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3 Bank - Onboard Charger


Buzz's Avatar
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06-10-10, 08:20 AM   #1  
3 Bank - Onboard Charger

I have a 2007 Lund ProSport that has three batteries, two for trolling motor and one for starting.

I am planning on installing a 3 bank charger close to the front (somewhere under steering console) as this is close to the two trolling motor batteries.

Now for the starting battery I thought if I can find the two wires under the console that ``feed`` from the starting battery to supply auxiliary power to the console, then I could connect one set of leads from the onboard charger here rather than run new wiring all the back to the starting battery.

Does any one see a problem with this? I am a little green when it comes to boats so just want to make sure I am not missing something here.

If any one is familiar with this boat do you know where I might be able to find a wiring diagram for this model as I have some future upgrades I would like to do as well?

Thanks, appreciate all feedback!

 
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Rick Johnston's Avatar
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06-10-10, 01:21 PM   #2  
It's really important to know whether the trolling motor is 12 volts (two batteries in parallel) or 24 volts (two batteries in series).

Look at the two TM batteries. If the positive of one is connected directly to the negative of the other (series-wired) you have a 24-volt TM.

You cannot connect two banks of a three-bank charger to those batteries without first disconnecting them from each other.

As for the house battery, the only problem I can see with not connecting heavy wires directly to the battery is if the battery is completely drained. Using the lighter-gauge aux wiring could be dangerous if the battery charger needs to feed 50 amps down those wires.

 
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06-10-10, 01:38 PM   #3  
Thanks for the reply, it is a 24v trolling motor but hooking up all three banks should not be a problem. This charger only charges one battery at a time in a rotating sequence. It switches every 5min to different battery. So even though the two T.M. batteries are in series they can be both attached to the three-bank charger safely. (I Hope J)

My biggest concern was being able to connect the third bank (starting battery) to the feed that comes from that battery to the console. I wasn’t sure if there was something about marine electrics that I may have been missing.
The charger is 15 Amps max so hopefully all is good.

Thanks again

 
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06-11-10, 03:50 AM   #4  
What's the make & model of the charger?

If the charger's three negative leads are isolated from each other and switch along with the positive leads, you're good to go.

However, if the negative leads to the charger are tied together -- as most are -- they will cause a direct short when you hook them up. Please be careful!

With 15 amps max you shouldn't have a problem backfeeding along the house wiring to the starting battery.

 
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06-11-10, 07:02 AM   #5  
The charger is this one
Mastercraft Nautilus 15A Onboard Battery Charger | Canadian Tire

It is listed for use on 12,24 or 36 volt systems. Just to make sure I contacted Customer Support this morning and they assured me there is no problem with my hook up.
Thanks again!

 
Rick Johnston's Avatar
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06-12-10, 03:45 AM   #6  
Thank you for checking. Believe it or not, I worry about stuff like this.

 
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06-20-10, 08:18 PM   #7  
Thank you for checking. Believe it or not, I worry about stuff like this.
Hey I appreciate that, I am a notorious double and sometimes triple checker and on the odd occasion it has saved my bacon !

Just to follow up I installed it and it works like a charm…thanks for the input.

 
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