Most of comments everyone has said about this project are insightful. I would also add a question of the use of the system as a trolling motor. 3hp motor will give you the power to do the 2.5 knots you are looking for but I would think you would want more. You may encounter currents and wind and will need more power to maintain your trolling of to keep you in position. Additionally as a single screw boat, the "get home" character of an electric motor should also be considered and moving the boat at 4+ kts is likely a good speed.
I ran the boat through our projection software and can see pushing the boat up to about 4.5 within the high end of your 5kw generator. As others have said there will be loss due to the conversions and using chargers or power supplies to get to a DC battery bank. With a 400AH battery bank we are also projecting over 15 hours run time at 2.5 knots.
The projections accuracy is impacted by the nature of your hull and running gear. I would have our propulsion engineer run his model with additional boat characteristics to get a more accurate projection.
Mike
Electric Yacht of Southern California
--- In electricboats@yahoogroups.com, Orest Iwaszko <orestyko@...> wrote:
>
> Thanks for the response James , This deal comes with a variable speed controller. Yes Ill have to find a 220 volt 3000 watt inverter. Does 160 volt 3 hp sound doable eventually from batteries ?
>
>
> On 2012-12-11, at 10:37 AM, James Sizemore wrote:
>
> >
> > You will need a 3kw inverter. And the cheaper induction motors are normally on/off full speed so it might be hard to use in close quarters, unless you drop some euro's on a variable speed controller. But sound like an interesting project, for only a thousand or so expense.
> >
> > On Dec 11, 2012, at 12:03 AM, Orest Iwaszko <orestyko@...> wrote:
> >
> >>
> >> Im back , Been drooling in my dreams about the magic you are creating . Ive come across a 3 hp 160 volt dc motor with a controller for $ 600. The controller needs 220 volts. input.
> >> My boat is 34 feet and I only want to use this system for up to 3mph tops. Mostly 2.5 mph or less.
> >> My boat has a Northern Lights 5 kw genset with both 110 and 220. So Im able to run off the gernerator. and would aquire a 220 volt inverter.
> >> The dc motor will turn my 1.5 inch shaft with 20 inch prop at around 400 rpm for fishing
> >> dc motor spins up to 1750 so at 900 rpm motor with a 3 /1 reduction my shaft should turn 300 rpm .
> >> Im thinking to spin the shaft with a pully belt system .
> >> I have 6 golf cart batteries used at 12 volts for the house system and for this project and would like to add solar panels and wind generator eventually .
> >>
> >> Is this perusable in your opinion.
> >> Orest 34 foot CHB
> >
> >
>
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