisticated (and expensive).

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