HI Drake, Iv'e never seen this happen. 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 <[email protected] > 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 [email protected]
_______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
