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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>
<blockquote type=cite class=cite cite="">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>
<dl>
<dd>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><br>
<dd>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><br>
<dd>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><br>
<dd>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><br>
<dd>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><br>
<dd>Thanks,<br><br>
<dd>Drake <br><br>
</dl><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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