Dual Battery Schematic

[Trevor Shipman]

in the middle of installing the blue sea dual batter setup and getting a little confused on the install. I recall someone on here created a simple diagram for dual engines anyone have that handy?

Thanks!

 

[FLBulldogger]

Here you go:

There are three types of switches and 3 setups you will want to consider here.

1. Parallel setup. This will effectively make one big battery. You can do this with your current switch, all you'd need is 2 power cables (one red, one black) and you are all set. This setup would be charged by the engines. The down side is...if you drain the system listening to the stereo, BOTH batteries would be drained.
   
2. Separate Starter/house battery set up. In this config, each battery will have a common ground, but the + sides will be isolated. In this setup you would want another battery switch to enable you to shut off the 2nd battery. You can also buy a new switch that would allow you to turn both on at once and combine them (On/Off/Combine switch). In this setup the stereo could only drain one battery.

I prefer option 2.

You can get an ACR (automated charging relay) that would go in #2 to allow both batteries to get charged by the engines.

There is a 3rd way of wiring it....as a 1 or 2 system - effectively this has one battery connected at a time:

3. And Lastly is the option Yamaha has started installing and it uses 3 switches. This gives you the ability to only turn on what you want to turn on (I do like this setup).

 

[swatski]

in the middle of installing the blue sea dual batter setup and getting a little confused on the install. I recall someone on here created a simple diagram for dual engines anyone have that handy?

Thanks!

Also, check @txav8r posts, he posted several great schematics with good discussion like this one:
https://jetboaters.net/threads/dual-battery-question-2007-yamaha-sx230ho.9369/#post-160585

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