You have 270 H.P. in those 2 diesel which is = to 746 x 270 Watts. = 200 Kw. so to replace those 2 engines you will need a 200 Kw generator.
On Tue, Apr 9, 2019 at 8:50 PM oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
I'm looking at buying a 38' trawler that currently has twin 135hp Perkins diesels.Hull speed - 8.2 knots / 9.5mphWeight - about 20,000 poundsSpeed at 1000 RPM on both engines is about 5 mph, at 1500 RPM is maybe 6.5? Max RPM should be around 2500.I don't have the spec for the props.Just as a mental exercise (brain fart...) - how ridiculous would it be to convert this to a hybrid electric?The thought would be to pull the two diesel engines, replace with electric motors - very possibly AC? And drive them from a generator.Could I drive both engines with a reasonably sized self contained Honda generator? (I would think certainly at slow speed....)It seems like it might be a little easier (and significantly more efficient) if I skipped the battery bank (I'd never be able to afford a big enough one anyway) and just connected AC motors directly to an AC generator.It would still get me away from two huge diesel engines, and eliminate all the through-hulls, pumps, etc...Honda makes 5KW generators for about $3K... And a 9KW generator for $5K.I suspect it probably isn't practical, but thought it might be an interesting thought to propose.I know someone on the list converted a 40-ish foot Chris Craft - but still uses batteries, and only goes a few mph.I'm wondering how fast I could get if I had a 5KW generator or even 9KW generator driving it...Though even with 9KW, that would still be only 4KW per side (and probably not constant load).And then there's the reality that a Honda generator probably isn't intended to be used on a boat in a salt water environment (an inland lake environment would probably be pushing it...).But just as a thought - could I get large enough AC motors that can be speed controlled to work driving a boat?John
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Posted by: Douglas Kay <dougkay8@gmail.com>
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