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1+2 Type Battery Switch to Blue Sea 5511E and 7610 ACR help.


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On 6/12/2016 at 9:35 AM, shawndoggy said:

Well, sorta.  If your stereo battery is heavily depleted, the ACR has a safety that will keep the batteries separated to save your alternator from getting hit with a huge load.  The under voltage lockout is 9.5v, though, so that's pretty low.

How big is your stereo?  If you are really rocking a system hard without being charged, a single group 29 is going to do "OK," but it isn't a "pound all day at the sandbar" battery bank by any means.

How the ACR works is that the alternator will always charge the battery that's on the same side of the switch as the alternator.  If you wired as in my diagram, that would be the starting battery.  If the stereo battery is above 9.5v, the acr will combine when the boat is running to allow the alternator charge both batteries, but the ACR is not "smart" in a way that would put power to one or the other battery.  Whichever battery is on the same side of the switch as the alternator, that battery will always be charging and the other battery will get charged when the ACR combines.

The other thing to think about tho is that if your stereo battery is heavily depleted (say mid 10v, so high enough that acr will still combine), just running the boat around for 20 minutes is not going to get it back to full charge ever.  It may just be that you need a bigger stereo battery bank to keep up with how you want to use your stereo.  This is where people start looking at multiple group 29s or the two 6v golf cart batteries run in series to come up with a mega bank for the stereo (IIRC 2x GC batteries = about same reserve capacity as 4x Group 29s).

 

Thanks this make sense. 

 

My Duracell (3yo old bat) seems to power the system from around an hour or so. Do you guys think it would be wise to make this my starting battery and switch the fresh interstate srm 29 for the stereo? 

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