On 8/2/2012 1:06 PM, Drake wrote:
Hello Wrenches,
Thanks for your help with this question.
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.
From the Manual:
"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). "
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.
Drake
Drake Chamberlin
/Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV Installer
740-448-7328
/http://athens-electric.com/
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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 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.
--
--
*Vince McClellan
Energy Design
_www.solarenergydesign.com <http://www.solarenergydesign.com/>_
p: 541.485.8122; f: 541.338.3168*
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