The internal resistance of a battery does not change it's Ahr
capacity. Not even a tiny amount. (If the is very large, it may
change how you pick when 100% DOD is reached, however.)
The same number of amps will flow. The voltage will depend upon the
internal resistance, but not the Ahrs.
Li-ion really has a tiny Puekert effect, so you put 1.0 in the E-meter.
The Peukert effect is caused by the diffusion time constant of the
reactants. Very long time diffusion paths and time constants in
lead-acid. Very very short diffusion time constants in Li-Ion. No
thick layer of lead-sulphate to put on or take off.
For example, if you have severely discharged lead-acid, you can wait
several minutes and the voltage will slowly rise and you can drive a
bit more. This doesn't happen with li-ion. When you are out, you are
out, and waiting won't help.
Bill D.
At 10:45 AM 5/7/2014, you wrote:
Pestka, Dennis J wrote:
I just completed a Lithium installation on my 65 Datsun.
I'm resetting the parameters on my Link-10 E-Meter, and was curious
what Puekert Exponent people were using.
Based on what I've read, I was tempted to use 1.00, but wasn't sure
if this was right.
Have (50) 180 ah CALB CA series cells, nominal 160V, 28.8 Kw pack.
It's definitely not 1.0. Any battery with an internal resistance
greater than zero will have a Peukert exponent greater than 1.
Your best bet is to use the Link-10 to measure the actual capacity
of the pack at two different rates of discharge. There's an equation
in the manual to calculate the Peukert exponent from that data.
--
Ring the bells that still can ring
Forget your perfect offering
There is a crack in everything
That's how the light gets in.
-- Leonard Cohen, from "Anthem"
--
Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm
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