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<div class="moz-cite-prefix">On 5/22/2015 6:43 PM, jay peltz wrote:<br>
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cite="mid:CAGr8+7e5y+kc-_ifUpvCgHJGe9cCFEqLbHyEi5dGJeZbKk+ZFQ@mail.gmail.com"
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<div dir="ltr">agreed.
<div>Again, maybe Steve has an view of the builder, but having
it on the post is pretty close.</div>
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<br>
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<br>
If it's the typical flat type of BTS, wedged right between two
batteries will give a good<br>
average temperature of the two of them.<br>
<br>
boB<br>
<br>
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<div>Maybe there is a white paper on temp sensor locations
pros/cons?</div>
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<div>jay</div>
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<div class="gmail_quote">On Fri, May 22, 2015 at 5:08 PM,
frenergy <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:frenergy@psln.com" target="_blank">frenergy@psln.com</a>></span>
wrote:<br>
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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>
<span class="">
<div> </div>
<div>Bill</div>
<div>Feather River Solar Electric</div>
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<div style="FONT:10pt arial">----- Original Message
----- </div>
<div style="BACKGROUND:#e4e4e4;FONT:10pt arial"><b>From:</b>
<a moz-do-not-send="true" title="ray@solarray.com"
href="mailto:ray@solarray.com" target="_blank">Ray
Walters</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a
moz-do-not-send="true"
title="re-wrenches@lists.re-wrenches.org"
href="mailto:re-wrenches@lists.re-wrenches.org"
target="_blank">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>
</span>
<div>
<div class="h5">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 cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar De</pre>
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-- <br>
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<div>Jay Peltz<br>
Peltz Power<br>
<a moz-do-not-send="true"
href="mailto:jay.peltz@gmail.com" target="_blank">jay.peltz@gmail.com</a></div>
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