While there are many difficulties in performing an unbiased comparison; availability of systems, suitable test platform(s) and cost in time and money to conduct the test, you can try to get real world data from converted boats that are similar to yours.
There's more to your requirements than the length of your boat, displacement, underbody configuration and the like. And horsepower rating isn't as relevant in electric propulsion systems, you may be better served by looking at Kw (volts X amps) ratings. I think that 5Kw and 6Kw systems should be sufficient for your boat (without knowing much about your boat).
The systems that you are looking at seem OK. None of the prices you listed appear to include the batteries, so you should keep that in mind too.
I suggest that you also look at Propulsion Marine in Santa Barbara
http://www.propulsi
James has been successful at developing a very efficient system, backed up by real world measurements. His systems are very complete and he has the ability to tailor the components to match more specific requirements. My only involvement with Propulsion Marine is as a customer.
Fair winds,
Eric
Marina del Rey
--- In electricboats@
>
> Hello,
>
> Has anyone done a comparison of existing electric motor / controller packages in the 6-8hp equiv range? I am not very interested in re-inventing the wheel. I can find 4 packages available from;
>
> Beckman electric – uses gearbox - 24 volt system $4,290.00 48 volt system $4,910.00 The motor / gearbox seems well thought out, but the web site and details are weak.
> http://www.steamboa
>
> Electric Yacht - $3,995 motor only – 130lb system, $5495 – 260lb Excellent web site, motor seems to use belts, which is odd (can only find a pic in one of the video's)
> http://www.electric
>
> Technipower / Solomon – ST 37 - $9,390 motor, $14,203 complete, very well proven system but seems too expensive unless efficiency is much better.
> http://www.technipo
>
> Thoosa 6000 6kW Drive System, 48V $7,007.00 motor, $9,000 complete. Looks new to the market,
> epsystems@..
> http://www.ngcmarin
>
>
> If anyone has done an analysis, looking at efficiency, etc, or has any imput / suggestions I would be very interested.
>
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