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
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV
740-448-7328
<http://athens-electric.com/>http://athens-electric.com/
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