[RE-wrenches] Xantrex C-40 Drifting

[Drake]

I was thinking of a Blue Sky or a Morning Star replacement.

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.

At 09:30 AM 5/15/2015, you wrote:
>HI Drake,
>
>Iv'e never seen this happen. Â
>But have you considered a small morningstar or similar?
>
>A question, you list 29.4v, that seems high?
>
>jay
>
>
>
>On Thu, May 14, 2015 at 5:12 PM, Drake 
><<mailto:drake.chamberlin at redwoodalliance.org>drake.chamberlin at redwoodalliance.org> 
>wrote:
>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.
>
>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.
>
>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.
>
>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.
>
>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?
>
>Thanks,
>
>Drake
>
>
>
>
>--
>Jay Peltz
>Peltz Power
><mailto:jay.peltz at gmail.com>jay.peltz at gmail.com
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