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Thank you Brian -- <br>
<br>
if what you say is correct that one would need 1/2 the battery energy
of the AGMs<br>
(and I have no reason to doubt you), at ~$2 cell, that make these
LiFePO4 very competitive.<br>
<br>
That puts it at 1.5x-2x the cost, with 1/5-1/6 the weight.<br>
<br>
Granted this is a manufacturer direct, Chineese supplier -- but still
very interesting.....<br>
<br>
<a href="http://www.fuzing.com/vli/0005509cd235/Li_ion-battery">http://www.fuzing.com/vli/0005509cd235/Li_ion-battery</a><br>
<br>
The same type of cell was tested here:<br>
<br>
<a href="http://zeva.com.au/tech/headway/">http://zeva.com.au/tech/headway/</a><br>
<br>
will continue to do some more homework,<br>
<br>
Mike<br>
<br>
<br>
Brian Lasseter wrote:
<blockquote
cite="mid:2b3d5a440807070157q10a9f75hcf0a1a473228bde3@mail.gmail.com"
type="cite">
<pre wrap="">On Mon, Jul 7, 2008 at 12:23 AM, Mike Seningen <a class="moz-txt-link-rfc2396E" href="mailto:mseningen@austin.rr.com"><mseningen@austin.rr.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">12v 20 Hr Rate AH = 100 -- so is this a 100AH battery at 12v -- or 1200AH at 12v?
Li-ion 3.7v @1.7AH -- to get 100AH @ 12v is roughly 190cells? (100/1.7)*(12/3.7)
</pre>
</blockquote>
<pre wrap=""><!---->
Volts X Amp_Hours = Watt_Hours
12V x 100AH = 1200wh of energy for your AGM.
3.7V x 1.7AH = 6.29wh of energy for your Li-ion cell.
Your final count of 190 li-ion cells would give you the same energy though.
However, just to confuse you more, the peukert exponent comes into
play here. Long story short... the li-ion cell can use nearly 100% of
it's energy, while the AGM cell will likely only be able to use 50% of
it's energy at the high rate of energy depletion used in electric cars
(depending on what it's peukert exponent is).
So... 95 li-ion cells should suffice to give you the same amount of
"useable" energy. If you know the peukert exponents for each battery,
then you could calculate an exact number.
<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Peukert%27s_law">http://en.wikipedia.org/wiki/Peukert%27s_law</a>
<a class="moz-txt-link-freetext" href="http://www.smartgauge.co.uk/peukert_depth.html">http://www.smartgauge.co.uk/peukert_depth.html</a>
--
TTFN,
Brian "Lasso" Lasseter
· (512)736-1677 · AIM:digininja · ICQ:2238123 · MSN:azoreg ·
"No Sane man will dance." -Cicero (106-43 B.C.)
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</pre>
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