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<DIV>This is good stuff, enlightening...but begs another small? detail that has
obvious big ramifications. Where o where does the BTS get placed to best
read the actual "temperature of the battery"? It's too big to fit on many
terminals especially once cabled, it's certainly not very accurate when stuck to
the outer case of a dual cased Surrette and probably only somewhat more accurate
when stuck to an L-16 top. Aren't we looking for electrolyte temps?
</DIV>
<DIV> </DIV>
<DIV> Many times the BTS doesn't survive
its original location after a few years of battery acid. Rather than
"insulated" from the surface its been assigned to with 2-sided tape, it
seems like it should be in direct contact with that surface with a dab of
thermal grease between. Or, couldn't a wrench be trusted to drill a
1/4" hole in the top of a representative cell and insert an acid proof sensor
into the electrolyte with a formed snap-in plug (rubber, silicone,
nylon??) behind it on the lead, to seal it where it enters the battery
case?</DIV>
<DIV> </DIV>
<DIV> Just saying, if we really need (and I
think we do) accurate battery temp for temp regulation and battery health, what
we're using now is substandard.</DIV>
<DIV> </DIV>
<DIV>Bill</DIV>
<DIV>Feather River Solar Electric</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=ray@solarray.com href="mailto:ray@solarray.com">Ray Walters</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=re-wrenches@lists.re-wrenches.org
href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, May 22, 2015 3:33 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [RE-wrenches] FLA battery
setpoints with larger arrays</DIV>
<DIV><BR></DIV>I thought I'd post some info on Battery Temp from a few
manus:<BR>HUP Solar One: do not exceed 105 F<BR>Full River AGMs: max
recommended operating temp 104F<BR>and from Trojan: for every 10C
increase in temperature the reaction rate doubles. Thus, a month of
operation at 35C is equivalent to 2 months at 25C. Heat is the enemy of
ALL lead acid batteries. Even small increases in temperature will have a
major influence on battery life.<BR>Their T105 RE battery has a max operating
temperature of 113 F<BR><BR>I think more batteries are hitting high
temperatures than we may realize. This info from Trojan that a battery
at 95F (35C) will only last half its rated life (at 25C) is very
concerning.<BR>Once again, thanks Bob and Midnite for giving us a tool to
combat over temperature of batteries. We always knew cold was a problem,
now I'm realizing heat could be just as important.<BR><PRE class=moz-signature cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</PRE>
<DIV class=moz-cite-prefix>On 5/22/2015 3:24 PM, <A
class=moz-txt-link-abbreviated
href="mailto:boB@midnitesolar.com">boB@midnitesolar.com</A> wrote:<BR></DIV>
<BLOCKQUOTE cite=mid:555F9E8E.60200@midnitesolar.com type="cite">I'm very
glad to hear Midnite added the high temp disconnect to their system.
They may have saved a life.<BR>
<BLOCKQUOTE cite=mid:555F89DE.6000302@solarray.com type="cite">Bob, is
battery temp logged, so we could see how often a system quits charging for
high temp, and just what the battery temps are
running?</BLOCKQUOTE><BR><BR>No, but that is on the list as are other things
to data log.<BR><BR>Hopefully the temperature is adjusted higher than it
would ever get to under normal circumstances.<BR><BR>I could see some future
systems wanting to be able to regulate Absorb on battery temperature mixed
with other<BR>parameters some day. Could get REALLY complicated
if you wanted to. We're learning more and more<BR>about what is good
for batteries.<BR><BR>boB<BR><BR><BR></BLOCKQUOTE><BR>
<P>
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