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Bob is correct, I do have an off grid client that uses an AC unit to
keep the batteries cool.<br>
Although we're not in a high temp climate, it does get into the 80's
and low 90's here<br>
in the summer. <br>
<br>
By my calculations, he was losing an 'average' of 10% storage
capacity during the 5 month<br>
period from late spring to early fall. In July and August it was
closer to 18%, but for calculation<br>
purposes, 10% is close enough. His bank capacity is 4800AH @ 48 VDC.
That's 230,400 watt hours <br>
and 10% of that rounds out to 23,000 watt hours lost to heat. <br>
<br>
I showed up one day to check something in the power shed and was
dismayed to see a window <br>
AC unit installed there. An interesting customer discussion ensued
and I had to admit he was <br>
correct in his calculations.<br>
<br>
The Energy Star rated AC unit consumes no more than 3,000 watt hours
per day, even in the<br>
highest heat. Essentially, he's 'spending" 3 kilowatt hours to 'buy
back' 20 kilowatt hours of<br>
storage. He got me on that one!<br>
<br>
That reasoning didn't work on the 6 other AC units that appeared on
his house the following<br>
week. But that's another story altogether!<br>
<pre class="moz-signature" cols="72">Roy Butler
NABCEP Certified Solar PV Installer®
NYSERDA eligible PV & wind installer
PA Sunshine Program Approved PV Installer
Four Winds Renewable Energy, LLC
8902 Route 46
Arkport, NY 14807
607-324-9747
<a class="moz-txt-link-abbreviated" href="http://www.four-winds-energy.com">www.four-winds-energy.com</a>
Although no trees were killed in the sending of this message,
a large number of electrons were terribly inconvenienced.
</pre>
<br>
On 4/22/2011 7:40 AM, bob ellison wrote:
<blockquote cite="mid:00a801cc00e2$cb09d590$611d80b0$@com"
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<p class="MsoNormal"><font size="4" color="black" face="Calibri"><span
style="font-size: 14pt; font-family:
"Calibri","sans-serif"; color: black;">I
believe Roy has a customer with a huge battery bank that
air conditioned the battery room. He ran the numbers and
the air conditioning actually made sense.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="4" color="black" face="Calibri"><span
style="font-size: 14pt; font-family:
"Calibri","sans-serif"; color: black;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="4" color="black" face="Calibri"><span
style="font-size: 14pt; font-family:
"Calibri","sans-serif"; color: black;">Bob
Ellison<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="4" color="black" face="Calibri"><span
style="font-size: 14pt; font-family:
"Calibri","sans-serif"; color: black;"><o:p> </o:p></span></font></p>
<div>
<div style="border-right: medium none; border-width: 1pt
medium medium; border-style: solid none none; border-color:
rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;
padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";
font-weight: bold;">From:</span></font></b><font
size="2" face="Tahoma"><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b><span
style="font-weight: bold;">On Behalf Of </span></b>R
Ray Walters<br>
<b><span style="font-weight: bold;">Sent:</span></b>
Thursday, April 21, 2011 4:50 PM<br>
<b><span style="font-weight: bold;">To:</span></b>
RE-wrenches<br>
<b><span style="font-weight: bold;">Subject:</span></b>
Re: [RE-wrenches] Air conditioning for batteies in
high temperature climate<o:p></o:p></span></font></p>
</div>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">Are you using temperature
compensation? It lowers the voltage when its hot.<o:p></o:p></span></font></p>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">Also, have you considered
setting the batteries in a below ground vault? I've had
good luck with in floor battery boxes.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">Finally, AGMs and L16s just
don't last very long anyway. AGMs maybe 3 years, and
L16s I've seen die in under 5 years and we get to 15
below zero.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">My suggestion: temp comp,
ground vault, HUP or equivalent cycle life.<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<div>
<div>
<p class="MsoNormal"><font size="1" color="black"
face="Helvetica"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;">R. Walters<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="1" color="black"
face="Helvetica"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><a moz-do-not-send="true"
href="mailto:ray@solarray.com">ray@solarray.com</a><o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="1" color="black"
face="Helvetica"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;">Solar Engineer<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="1" color="black"
face="Helvetica"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><o:p> </o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="1" color="black"
face="Helvetica"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><o:p> </o:p></span></font></p>
</div>
<p class="MsoNormal"><font size="1" color="black"
face="Helvetica"><span style="font-size: 9pt;
font-family:
"Helvetica","sans-serif"; color:
black;"><br>
<br>
</span></font><o:p></o:p></p>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;">On Apr 21, 2011, at 1:22
PM, Starlight Solar, Larry Crutcher wrote:<o:p></o:p></span></font></p>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span
style="font-size: 12pt;"><br>
<br>
<o:p></o:p></span></font></p>
<div>
<div>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family:
"Arial","sans-serif";">Hello
Battery Wrenches,</span></font><font size="4"
face="Helvetica"><span style="font-size: 13.5pt;
font-family:
"Helvetica","sans-serif";"><o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="4" face="Helvetica"><span
style="font-size: 13.5pt; font-family:
"Helvetica","sans-serif";"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="2" face="Arial"><span
style="font-size: 10pt; font-family:
"Arial","sans-serif";">Over
the years I have had several battery banks in Baja
and Sonora Mexico fail in just 36 to 48 months.
These have been L16 or 8D AGM or flooded banks, 24
and 48 volt systems. The charging systems are
working properly and programmed to manufacturer
recommended set points and discharges are
rarely over 30% DoD. Some batteries are only used
on weekends, some are discharged daily. I believe
what is affecting the short life is the high
temperature they live in for 5 months each year.
Temps. can hit 115 F in vented battery rooms. I
have been thinking about a small air conditioner
and insulated battery box to keep the battery at
no more than 80 F. There are some portable units
that draw about 600 watts and the run time would
be very little with a highly insulated enclosure.
There is ample power to do this on the home I am
changing batteries in now. Has anyone done this
and gained longer battery life?</span></font><font
size="4" face="Helvetica"><span style="font-size:
13.5pt; font-family:
"Helvetica","sans-serif";"><o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="4" face="Helvetica"><span
style="font-size: 13.5pt; font-family:
"Helvetica","sans-serif";"> <o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="2" face="Verdana"><span
style="font-size: 10pt; font-family:
"Verdana","sans-serif";">Best
Regards,</span></font><font size="4"
face="Helvetica"><span style="font-size: 13.5pt;
font-family:
"Helvetica","sans-serif";"><o:p></o:p></span></font></p>
</div>
<div>
<p><font size="2" face="Verdana"><span style="font-size:
10pt; font-family:
"Verdana","sans-serif";">Larry
Crutcher<br>
<a moz-do-not-send="true"
href="http://www.starlightsolar.com/">Starlight
Solar Power Systems</a><br>
</span></font><font size="1" face="Georgia"><span
style="font-size: 7.5pt; font-family:
"Georgia","serif";"><br>
<em><i><font color="red" face="Georgia"><span
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