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Peter,<br>
The specific answer to your question from the manufacturer starts
with the fourth paragraph on page 19, Section 5.4 "Charging" of the
SunXtender Technical Manual, available at
<a class="moz-txt-link-freetext" href="http://www.sunxtender.com/pdfs/Sun_Xtender_Battery_Technical_Manual.pdf">http://www.sunxtender.com/pdfs/Sun_Xtender_Battery_Technical_Manual.pdf</a>.<br>
<br>
Concorde recommends a minimum "for repetitive deep cycling" of C/5,
or 41A at 24Vnom for your pair, and a maximum inrush of C/0.2
(1,040A !)<br>
<br>
Allan<br>
<br>
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<p class="MsoNormal" style=""><span class="il"><b style="">Allan</b></span><b
style=""> Sindelar</b><span style="font-size: 10pt;"><br>
<a href="mailto:Allan@positiveenergysolar.com"
target="_blank"><span class="il">Allan</span>@positiveenergysolar.com</a><br>
NABCEP Certified Photovoltaic Installer<br>
EE98J Journeyman Electrician<br>
<b style="">Positive Energy, Inc.</b><br>
3201 Calle Marie<br>
Santa Fe, New Mexico 87507<br>
<b style="">505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span></p>
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<br>
On 2/27/2011 1:35 PM, Peter Parrish wrote:
<blockquote cite="mid:33442DFE9675472BAA6A7F728C3B024F@Angeles"
type="cite">
<pre wrap="">
We have a portable "demo-off grid" system (24 Vdc, 120 Vac, 1kW-ac) and
occasionally we end the day with a fairly deep discharge 11.6-11.7 V (80%
DoD).
I like to get a deeply discharged battery back up to 100% capacity as soon
as possible (as opposed to letting the 850 W PV / charge controller system
charge it up over a several days) and I have a AC battery chargers with
"20A', "10A" and "2A" bulk settings along with being able to choose, "wet",
"gel" and "AGM" settings.
Our battery of choice is a SunXtender AGM battery (PVX-2120L, 12V 253 amp-hr
(C/120).
My question: Starting with this battery at say 11.6 volts (open circuit), is
it safe to begin the bulk charge at ~8% of its C/120 capacity (i.e. 20A),
and let the charger go into absorption at 14.4 V (with temperature
correction of course) and finish at 2A? How high could I safely start the
bulk charge?
Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP Cert. 031806-26
<a class="moz-txt-link-abbreviated" href="mailto:peter.parrish@calsolareng.com">peter.parrish@calsolareng.com</a>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
</pre>
</blockquote>
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