@nick (belated) thanks, you may well be right on that. We will try both in the end, but for the first build the flywheel gives a solid mating point for the torque-converter. I am less worried about excess weight and more about twisting the 30+ year old sterndrive shaft to pieces.. jikes!
Also time for project update as we have Big news!
-The Kostov 11" 250V arrived! but that is small potatoes becuase our build has been selected as a EVTV contest finalist! more details at
http://www.projectooc.com/evtv/finalist_review.php?finalist=finalist9
You will also find pictures of the V174 there..
regards,
AK
--- In electricboats@yahoogroups.com, Nicholas Luker <nickluker@...> wrote:
>
> Hello
> from another evtv fan
> and some one also thinking of converting there boat
> you can lose the flywheel as it sbasicaly just there to smooth out the bumps
> from the ICE engine at low speed and also increases torque at low rpm as ICE
> engines only give low torque at low rpm's due to the low number of bumps per
> second ( ie low number of piston pulses per minute)
> I think with the torque of an electric motor a flywheel is just an energy
> robber
>
> Nick
>
> On Fri, Apr 15, 2011 at 4:08 AM, ams_ak@... <ams_ak@...> wrote:
>
> >
> >
> >
> >
> > So 2 1/2 months later, time for an update.
> >
> > We now have 2 Bayflite V174's in the workshop.. one is stripped bare, ready
> > to take the flooring out. This one will be rebuilt with the new lithium pack
> > in mind.
> > The second is ready to go, sans engine and tank. This will be the test
> > boat, and will be the first home for our new parts.
> >
> > The parts list has changed a bit.
> > Kostov 11" 192HV is now 11" 250V
> > 60*100Ah LiFePo4 is now 91*90Ah
> > Soliton1 controller remains.
> >
> > So we are adding 60 kg of lithium, making a 26kWh pack and allowing for the
> > higher voltage motor. The motor is confirmed and should be getting to us in
> > 10 days or so, v excited about the unboxing :)
> > Controller and lithiums should be in by the end of next month.
> >
> > Work will focus on mating the 11" to the flywheel in the volvo penta AQ270
> > sterndrive. And making sure the motor stays put.
> > As for parts, we will now be looking at (making our own) high capacity
> > charger and DC-DC converter. Just been looking at the no1 EV show and they
> > were talking about the vicor PFC megaPAC. very cool, but hard to tell which
> > versions would be the one to get.
> >
> > then there is the question of waterski's :P
> >
> > AK
> >
> > --- In electricboats@yahoogroups.com, "ams_ak@" <ams_ak@> wrote:
> > >
> > > Thanks for the input all.
> > >
> > > -Eric
> > > The 10 kWh / Gallon measure is interesting, and another way of showing
> > that the 80*100Ah setup would not be a bad idea. Storage would then be 25.6
> > kWh, usable roughly 20 kWh. Bit more of a buffer and performance is
> > increased in spite of the weight gain, due to better overload power (or so
> > it is said).
> > > Still a 40 kW motor is going to eat any battery pack tout suite at WOT.
> > >
> > > Which ties into the usage / generator replies.
> > > I've considered generators from the get-go, and a wide variety at that. I
> > own a little Solar Panel resale and installation business, so you can
> > understand I lean slightly more toward the so called renewable generators.
> > All in all, there are just so many ways of getting juice into your pack, and
> > that is one of the cool features of a battery driven vehicle.
> > > For my conversion, or at least for now, I feel I can leave all the
> > generating outside of the boat. I have enough power for day trips city side.
> > When i go nature / lakeside I have the advantage of knowing people all along
> > the way, so a limp in to port is always real close. Seaside however, that
> > might be the day I want the Honda.. or a friend with a bigger boat!
> > > The city of Amsterdam is also helping out by installing a few new
> > charging stations every month, with free juice (until 03-2012).
> > >
> > > All this talk of draining the batteries is distracting. There are A LOT
> > of parts which can fail before I get that far :)
> > >
> > > AK
> > >
> > >
> > >
> > > --- In electricboats@yahoogroups.com, "Eric" <ewdysar@> wrote:
> > > >
> > > > AK,
> > > >
> > > > I've been reading the posts concerning your planned conversion, and it
> > looks like the most realistic proposal for the conversion of a speedboat
> > that has been covered here. The key factor is your planned usage (use case).
> > Recognizing that most of your time will be spent at low speeds in the canals
> > will allow you to achieve reasonable use on a single charge.
> > > >
> > > > A rule of thumb that I use to evaluate a battery bank capacity to
> > gasoline usage is that 10k-11k Watt Hours (Wh) of battery last about as long
> > as 1 gallon (4 liters) of gasoline through an ICE. Your proposed 60x100Ah
> > bank has about 18,000 Wh total storage or about 14.4k Wh of usable (to 80%
> > depth of discharge). So your proposed batteries should act alot like 5-5.5
> > liters of gasoline. You've probably noticed that a day of canal cruising
> > doesn't use very much fuel, that is in your favor. However, your 130Hp ICE
> > can probably burn more than 40 liters/hour at WOT. I figure that if your
> > proposed setup can deliver the same performance (it should be close), then
> > you would also be able to drain your batteries completely in less than 10
> > minutes at WOT.
> > > >
> > > > So I think that your proposal is sound, as long as you accept the
> > limitations. I had to go through the same process when I replaced a 2hp ICE
> > outboard on my dinghy with a Torqeedo 801. The dingy performs about the
> > same, but if I consistantly try going fast, the battery doesn't last very
> > long. The better that I manage the battery, the more pleased I am with the
> > overall performance of the electric solution.
> > > >
> > > > Fair winds,
> > > > Eric
> > > > Marina del Rey. CA
> > > >
> > > > --- In electricboats@yahoogroups.com, "ams_ak@" <ams_ak@> wrote:
> > > > >
> > > > > Roderick, Dave, thanks for the thumbs-up. I felt that the power and
> > weight advances in parts now reasonably available would make this conversion
> > feasible, glad to find I am not alone.
> > > > >
> > > > > -Rod
> > > > > The Canals in Amsterdam are fresh water and there would be no plans
> > for going out on the Northsea any time soon, unless I go a little Wilde
> > myself. Still the plan will be to keep the motor dry, much more so than the
> > ICE in the original setup. I am leaning towards the Winston (Thundersky)
> > LiFePo, in part because I could then source motor-controller-battery from
> > one place within the EU (Kostov).
> > > > > Cool that you are expanding your interest to this side of the
> > Atlantic. I saw your LR challenge a while back and remember thinking we
> > could use some more of that over here!
> > > > >
> > > > > -Dave
> > > > > There is a forced air cooling fan available with the Kostov, making
> > cooling more independent of RPM. Probably a good addition for this setup.
> > > > >
> > > > > So I wont be too heavy, and I should have enough power, but range
> > will still be a question. I posted the weight calculation for 60 100Ah
> > lithiums, in part because it shows that the new setup could be a little
> > lighter than the original. Kostov recommends going with an 80 x 100 setup,
> > extending range and high RPM (voltage) performance. It adds 70 kg / 150 lb
> > but if budget allows... well thats always the if :)
> > > > > Either way the motor and controller will be capable of draining the
> > pack real quick, so its a good thing you can also really get a kick out of
> > quiet slow speed cruising. And maybe sneak up on some fish ;)
> > > > >
> > > > > AK
> > > > >
> > > >
> > >
> >
> >
> >
>
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