Onboard Charger

[slonezp]

So, I have two trolling motor batteries. I put my single charger on one battery at a time. Is this right or am I  wrong in doing this?

You're good 

[Kevin22]

So, I have two trolling motor batteries. I put my single charger on one battery at a time. Is this right or am I  wrong in doing this?

 

 

Perfect! 

[TetraFish'n]

 

It won't work. Think about it. A 36v trolling motor will have battery #1 with + lead connected to motor and - lead connected to + lead of battery #2 which will have - lead connected to + lead of battery # 3 and - lead connected to the trolling motor. If you connect the charger leads to the + and - leads on battery #1 there is no way the other 2 batteries will charge. Theoretically, if the batteries were wired in parallel, it may work, but I think you would at least triple the charging time if not more.  

 

That's what I was thinking, thanks for confirming. My previous boat had a 24 V trolling motor and the batteries were hooked up to two different banks. A person that works for the company that's building my boat was trying to say differently. 

 

[ejweaver]

I have a pro sport 12 with a deep cycle battery for the trolling motor and a marine for the starter of the OB.  Since I have to store the boat at a storage facility, can I plug in the charger and leave it plugged in until I go back out fishing (2 -3 weeks in between)?  I don't want to have a problem with damaging the batteries by keeping the charger plugged in all the time if it isn't safe to do so.  Thanks for the help

[Wayne P.]

 

 

 

If it were set up that way, one bank charging three in a series, would it just result in a very slow charge? Or would other problems arise?

 

 

One 12V bank is not going to charge a 36 V battery. Three 12 V batteries in series is 36V.

 

A multi-bank charger is 12V per bank, there is no 36V output. You connect each bank to a battery and they get charged at the charger rate per bank at a little over 12V each.-typically 13-14 volts.

It doesn't make any difference what device is connected to the batteries a long as they are separate or in series, it is still separate 12 V batteries changed individually.