Steven,
One of the guidelines for sizing an electric conversion is to provide a minimum of 1kW of electric drive for each tonne of displacement. So you're going to want a system that can run at 8kW continuous. Installing a system in the 10kW range should be just as efficient and can provide a little extra reserve for adverse conditions. I would recommend against installing a system in your size boat that can't deliver 8kW continuous.
There are a number of companies that can provide a "turn-key" system of this size: ASMO, Electric Yacht, Propulsion Marine, and others. I believe that in the long run, these prepared and tested drive systems are not much more expensive than the trial and error process that most DIY installations go through. In any case, quality components can increase the reliability and usability of the electic drive system.
Good luck with your project.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "commingback777" <commingback777@...> wrote:
>
> Hello everyone. We are now serously thinking of changing out our diesel motor to an electric varient. I cannot see spending a small fortune for this so surplus parts are in order. We have joined this group for advise and to share our goings. Our boat is 42 feet x 12 - 8 tonnes. We currently have a 2 cylinder diesel SABB with flywheel. We also have solar panels, a diesel welder/generator so recharging a bank of batteries is not a problem. We have plenty of room in the engine compartment now, so in thinking we can increase our ship storage to be converted to a shop.
>
> We welcome all replys. Thanks in advance. Steven
>
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