I have 8 Sky Energy Cells coming from EVComponents. I will be building a 24v
pack for our Torqueedo. These differ from the Thundersky in that the fully
charged voltage is 3.6v, not 4.2. This is good if you need to build a 12v
pack.
Chris
On 6/24/09 10:00 AM, "aweekdaysailor" <aweekdaysailor@
>
>
>
>
>
> A BMS in there somewhere too right? Some of the BMS look like they act as
> charge controllers as well allowing the use of multiple charging sources I
> imagine.
>
> I'm excited to see people taking the plunge.
>
> -Keith
>
> --- In electricboats@
> , James Sizemore <james@...> wrote:
>> >
>> > 3.2-3.3 is the nominal voltage so 10 batteries is what you want. Plus
>> > add in say another 10 per cell for shipping.
>> >
>> >
>> > On Jun 23, 2009, at 9:51 PM, Rob wrote:
>> >
>>> > >
>>> > >
>>> > > I have a similar situation, but really want to go LiFePO4 if I can.
>>> > > That's
>>> > > about $1980. Do I have the calculation right using the prices here
>>> > > (someone
>>> > > posted this link recently):
>>> > >
>>> > > http://www.evcompon
>>> > >
>>> > > If I use 4.25V per cell. To get 36V, I need 36/4.25 = about 9 cells at
>>> > > 200AH. Each cell is $220 for the Thunder Sky, so that's 9*$220 =
>>> > > $1980.
>>> > >
>>> > > Right?
>>> > >
>>> > > From: electricboats@
>>> <mailto:electricboa
>>> [mailto:electricboats@
>>> <mailto:electricboa
>>> > > ]
>>> > > On Behalf Of Peter van Hardenberg
>>> > > Sent: Monday, June 22, 2009 11:35 AM
>>> > > To: electricboats@
>>> <mailto:electricboa
>>> > > Subject: [Electric Boats] Newport 28' Build Plans
>>> > >
>>> > > Hi everyone,
>>> > >
>>> > > I just wanted to share a few of my thoughts about an electric
>>> > > conversion and
>>> > > talk about some of the circumstances my local area and sailing habits
>>> > > require.
>>> > >
>>> > > I've posted a few times, so some of you may remember that I have a
>>> > > Newport
>>> > > 28' which I hauled an old Atomic-4 out of back in March.
>>> > >
>>> > > Basically, my boat is used for afternoon sails and for week-to-month
>>> > > long
>>> > > cruises of the Gulf Islands. I intend to use this rig mostly as a
>>> > > back-up to
>>> > > help me when winds drop en route and the current is shifting. In my
>>> > > part of
>>> > > the world, some of the passes will flood at as much as 8kts at their
>>> > > peak,
>>> > > so you want to be able to scoot through during slack.
>>> > >
>>> > > This means I see a need for two charging modes -- solar for trickle
>>> > > charging
>>> > > the house batteries and keeping things topped up while I'm not
>>> > > around, and a
>>> > > generator to provide outboard equivalence with less noise and fuss.
>>> > > I might
>>> > > add wind generation at some point just for added capability and to
>>> > > reduce
>>> > > the time the gennie runs, but I don't really expect anything from prop
>>> > > regen. There's also a bit of a Fuel Cell posse building up around
>>> > > here (this
>>> > > is Ballard country, I suppose) and I might consider installing a 2-4kw
>>> > > hydrogen fuel cell if one ever becomes available at a reasonable price
>>> > > mostly for the quiet operation and easy fuel transport.
>>> > >
>>> > > My calculations suggest that the 8kw MARS motor from Thunderstruck
>>> > > would
>>> > > require about 20hrs of charging per hour of operation at 4kw (about
>>> > > what I
>>> > > recall was my expected draw to make 4kts.) The Honda 2000i (sadly it
>>> > > looks
>>> > > like the Honeywell from CostCo won't be up to snuff) would provide
>>> > > about a
>>> > > 2:1 at 4kts. The idea would be that on the occasional "motoring
>>> > > day", there
>>> > > should be enough capacity to run 8hrs with the generator providing
>>> > > extra
>>> > > range.
>>> > >
>>> > > Now from what I've managed to work out it looks like 200Ah @ 36V
>>> > > should
>>> > > provide decent range at about the same weight as my old Atomic-4. If
>>> > > money
>>> > > ever starts to grow on trees or if the LiFePO4 batteries come down
>>> > > in price,
>>> > > I'd look into swapping that out, but you just can't compete with
>>> > > lead-acid
>>> > > for $/Ah at this point.
>>> > >
>>> > > That means my overall budget is something like (in CDN):
>>> > >
>>> > > $2200 - Thunderstruck kit
>>> > > $1000 - 12v batteries
>>> > > $800 - 200w solar
>>> > > $1500 - honda 2000i
>>> > > $500 - mounting, pulleys, prop
>>> > >
>>> > > Or about $6000 all told.
>>> > >
>>> > > Thoughts? One nice thing about this design is I can start with the
>>> > > motor and
>>> > > add components as time and funds allow.
>>> > >
>>> > > -pvh
>>> > >
>>> > > --
>>> > > Peter van Hardenberg
>>> > > Victoria, BC, Canada
>>> > > "Everything was beautiful, and nothing hurt." -- Kurt Vonnegut
>>> > >
>>> > > [Non-text portions of this message have been removed]
>>> > >
>>> > > [Non-text portions of this message have been removed]
>>> > >
>>> > >
>>> > >
>> >
>> >
>> >
>> > [Non-text portions of this message have been removed]
>> >
>
>
>
>
>>
[Non-text portions of this message have been removed]
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