Battery Setup

rnsi

Petty Officer 2nd Class
Joined
Jul 11, 2004
Messages
104
Hello all-<br /><br />I've checked previous posts, but did not really find what I was looking for.<br /><br />I currently have 3 gel batteries onboard with a Merc 150. 1 "standard" gel for starting, and 2 deep cycle gels in parallel for other stuff. Over the winter I'll rewire to make sure everything else is off the starter. Once a year I check the batteries charge capacity, and this year they were still at about 98 to 120% of the rating. I'll replace a battery when it gets down to about 75%.<br /><br />I have a ON/OFF switch between the two banks. When running, I turn to ON to charge all three batteries, and when stopped, I turn to OFF to save the starter battery. It's worked ok so far...<br /><br />Problem is, I keep forgetting to hit the switch. It's only a matter of time before I'm rowing home.<br /><br />I've used isolators in my RV's for years with no problems. How are they on the water? The boat is trailered, fresh water only, and I'm on the water once a week. Once or twice a year I'll be on the water for 4 or 5 days straight. I'm looking to have one less thing to think about, but is there a reliabilty issue with isolators on the water?<br /><br />Also, is there a problem hooking up my charger to the system with an isolator in place?<br /><br />Will the standard voltage regulator from a 92 Black Max 150 be enough to handle 3 batteries or should that be replaced?<br /><br />Thanks for any opinions...
 

LubeDude

Admiral
Joined
Oct 8, 2003
Messages
6,945
Re: Battery Setup

Just charge the batery for the engine with the engine, your charging circuit isnt heavy enough to charge anything but the one battery.
 

rnsi

Petty Officer 2nd Class
Joined
Jul 11, 2004
Messages
104
Re: Battery Setup

Can the charging circuit be upgraded?<br /><br />Hey LubeDude - where is your capacity plate? I never found mine.
 

rnsi

Petty Officer 2nd Class
Joined
Jul 11, 2004
Messages
104
Re: Battery Setup

I wonder if that's why I just replaced a voltage regulator...
 

Ralph 123

Captain
Joined
Jun 24, 2003
Messages
3,983
Re: Battery Setup

Check into a battery combiner:<br /><br /> http://www.westmarine.com/webapp/wc...ogId=10001&advisor=creatingabatterysystem.htm <br /><br />In short, they are marine grade voltage sensing relays that switch on when the system is charging and off when they are discharging. They therefore isolate your starting battery from you house batteries. Very easy to install and work great. I have been using them for the last 3 seasons in my 3 battery system and never have any problems.<br /><br />You can increase your engine charging capacity by upgrading your alternator. For example, Balmer makes versions capable of charging several banks at the same time and even in isolation (eliminating the need for a combiner)
 
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