Test data is important. If you check out most Li battery brands, they copy each
other: “2000 cycles with 80% remaining.” Like Clara Peller said in 1984, “
Where’s the beef?”
One brand of Li battery that we sell, LiFeBlue, has published actual test data
for their cells (Topband). At 1C rate and 100% DoD, they produced over 2800
cycles and had 83% remaining capacity. Extrapolate to 8000 cycles and that
would mean 48.5% remaining capacity if degradation remained linear. However,
we are in fantasy land here due to the unknown affects of battery aging on one
hand and the fact that no one will use a battery like that on the other.
Besides, in a decade or so, will Li-ion battery cost make lead batteries a
relic?
IMO, lead is dead…or at least dying…slowly.
Larry Crutcher
Starlight Solar Power Systems
On Feb 20, 2018, at 9:02 AM, Kirpal <[email protected]> wrote:
Larry....yes those are big claims (8000 cyclces at 100% DOD!) No I don't have
the data showing that, nor have I seen it. But the marketing has to be
accurate right?! We have installed a few systems with a few more on the books
including one at our office. Will be interesting to see if the real world
matches the lab tests....I don't have a copy of their warranty but it is for 15
years and does allow for some degradation of capacity, 70% remaining after 15
years. Pretty robust for a battery warranty! From what I have seen they are a
strong off grid option. Could be one of the last battery banks some of our
customers ever buy. The visibility into cycle count and remaining capacity is
refreshing after using various amp hour meters which tend to wander in accuracy
over time. I am looking forward to the migration away from Lead Acid in the
years ahead!
Sunny Regards,
Kirpal Khalsa
Oregon LRT#25
NABCEP Certified PV Installation Professional
Oregon Solarworks LLC
www.oregonsolarworks.com <http://www.oregonsolarworks.com/>
541-299-0402
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