Posts: 31
Location: Fairfield, IA | Guest,
Not quite certain of how you are defining 'onboard charger'. If you want to charge the cranking battery with your outboard, when your outboard is running, I believe you can only charge your crank battery. This is a separate unit connected to your big motor and is designed to charge the crank battery only.
If instead you want to hook up a charger to charge all your batteries, I believe you would get a 2 bank charger. One is for the cranking battery and the other cable would be for your two trolling motor batteries. Since you have in wired in parallel, one charger cable would cover these two batteries since they are essentially charged as one large battery. Connect the positive on one battery and the negative on the other battery. I suppose you could get a 3 bank charger and charge each of your trolling batteries individually, but I believe to do that you would also need to add some type of cut off switch or isolator to electrically separate the two batteries during charging.
Do a search on here as there are numerous posts regarding batteries and the way to hook them up.
If you have a 12 volt motor, that is designed to be 12 volt only, I would not ever hook your batteries in series. That would put 24 volts to the motor causing you a big problem.
I have three Interstate batteries and a 5/5 ProMite battery charger. 5 amps to the cranking battery and 5 amps to the two trolling motor batteries wired in parallel. For my amount of fishing, 2 - 3 times per week, it works just fine. If you are fishing daily or frequently with long periods on the trolling motor, you may want to move up to a higher amp charger. More amps recharges more quickly.
Good Luck,
Dave. |
