Hi Bruce,
Simply stated, having the second battery aboard provides twice the energy. How you wire the batteries together doesn't change the amount of energy, but it does change either the voltage or the capacity (not both).
When wired in series you have a 24V 130Ah bank. When wired in parallel you have 12V at 260Ah.
Your load (motor) will determine which way the bank needs to be wired.
The 12V motor will run a bit more than twice as long from the parallel configuration than it would with a single battery.
The 24V motor with the series configuration will have the ability to provide more thrust than the 12V motor, but will consume more power when run "wide open".
At lower "throttle" settings the power consumption of either motor would the same.
So do you want the extended run time of the 12V motor and the parallel battery bank, or do you want the greater thrust of the 24V?
And FWIW, I can't see a 11' v-bottom hull weighing over 400 lbs getting anywhere near 13 MPH ( barely up on a plane) with ANY trolling motor.
-Tom
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Posted by: boat_works@yahoo.com
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