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I will look into the charger as well as the battery pak electronics too.<br>
<br>
I just want to make sure my numbers are correct -- and that I am not
deluding<br>
myself into thinking it maybe more economical than is reality.<br>
<br>
thanks<br>
<br>
mike<br>
<br>
<br>
Rob H wrote:
<blockquote
cite="mid:ba1af3270807070618q360ea772sa69941709fe11ef4@mail.gmail.com"
type="cite">This is great! It's nice to have a better info than the
rule of thumb that I'd been working on.<br>
<br>
Please be sure we factor in the costs of the charging system.<br>
<br>
<div class="gmail_quote">On Mon, Jul 7, 2008 at 7:42 AM, Mike
Seningen <<a moz-do-not-send="true"
href="mailto:mseningen@austin.rr.com">mseningen@austin.rr.com</a>>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000">
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 moz-do-not-send="true"
href="http://www.fuzing.com/vli/0005509cd235/Li_ion-battery"
target="_blank">http://www.fuzing.com/vli/0005509cd235/Li_ion-battery</a><br>
<br>
The same type of cell was tested here:<br>
<br>
<a moz-do-not-send="true" href="http://zeva.com.au/tech/headway/"
target="_blank">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 type="cite">
<div>
<div class="Wj3C7c">
<pre>On Mon, Jul 7, 2008 at 12:23 AM, Mike Seningen <a
moz-do-not-send="true" href="mailto:mseningen@austin.rr.com"
target="_blank"><mseningen@austin.rr.com></a> wrote:
</pre>
<blockquote type="cite">
<pre>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>
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<pre><div><div class="Wj3C7c">
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 moz-do-not-send="true"
href="http://en.wikipedia.org/wiki/Peukert%27s_law" target="_blank">http://en.wikipedia.org/wiki/Peukert%27s_law</a>
<a moz-do-not-send="true"
href="http://www.smartgauge.co.uk/peukert_depth.html" target="_blank">http://www.smartgauge.co.uk/peukert_depth.html</a></div></div>
--
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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-- <br>
Rob<br>
____________<br>
Rob Hirschfeld
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