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| Lots of info on the battery hook up.
Here is some good standby info.
Batteries connected in "parallel" double your amperage while the voltage remains 12 volts.
Batteries connected in "series" double the voltage while the amperage remains the same.
If the batteries used are the same in crank amps and voltage the above is true.
I have ran demolition derbies for nine years and have always used two "egual" batteries hooked in series for starting the motor should it overheat and stall.
Should you need 24 volts to run your trolling motor and still only need 12 volts for your system ( lights, depth finder, etc, Than make sure you connect your systems power line to the "grounded" battery only.
In the demolition cars I ran the starter motor, only, on 24 volts.
Sworral is correct as 10 gauge is plenty heavy enough wire.
It's not so much as the smaller wire not have the capacity to carry the heavier voltage. The smaller wire creates more resistance to heavier voltage and will get very hot and a fire can be a problem.
!2 gauge wire would work ok but the further the electrical item ( trolling motor) is from the power source ( battery) the larger the wire should be. There are formulas to use but definetly the 10 gauge wire is heavy enough.
As far as triple the hours you can run, I don't know as I have never checked into it, but it sounds reasonable as you would have more power at hand.
[:p]
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