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Posted by Mauried on September 6, 2008, 11:56 pm
 
wrote:


Anything can be done if people are prepared to pay enough for the
final product.
EVs with the performance and the range you want can certainly be made,
but not at a price that anyone will pay.
You might ask why the Solectra never went into mass production and its
pretty obvious why.
The cost of the batterys in it would put the car well out of most
people price range.
The original Selectra had 26 KWH of NIMH battery capacity.
In todays prices , that battery capacity would cost around 80K.
NIMH batterys are the most expensive batterys on the market for EVs ,
which is why most existing EVs still use Lead Acid or Lithium Ions.
Even Lithium Ions are still far too expensive for affordable EVs.


Posted by Russ in San Diego on September 8, 2008, 6:16 pm
 
On Sep 6, 4:56pm, maur...@tpg.com.au (Mauried) wrote:

snip


Actually, I think you've got it backwards. Lithium Ion batteries have
much higher energy density than NiMH, and are more expensive.  They
also have thermal runaway problems that become worrisome, from a
safety point of view, in large conglomerations.

Most commercial hybrids use NiMH battery packs.  The Tesla uses LiIon,
and PHEVs will probably use them -- but I'm not sure anyone has
figured out the thermal runaway solution yet.  Tesla seem to think
they've got a safe vehicle, but somehow, neither Japan nor U.S. major
manufacturers are ready to mass-market a vehicle yet.  Everyone knows
that Toyota wants a PHEV Prius on the market, but they keep pushing it
back because of the battery safety problem (not to mention the cost
issues).

Posted by Mauried on September 8, 2008, 10:52 pm
 On Mon, 8 Sep 2008 11:16:36 -0700 (PDT), Russ in San Diego


This battery is starting to look promising.
http://www.solartaxi.com/technology/zebra-battery/

Only downside is that it has to be left on charge when the car is not
in use.


Posted by Rob on September 9, 2008, 1:56 am
 On Sep 8, 5:52pm, maur...@tpg.com.au (Mauried) wrote:

When coupled with a solar charger it mitigates some of the discharge
loss. Thanks for sharing the information.
Rob

Posted by Mauried on September 9, 2008, 4:07 am
 wrote:


Its nothing to do with discharge loss, and everything to do with
keeping the internal temperature of the battery at 270C due to the
characteristics of the batterys electrolyte which is Sodium Aluminium
tetrachloride.

If the battery cools down, it ceases to function until it is heated up
again.



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