<!doctype html public "-//W3C//DTD W3 HTML//EN">
<html><head><style type="text/css"><!--
blockquote, dl, ul, ol, li { padding-top: 0 ; padding-bottom: 0 }
--></style><title>Re: [RE-wrenches] discharging Rolls
batteries</title></head><body>
<div>Hi Jamie and Dan,</div>
<div><br></div>
<div>Thanks for keeping up this thread! And sorry for being
impatient.</div>
<div><br></div>
<div>Now, if the capacity 'loss' is simply due to reduced performance,
is it logical to say that one can push the battery to lower voltages
under low temperature conditions without actually cycling it harder or
reducign its life that way?</div>
<div><br></div>
<div>On the question of inverter temperature compensation for
discharge set points, these would surely be adjusted downward in low
temperatures whereas the charging setpoints are adjusted upwards.
I had never heard of such adjustment to discharge setpoints (low
battery disconnect, genstart, etc). I would be interested to
know if this type of temperature compensation exists and indeed
whether it is legitimate in terms of sustainable battery
management.</div>
<div><br></div>
<div>Hugh</div>
<div><br></div>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font
face="Lucida Grande">Hugh,</font><br>
</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">Sorry if you
found my response limited but have been traveling since early this am
and don't have all information at hand, at the moment.</font><br>
</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">Regarding
temperature effects on capacity, earlier responses are spot on as the
lower capacity is totally as a result of slower reaction times as a
result of lower temperatures. </font><br>
</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">Approximate
Temp effects;</font><br>
</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">40C =
104%</font><br>
</blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">25C =
100%</font><br>
</blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">5 to 10C =
90%</font><br>
</blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">-5C =
80%</font><br>
</blockquote>
<blockquote type="cite" cite><font face="Lucida Grande">-22C =
60%</font></blockquote>
<div><br></div>
<x-sigsep><pre>--
</pre></x-sigsep>
<div>Hugh Piggott<br>
<br>
Scoraig Wind Electric<br>
Scotland<br>
http://www.scoraigwind.co.uk</div>
</body>
</html>