There is a point he makes in his articles which could be easily overlooked. Because you can take a higher depth of draw (DOD) with lithium (and to a lesser degree due to Peukert effects in lead-acid), you can get by with a smaller bank than equivalent lead-acid without compromising cycles (in theory at least).
Valence has a little widget which shows this graphically (their chemistry is a little different than others, but same rules apply)
http://www.valence.
I would also advocate splitting lithium into 2 or more banks vs large single cells. Peukert is a non-issue, so no penalty for switching them, and nothing quite like the sense of confidence knowing you have a fresh bank available if you experience a cell failure or just a long load. The pricing slightly favors larger cells, but at a bare fraction of the total. You've also got both redundancy and sparing in this config (being error prone, I'm big into redundancy..
-Keith
--- In electricboats@
>
> I don¹t think Nigel lives on the breeding edge of technology. Sure, he uses
> the latest stuff on the market, but except for a few, very expensive niche
> products, LIFEPO4 batteries are not on the market yet, while TPPL are. You
> can order a 12v 8D sized Odyssey battery, try that with a LIFEPO4.
>
> Give it a year or two, and I would not be surprised that he is singing the
> praises.
>
> Chris
>
>
> On 7/24/09 12:27 PM, "Nick Evans" <qgold.77@..
>
> >
> >
> >
> >
> > Maybe we shd tell him about the group - most of the experts in the field
> > are here - [:D]
> >
> > - Nick
> >
> > There's many a dip 'twixt ship and slip
> >
> > --- In electricboats@
> > , "JJ Johnson" <jjoftheusa@
> > wrote:
> >> >
> >> > HI EVERYONE,
> >> >
> >> > I have been looking at alternative battery chemistry for several years
> > and could never justify the extra expense of LI-ion. Then yesterday I
> > received the current issue of Pro Boat Builder. Nigel Calder has an
> > article on page 52 about his choice of battery chemistry for his boat.
> >> >
> >> > Go to <http://www.proboat.
> > issue to read his article. You might have to register but it is free.
> >> >
> >> > You just might decide to use TPPL (thin plate pure lead) batteries
> > instead of any LI-ION chemistry.
> >> >
> >> > While you are on the Professioal Boat Builder site check out the past
> > issues for other articles by N.C. He is going electric in a big way on
> > his new boat, but writes for the common boater which includes most of
> > us.
> >> >
> >> > Enjoy,
> >> > JJ
> >> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> >>
>
>
>
> [Non-text portions of this message have been removed]
>
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