Hi, thanks for your replies. Not exactly what I was hoping to hear!! Could some sort of gearing/pulleys not reduce the load on the motors while increasing the jet drive speed? Alternatively if I replaced the head of say a 15hp outboard with an electric motor and used that instead of the jet drives what would the difference in efficiency be?
Plan C sell it for scrap value...
Cheers
Alan
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Hi Alan,
>
> You're suggesting an extremely difficult project. You boat came with twin 750cc engines that totaled 180hp. Because jet drives are notoriously inefficient at low speeds, the typical electric drives used in most of the conversion (5-10kW) may not provide even the slow speed cruising that you're talking about. But for now, let's assume that twin drives running at 5kW (6.5hp) are sufficient for your use.
>
> Without getting into the details about the drives, we can estimate how well various battery packs can support your 10kW (2 x 5kW) load.
>
> 1) 11.3kWh of golf cart batteries - 500 lbs, $1200, will supply 10kW (5kW x 2) for just under 20 minutes to 60% depth of discharge.
> 2) 10.7kWh of AGM batteries - 520 lbs, $2600, will supply 10kW (5kW x 2) for almost 33 minutes to 70% depth of discharge.
> 3) 8kWh of Lithium (LiFePO4) batteries, 200 lbs, $3500, will supply 10kW (5kW x 2) for almost 35 minutes to 80% depth of discharge.
>
> I'm guessing that the 13hp that I quoted will move your jet drive boat at 5mph, give or take a bit (I actually think it will be slower). But really it is just a guess, I haven't seen any performance data on successful electric jet drive conversions.
>
> So you can see that the power demand for you boat is pretty steep, but with Lithium batteries that are about the size of 4 group 27 batteries, you should get about 1/2 hour of putting about. Add in $5000+ for two electric drive systems and you'll have a very expensive Seadoo that can't go fast or far.
>
> Like I said, this one is a very difficult project to be able to declare success with.
>
> Fair winds,
> Eric
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, aberdeino <no_reply@> wrote:
> >
> > Hello everyone, finally found this site after looking for electric boat conversions.
> > I have a 14' 1995 seadoo speedster with both damaged engines removed and am keen to convert to electric as spares/engines etc are not easily to find and also at nearly £7 a gallon of petrol its ridiculous.
> > Am just looking for slow cruising and would appreciate any advice as to how possible this is and what type of inboard electric motors\batteries I could use?
> > There is a large enclosed area where the two engines and 100litre petrol tank was so it should hold quite a few batteries....
> >
> >
> > Cheers
> >
> > Alan
> >
>
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