Good point Ben. I didn't know they made 48V motors. The first thing I notice looking at the Minn Kota site is that they are expensive (average around $1000) and seem to be in the 50-60 lb thrust range. I'm interested in moving a small boat over a long distance, so I don't need a lot of thrust. It would be cheaper to buy a new battery, which would defeat my purpose of getting dual use out of a battery that cost me almost $600.
Kellan
--- In electricboats@yahoogroups.com, Ben Okopnik <ben@...> wrote:
>
> On Wed, Sep 21, 2011 at 07:30:28PM -0000, Kellan wrote:
> > Hi,
> >
> > I have a 48V 15ah lithium ion (LiFePO4)battery that I use for an electric bike I built. I would also like to use it to power a small boat, possibly my CLC Mill Creek 16.5 open cockpit kayak. The simplest thing for starters would be to use a stock trolling motor. Will I need to step the voltage down to 12V? Can I do that with just a resistor? If so, how do I determine what resistor to use.
>
> You could just buy a 48V trolling motor; there's a number of them
> available, e.g. Minn Kota sells a few different ones. You really don't
> want to use a resistor, since you'd be dissipating (read "wasting")
> battery power across it instead of using it to drive your boat - not a
> winning strategy.
>
>
> --
> Ben Okopnik
> -=-=-=-=-=-
>
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