Hi Larry;
LFPs definitely have some internal resistance and therefore are subject
to Puekert's law, they just have an exponent that is closer to 1. Yes,
they also have a higher operating temperature, but it still has a limit.
My point is that if you develop software to better model FLA batteries,
the software could easily be adapted to other technologies by simply
inputting the appropriate Puekert's exponent, temp limit, etc. of that
particular battery.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 12/18/2015 8:44 AM, Starlight Solar Power Systems wrote:
On Dec 17, 2015, at 11:55 AM, Ray Walters <[email protected]> wrote:
...but as far as I can tell, every other storage chemistry has similar
characteristics: lower capacity at low temps, a high temp limit, non-linear
cycle life depending on DOD, Puekert's exponent relating capacity vs charge/
discharge rates, volt drop under hard discharge, etc.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
Exception: LFP batteries are not affected by Peukerts Law. Discharging at 3C or
.3C has little effect. Also, high temperature degradation rate quite a bit
lower than that of lead batteries.
Larry Crutcher
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