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Hi Steve,<br><br>
The battery bank consists of four, 415 AH in a Full River AGM deep cycle
batteries wired in a 24 volt series.<br><br>
That is a new concept to me. Does the battery bank charge itself through
its own chemical reaction? Would there be any issues with gassing in the
VRLA batteries? Would you recommend doing anything about this situation,
like change charge controllers? <br><br>
Thanks,<br><br>
Drake <br><br>
<a name="_MailAutoSig"></a>Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328<br>
</i><a href="http://athens-electric.com/">http://athens-electric.com/</a>
<br><br>
<br>
At 07:10 PM 5/18/2015, you wrote:<br>
<blockquote type=cite class=cite cite="">Content-Language: en-US<br>
Content-Type: multipart/related;<br>
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boundary="_004_414D424906AE60489EF1829E1EFA55712C9C56F2sbcexchsbcdomai_";<br>
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Hey Drake, <br>
<br>
How large is the battery bank?<br><br>
I’ve seen this before on VRLA’s with a couple of companies controllers.
Usually this will happen with small battery banks. <br>
<br>
Best way to explain it is when the battery bank is charging and you
remove the charge, the battery is a chemical reaction… it’s still
charging for a short period of time even though you have removed the
source. <br>
<br>
<br>
<br><br>
<font face="Tahoma"><b>Steve Higgins<br>
Technical Services Manager<br>
</b>P: +1.902.597.4020<br>
M: +1.206.790.5840<br>
F: +1.902.597.8447<br>
</font><font face="Tahoma" color="#D30000"><b>Surrette Battery
Company</font><font face="Tahoma" color="#FF0000"><br>
</b></font><font face="Tahoma">Exclusive manufacturer of<br>
<a href="http://www.rollsbattery.com">
<img src="cid:7.1.0.9.0.20150518195209.05ac2a68@redwoodalliance.org.1" width=160 height=84 alt="[]">
</a></font><br><br>
<b>From:</b> RE-wrenches
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" eudora="autourl">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of
</b>Drake<br>
<b>Sent:</b> Friday, May 15, 2015 7:10 AM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Xantrex C-40 Drifting<br>
<br>
I was thinking of a Blue Sky or a Morning Star replacement. <br><br>
The Full River AGM L-16 batteries recommend a 29.4 absorption, very high
for a maintenance free battery. I've triple checked this one.<br><br>
At 09:30 AM 5/15/2015, you wrote:<br><br>
HI Drake,<br><br>
Iv'e never seen this happen. Â <br>
But have you considered a small morningstar or similar?<br><br>
A question, you list 29.4v, that seems high?<br><br>
jay<br><br>
<br><br>
On Thu, May 14, 2015 at 5:12 PM, Drake
<<a href="mailto:drake.chamberlin@redwoodalliance.org">
drake.chamberlin@redwoodalliance.org</a>> wrote:<br>
I have a Xantrex C-40 that won't keep its settings. It is important that
it does because it is for a maintainer array (80 W) on an AGM battery
bank, on an AC coupled backup system. Not only could high voltage damage
the batteries, but when the voltage goes over 30 Volts, the AUX relay
opens and the grid tie inverter is isolated from the grid.<br>
After numerous sessions of reprogramming, Xantrex tech support sent me a
new unit. The problem persisted as before. A new temperature sensor
helped, but the settings still drift. It seems that rebooting the charge
controller helps for a day or so, but then it drifts again.<br>
The potentiometer settings are way below the calculated setting for 29.4
V, but it still peaks in the high 30s. I check the temperature
compensated voltages on the Outback Mate, and the temp compensated
voltage runs high. <br>
In a related side issue, the AUX relay of the FX inverters is not based
on temperature compensated voltage, which makes setting AC coupling
charge set points more problematic. <br>
Has anyone experienced a C-40 CC that drifts in its settings. What would
be a good (inexpensive) charge controller to accurately control 80 W of
PV?<br>
Thanks,<br>
Drake <br><br>
<br><br>
-- <br>
Jay Peltz<br>
Peltz Power<br>
<a href="mailto:jay.peltz@gmail.com">jay.peltz@gmail.com</a><br>
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