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<div class="moz-cite-prefix">On 8/2/2012 1:06 PM, Drake wrote:<br>
</div>
<blockquote
cite="mid:20120802200606.8871C282061@homiemail-a82.g.dreamhost.com"
type="cite">
<br>
Hello Wrenches,<br>
<br>
Thanks for your help with this question.<br>
<br>
I've had a breakthrough on the design of this system. I talked
with
Tom at Midnight Solar, and he explained that Concord batteries can
be
charged at C X 5 if necessary, i.e., 5 X AH capacity of the bank.
The batteries like a fast charge. They are a bit spendy, but will
simplify the overall system design. <br>
<br>
From the Manual: <br>
"The charging current during the Bulk stage should be set as high
as
practical; higher current mean faster recharge time. For
repetitive
deep cycling, chargers should have an output current of at least
0.2C (20
Amps for a 100 Ah battery). If the output current is less than
this
value, the cycle life of the battery may be negatively affected.
Due to low impedance design, Sun Xtender batteries can tolerate
in-rush
current levels as high as 5C (500 A for a 100 Ah battery). "
<br>
<br>
It is imperative to keep the system voltage at the required set
point. The CC regulation will prevent the batteries from being
harmed, as the voltage will rise quickly.<br>
<br>
Drake <br>
<br>
<a moz-do-not-send="true" name="_MailAutoSig"></a>Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV Installer<br>
740-448-7328<br>
</i><a moz-do-not-send="true" href="http://athens-electric.com/">http://athens-electric.com/</a>
<br>
<br>
<br>
<br>
<br>
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<font face="Arial Narrow">Just a word of caution on the AGM
batteries. AGM's do have some vulnerabilities compared to deep
cycle wet filled batteries. We had a bank of 20, 8A8D </font>running
a Buddhist Retreat compound and were unable to convince our clients
that there were limitations to the amount of power that they could
run at one time. They managed to overheat and destroy the whole bank
of batteries we think by using too much power during a retreat camp.
People had brought there own appliances to use at the camp and we
still don't know what the total load was on the 4, Outback VFX 3648
inverters. I'm guessing it was up there close to the 14.4 kW limit
of the Outback inverters. We also petitioned our client for a larger
battery bank but they didn't think they would ever need that much
power. <br>
<br>
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