<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">Please be careful when working with
solar system size Lithium packs on the cell level.</font>
<br>
<br><font size=2 face="sans-serif">We have been doing on-going testing
with Lion battery packs from various suppliers and even with their built
in temp sensors and other BMS circuits, have already had two "thermal
events".</font>
<br>
<br><font size=2 face="sans-serif">Lion is very unforgiving with regards
low state of charge, high state of charge, temperature (110F is the max
temp at which they should be charged and 140F is the max they can handle).</font>
<br>
<br><font size=2 face="sans-serif">Given the low thermal mass of Lion cells,
a high rate of discharge or charge quickly gets the cell temperature into
the 110F+ range.</font>
<br>
<br><font size=2 face="sans-serif">As soon as you cross the line things
start happening and if the BMS doesn't put a stop to it by turning the
battery pack off, it's a very quick slide down the hill from there.</font>
<br>
<br><font size=2 face="sans-serif">JARMO<br>
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<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Larry <larry@starlightsolar.com></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">03/17/2015 11:41 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">[RE-wrenches] Load testing Lithium battery
bank</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><tt><font size=2>I am repairing and restoring a pair of poorly designed
lithium-ion <br>
battery bank that suffered over discharge, damaging many cells. After <br>
cell replacement I need to perform a discharge test with a 10kW load to
<br>
verify the remaining capacity. The battery voltage is 105 volts @ 100%
<br>
SoC and 89.6 volts @ 0%<br>
<br>
I would like advice on how I can create an economical 10kW load. Water
<br>
heating element? Wire wound resistors? Are there any GT inverters that
<br>
will operate at these voltages?<br>
<br>
Thanks.<br>
<br>
-- <br>
<br>
<br>
Larry Crutcher<br>
Starlight Solar Power Systems<br>
<br>
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