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On-Board Charger for Cranking Battery
LSF Member
Joined:
09/07/2009
From Minnesota
Posts: 693
Hey guys, so right now I have three 12 volt deep cycle battery's in my boat. Two for the trolling motor, one for the fish finders, and then one cranking battery for lights, gauges, livewell, draining, and motor of course. What I have found is after a few weeks sitting, the cranking battery will get low and not be able to always turn the motor over. I am looking into getting a two bank on board charger right now. The reason for this is I have a two bank charger for both trolling motor batteries, but would like another two bank charger for the fish finder battery, and cranking battery. Am I able to get an on board charger for this? Or could there be issues with blowing fuses if a charger is hooked up to the cranking battery?

Posted on: 3/31 18:27:03
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Re: On-Board Charger for Cranking Battery
LSF Member
Joined:
02/16/2015
Posts: 268
You can absolutely add an onboard charger to the cranking battery.

Posted on: 3/31 20:15:28
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Re: On-Board Charger for Cranking Battery
LSF Member
Joined:
09/07/2009
From Minnesota
Posts: 693
Would a 2 bank 8 amp charger be enough to charge the two batteries? Not quite sure what the difference between 8 and 10 amps would be

Posted on: 4/1 15:27:40
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Re: On-Board Charger for Cranking Battery
LSF Member
Joined:
02/16/2015
Posts: 268
2 bank 8 amps means 4 amps per battery. 10 amps would mean 5 amps per battery/bank. The 10 would charge faster than the 8 because it has more amps.

Posted on: 4/1 15:52:35
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2017 Alumacraft Competitor 175 CS
2017 Yamaha F115
2015 Minn Kota Powerdrive V2 70lb. 60" w/ I-pilot Link
Humminbird 899ci HD SI
V4 Lakemaster MN
V4 Lakemaster WI
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Re: On-Board Charger for Cranking Battery
LSF Member
Joined:
01/07/2016
Posts: 84
Your starting/ cranking battery should not be going low after a few weeks of sitting . You have a weak battery.

Posted on: 4/1 16:51:47
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Re: On-Board Charger for Cranking Battery
LSF Member
Joined:
10/17/2010
Posts: 326
Quote:

Bigfatber wrote:
Your starting/ cranking battery should not be going low after a few weeks of sitting . You have a weak battery.



+1
Or you have a draw somewhere.

Posted on: 4/1 21:13:01
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Re: On-Board Charger for Cranking Battery
LSF Member
Joined:
09/07/2009
From Minnesota
Posts: 693
I reported the boat from a 100 horse two stroke, to a 115 horse four stroke this past summer. Would that pull more power from the battery? Should I get a larger cranking battery?

Posted on: 4/1 22:13:33
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Re: On-Board Charger for Cranking Battery
LSF Member
Joined:
09/07/2009
From Minnesota
Posts: 693
I reported the boat from a 100 horse two stroke, to a 115 horse four stroke this past summer. Would that pull more power from the battery? Should I get a larger cranking battery? This is a pic of the battery I have now. I believe it's two years old, going on three this summer

Attach file:



jpg  IMG_5016.JPG (2,088.59 KB)
9708_58e06d5fd2dd3.jpg 4032X3024 px

Posted on: 4/1 22:17:10
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