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TOPIC: Adding Aux. battery

Adding Aux. battery 25 Jun 2009 21:08 #1

  • jwilse
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Hi all ,
I am thinking of adding a second battery . Would it be best to run the batteries in series or to just add a dual battery switch . Also any ideas or suggestions or dos and don'ts would be appreciated . I'm putting it in a 1987 bayliner trophy 2160.
Thanks ,
Jwilse

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Adding Aux. battery 26 Jun 2009 00:54 #2

  • Monterey10
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The battery pad Bay uses for the primary battery is large enough for 1 battery.

If you have a 4 cylinder in the boat, I've seen people bolt a piece of starboard down near the engine's starter. This serves as a solid mount for your second battery box.

I always recommend a battery switch. If you're running downriggers or crab pullers and flatten your "house" battery, your primary battery will start the boat.

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Craig Capitola Village, CA
1988 Bayliner 2556 (BoatAsaurus)
1996 Trophy 2352 (Mystic)

Adding Aux. battery 26 Jun 2009 01:58 #3

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jwilse;314756 wrote: Hi all ,
I am thinking of adding a second battery . Would it be best to run the batteries in series or to just add a dual battery switch . Also any ideas or suggestions or dos and don'ts would be appreciated . I'm putting it in a 1987 bayliner trophy 2160.
Thanks ,Jwilse

Two 12 volt batteries in series will create 24 volts..... you do not want to do that. 12 volt batteries need to be paralelled in order to maintain 12 volts d/c.

Ditto Craig!
Install a main battery selector switch (MBSS) that will allow you to switch between the two banks and combine (ALL position) if necessary.
Your main cable now becomes connected to the "common" terminal of the MBSS.
IMO, best to mount this switch so it can be accessed outside of the engine bay!
If you search this forum, you will see many installations and methods for accessing the switch knob outside of the engine bay, yet keeping the cables within!

Use a cranking battery on # 1 position, and a deep cycle battery on your # 2 position if the intent is to run radios, etc while at anchor/dock etc.
Keep the # 1 bank in "reserve"!
That is your "get-me-started-and-running-so-I-can-get-home" bank.

.

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Rick E. Portland, Oregon
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Twin 270 HP 5.7's w/ Closed Cooling
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Adding Aux. battery 26 Jun 2009 03:21 #4

  • jwilse
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Thanks for the info. sounds good . I will be adding a switch and I will check on a few other install projects for mounting ideas but I believe I am on the right track . Thanks again to you guys for your help. I do run riggers etc. and would be using power when anchored so I want to have the back up battery to be sure I can fire up the engine .
Off to check out other installs
Thanks again,

jwilse

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