2000 Malibu LSV 23 Battery’s?

[alexcbevington]

We are needing a new battery for our boat with the Indmar 5.7 and we do a decent bit of sitting with the music playing and we were wondering what size battery to get and if we should do dual battery’s.

[minnmarker]

Dual batteries with one dedicated to the stereo. Do not combine starter and stereo. I like an a ACR to charge the stereo batt, others like Perko switches.

Lead acid is lead acid. Walmart.  Large deep cycle for stereo, reg for starter.

[alexcbevington]

8 hours ago, minnmarker said:

Dual batteries with one dedicated to the stereo. Do not combine starter and stereo. I like an a ACR to charge the stereo batt, others like Perko switches.

Lead acid is lead acid. Walmart.  Large deep cycle for stereo, reg for starter.

Thank you! And what is an ACR and a Perko Switch?

Edited April 27, 2019 by alexcbevington

[minnmarker]

They're electrical switches.  Look them up or search this site for more than you want to know.  Basically ways to not drain your starter battery while using/charging the stereo battery.

[formulaben]

9 hours ago, alexcbevington said:

Thank you! And what is an ACR and a Perko Switch?

You won't regret it.

https://www.bluesea.com/products/7650/Add-A-Battery_Kit_-_120A

https://www.walmart.com/ip/Everstart-Maxx-Lead-Acid-Marine-Battery-Group-29DC/49988415

[formulaben]

And since the next question will be how to wire it up (there are several ways and many opinions...) here is my humble suggestion. 

If you want house loads on starter battery, then just move that lead to the other side of the switch.  I chose to put all house/stereo loads on 2 Group 29 batteries and a smaller starter battery isolated to the starter circuit so that there would be I would be able to start no matter how low the house batteries became.  The 2 batteries allow me to play the stereo for quite a long time before low voltage becomes an issue which is pretty much never these days.  FYI don't let any battery go below 11 volts; 11.5 is a better practice.

Note that in this installation that the ACR (automatic charging relay) is NOT on the same side of the switch as the batteries (unlike the wiring diagram offered by Blue Seas.)  This is so that when you hook up the battery charger it won't close the relay and combine all batteries; totally necessary with a dual-bank charger. 

Hat tip: @shawndoggy

[MLA]

21 hours ago, alexcbevington said:

if we should do dual battery’s.

Im a huge fan of a simple dual bank setup. For a single bank, I would suggest a group 29 or 31 dual purpose for the most cranking and reserve capacity. 

For a dual bank, a basic group-24 for cranking and at least a group 24 deep-cycle for the house, will give you a few hours play time with engine off.