And one more point a 200AH lifepo4 pack has twice or better the usable
amps for traction applications as lead, so you can step down to say
the 160AH and still have more then a 200AH lead pack by far.
On Jun 23, 2009, at 11:01 PM, James Sizemore 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@
> > ]
> > On Behalf Of Peter van Hardenberg
> > Sent: Monday, June 22, 2009 11:35 AM
> > To: electricboats@
> > 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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