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Recharging the Grid with Electric Cars - Page 4

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Posted by Bill Carter on March 27, 2009, 4:34 am
You wrote:

That's real easy to figure out if you just think about it for a
minute. Obviously you didn't do that. Millions of cars attached
to the grid represents a significant energy repository. Perhaps
they would drain a quarter of that power at night when the solar
generators aren't running leaving you plenty to get to work. Or
YOU decide how much power you are willing to allocate and the larger
the percentage of risk you take the more they pay you.

Sounds like you just don't want it to work. Several kinds of batteries
charge quickly, most likely you will have 100% within an hour and you
tell them they can't take more than 25%.

Posted by Eeyore on March 26, 2009, 10:18 pm

harry wrote:

And if that was economic they'd be doing it already without modifying EVs to
provide the batteries.

You do realise battery life is affected by the number of cycles of use and the
depth of discharge on each cycle I hope. All of which will be made worse by such


Posted by Eeyore on March 27, 2009, 7:57 pm

Bill Carter wrote:

The life of ALL batteries is affected by numbers of cycles of use and the depth
of discharge ( using most of their capacity makes their life shorter ).

Any scheme using EV batteries to form an 'energy repository' will simply degrade
the lifetime and ability to hold charge of those VERY expensive batteries. The
very idea is daft from the beginning since it's difficult enough as it is to get
enough capacity from an EV battery. Forget it. It won't happen.


Posted by Bill Carter on March 28, 2009, 11:21 pm
 Eeyore wrote:

That's why you don't use most of their capacity.



All technologies are daft from the beginning, then later it makes all the
sense in the world. Battery technology is following a well-tread development
curve. I don't advocate that batteries currently in use are suitable for
large-scale energy storage and retrieval but I think it will be feasible
within 5 years.

Posted by Eeyore on March 28, 2009, 10:22 pm

Bill Carter wrote:


Which means extra expense.




NO. Some are clearly great from the beginning ( such as the jet engine ) and
are non-starters. You obviously have no experience of this area.

No it isn't. Today's lead-acid battery is little different from one made 100

Where did you pull 5 years out of your backside and do tell us what technology is
going to do it.


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